Manuale d’uso / di manutenzione del prodotto 59551A del fabbricante Symmetricom
Vai alla pagina of 262
097-585 03-13 Issue 2: Jul 00 Copyright © 2000 Symmetricom, Inc. All rights reserved. Printed in U.S.A. 58503B GPS Time and F requency Ref erence Receiv er and 59551A GPS Measurements Synchronization.
This gu ide describes h ow to operate t he Symmetri- com 58503B G PS Time an d Freq uency Referen ce Re- ceiver an d 59551A GPS Measur ements Synchr onizatio n Module via th e RS-232C port (s).
Contents Operating and Programming Gu ide iii In This Guide 1 Front and Rear P anels at a Glance 58503B Front Panel at a Glance 2 58503B/Opti on 001 Front-Panel Display/Keypad at a Glance 3 58503B Rea.
Contents iv Operating an d Programming Guide Reference Output s 13 ACQUISITION Section of the Status Scre en 14 ACQUISITION Line 14 Tracking, Not Tracking 14 Time 16 Position 17 HEALTH MONITOR Section.
Contents Operating and Programming Guide v GPS Satellite Acquisition 7 1 PPS Refere nce Synchronization 27 Operating Status 39 System Time 73 Programmabl e Pulse Output (5 9551A Only) 83 Event Ti me S.
Contents vi Operating an d Programming Guide Using Multiple Commands 7 Program Messages 7 Program Message Syntax 7 Elements of Response Mess ages 9 Respo nse Messages 9 Response Message Syntax 9 Respo.
Contents Operating and Programming Gu ide vii Specific ations Tested 22 Procedure 22 Test 3: 1 PPS Ti m e Accuracy (Locked) 24 Test 4: 10 MHz Frequency Stability ( Time Domain) and Phase Noise (Freque.
Contents viii Operating an d Programming Guide.
Operating and Programming Guide ix In This Guide Chapter 1 , “ Front and Rear Panels at a Glan ce ,” provides overview of the Rec eiv er’s in di cato rs, i nput s, an d outp uts . Chapter 2, “ Serial Interface Capabilities ,” provides RS-232 se rial interface port connect ion and configuration instructio ns .
In This Guide x Operating and Programming Gui de Appendix E, “ 58503B Spe cifications ,” l is ts the product spe cifications and charac teristics. Appendix F, “ 59 551A Specification s ,” lists the product specificat ions and charac teristics.
1 Front and Rear Panel s at a Gl ance.
Chapter 1 Front and Rear Panels at a Glance 58503B Front Panel at a Glance 1-2 Operating an d Programming Guide 58503B Front Panel at a Glance 1 When the Power indicat or illumin ates, it indicates that the proper input power is suppl ied to the Receiver.
Chapter 1 Front and Rear Panels at a Glance 58503B/Option 001 F ront-Panel Display/Keypad at a Glance Operating and Programming Guide 1-3 58503B/Opt ion 001 Front-Panel Displa y/Keypad at a Glanc e 1 An alphanumeric disp lay for displa ying time, posit ion (i.
Chapter 1 Front and Rear Panels at a Glance 58503B Rear Panel at a Glance 1-4 Operating an d Programming Guide 58503B Rear Panel at a Glanc e 1 ANT N- type (female) conne ctor for GPS Antenna connectio n.
Chapter 1 Front and Rear Panels at a Glance 59551A Front Panel at a Glance Operating and Programming Guide 1-5 59551A Front Panel at a Glance 1 When t he Power indicat o r illumin ates, it indicates that the proper input power is supplied to the Mod ule.
Chapter 1 Front and Rear Panels at a Glance 59551A Rear Panel at a Glance 1-6 Operating an d Programming Guide 59551A Rear Panel at a Glanc e 1 1P P S (One-Pulse-P er-Second) connector for out put ting a continuous one pulse per second sign al. 2 Programma ble Pulse output conn ector for ou tputti ng pulses at user-s pecified time/period.
2 Serial Interf ace Capabilities.
Chapter 2 Serial Interface Capabilities Chapter Contents 2-2 Operating an d Programming Guide Chapter Contents This chapter describes how to operate the 5955 1A GPS Measurements Synchroniz ation Module and the 58503B GPS Time and Frequency Reference Recei ver via the RS-232C serial interface po rt.
Chapter 2 Serial Interface Capabilities About the RS-232C Serial Port (s) Operating and Programming Guide 2-3 About the RS-232C Serial Port(s) The 58503B has only a rear-panel ( PORT 1 ) RS-232 C serial interface port. The 59551A has separate re ar-panel ( PORT 1 ) and f ront-panel ( PORT 2 ) RS-232C serial interface por ts.
Chapter 2 Serial Interface Capabilities About the RS-232C Serial Port (s) 2-4 Operating an d Programming Guide Refer to the sections titled “Conne cting a Computer or Modem” in t his chapter, on page 2-5, for wiring diagr am s and more info rm ation on the RS-232C interfac e cables.
Chapter 2 Serial Interface Capabilities Connecting a Computer or Modem Operating and Programming Guide 2-5 Connecting a Computer or Modem To connect the GPS Receiver to a comput er or modem, you must have the proper interf ace cable. Most computers are DTE (Data Terminal Equipment) devices.
Chapter 2 Serial Interface Capabilities Connecting a Computer or Modem 2-6 Operating an d Programming Guide To Connect the GPS Rec eiver to a PC or Mo dem Via the Rear-Panel PORT 1 Connecting to the P.
Chapter 2 Serial Interf ace Capabilities Connecting a Computer or Modem Operating and Programming Guide 2-7 Figure 2- 2 Connecting the GPS Receiver to a Modem HP 40242M or equivalent GPS Receiver (Rear view) Modem set to Auto-Answer Telephone Line WARNING: WARNING: NO OPERATOR SERVICEABLE PARTS INSIDE, REFER SERVICING TO SERVICE TRAINED PERSONNEL.
Chapter 2 Serial Interf ace Capabilities Connecting a Computer or Modem 2-8 Operating an d Programming Guide Making You r Own Cables If you choose to make your own cable, see Figure Figu re 2-3 and Figure Figure 2-4.
Chapter 2 Serial Interface Capabilit ies Configuring the RS-232C Port(s) Operating and Programming Guide 2-9 Configuring the RS-232C Port (s) The 59551A has separate re ar-panel ( PORT 1 ) and f ront-panel ( PORT 2 ) RS-232C serial interface por ts. The 58503B has one RS-232C serial interf ace port ( PORT 1 ) on the rear panel.
Chapter 2 Serial Interface Capabilities Configuring the RS-232C Port(s) 2-10 Operating an d Programming Guide Making Changes to the Se rial Port Settings (If Needed) CAUTION If you ch ange the seri al port set tings, yo ur changes will be stored i n the Re ceiver.
Chapter 2 Serial Interface Capabilities Configuring the RS-232C Port(s) Operating and Programming Gu ide 2-1 1 Determining the Serial Po rt Settings Standard 58503B a nd 59551A If you connect your PC, press R eturn, and do not get a scpi> promp t back from the Receiver, your Recei ver’s serial communication settings may have been modi fied.
Chapter 2 Serial Interface Capabilities Configuring the RS-232C Port(s) 2-12 Operating an d Programming Guide This page i ntentionally left blank..
3 Visual User Interface Using the Receiver Sta tus Screen.
Chapter 3 Visual User Interface Chapter Contents 3-2 Operating an d Programming Guide Chapter Contents This chapter pr ovides a tutorial section on how to use the Receiver Status Scr een, a comprehens.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) Operating and Programming Guide 3-3 Using and Reading the Visual User Interface (the Receiv.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) 3-4 Operating an d Programming Guide Figure 3-1. Receiv er Status Screen at Powerup The ACQUISITION area of the screen is telling you that no satell ites have been tracked.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) Operating and Programming Guide 3-5 You can now see that the Re ceiver is tracki ng several satellite s as shown in Fi gure 3-2. The process of acquiring and t racking satellites is describe d in the fol lowing paragraphs.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) 3-6 Operating an d Programming Guide Also, you can see the initi al (estimated) p os ition has been replaced with a computed posit ion, which the Receiver continuous to refine until it gets a very accurate posi tion.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) Operating and Programming Guide 3-7 Figure 3-3.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) 3-8 Operating an d Programming Guide Also indicate d is a predict ion of the accuracy of the Receiver sho uld it go into hol dover operation.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) Operating and Programming Guide 3-9 Figure 3-4.
Chapter 3 Visual User Interface Using and Readi ng the Vi sual User Interfac e (the Receiver Stat us Screen) 3-10 Operating an d Programming Guide When the GPS antenna is re-co nnected and the GPS signal has been re-acquire d, the Receiver has the ability to recover from holdo ver by itself.
Chapter 3 Visual User Interface Receiver Status Screen Data Operating and Programming Gu ide 3-1 1 Receiver Status Screen Data This section define s the data displayed in the Receiver Status Scr een, shown in Figur e 3-6.
Chapter 3 Visual User Interface Receiver Status Screen Dat a 3-12 Operating an d Programming Guide SYNCHRONIZATI ON Section of the Status S creen SYNCHRONIZAT ION Summ ary Line The SYNCHR ONIZA TION line in the screen summarize s the Smar tCloc k Status and Reference Outputs .
Chapter 3 Visual User Interface Receiver Status Screen Data Operating and Programming Guide 3-13 When t he manua lly initia ted message follows the Hol dover label, the Receiver has been plac ed in holdover by the user. An explicit command is requir ed to initiate an exit from manual holdover.
Chapter 3 Visual User Interface Receiver Status Screen Dat a 3-14 Operating an d Programming Guide FFOM (Frequency Figu re of M erit ) indicates the stab ility of the Receiver’s internal 10 MHz signal. The 10 MHz signal is controll ed by the SmartClock’s Phase-Lo cked Loop (PLL).
Chapter 3 Visual User Interface Receiver Status Screen Data Operating and Programming Guide 3-15 Health and status indicators in the tables are de fined as follows: The health and status indica tors in the Not T rac king table are describe d as follows: PRN indicates the pseudorando m noise code as signed to th e satellite .
Chapter 3 Visual User Interface Receiver Status Screen Dat a 3-16 Operating an d Programming Guide Time When you first power up the unit the time and dat e that is stored in the internal GPS Engine may not be the actual date. The actual time and date will be valid after one satellite has been tracked by the Receiver.
Chapter 3 Visual User Interface Receiver Status Screen Data Operating and Programming Guide 3-17 ANT DL Y (antenna delay) di splays the user-ente red value that is used to compens ate for the propagation del ay of the antenna cable.
Chapter 3 Visual User Interface Receiver Status Screen Dat a 3-18 Operating an d Programming Guide The possible advi sory messages that can be displayed when position mode is Surv e y are: Suspended: .
Chapter 3 Visual User Interface Receiver Status Screen Data Operating and Programming Guide 3-19 This Page Intentional ly Left Blank..
Chapter 3 Visual User Interface The Receiver Status Screen at a Glance 3-20 Operating an d Programming Guide The Receiver Status Screen at a Glance.
Chapter 3 Visual User Interface The Receiver Status Screen at a Glance Operating and Programming Guide 3-21 The Receiver Status Screen at a Glance (cont’d).
Chapter 3 Visual User Interface The Receiver Status Screen at a Glance 3-22 Operating an d Programming Guide.
4 Command Quick Reference.
Chapter 4 Command Quick Reference Chapter Contents 4-2 Operating an d Programming Guide Chapter Contents This chapter is a quick refere nce that summarizes the GPS Receiver commands which allow you to operate and program the Recei v er.
Chapter 4 Command Quick Reference Chapter Contents Operating and Programming Guide 4-3 • Sys tem T ime page 4- 10 – Identifying Time of Next 1 PPS Reference Edge page 4-10 – Reading Current Time.
Chapter 4 Command Quick Reference An Introduct ion to GPS Receiver Commands 4-4 Operating an d Programming Guide An Introduction to GPS Receiver Commands SCPI Conformance Infor mation The SCPI commands used in the GPS Receiver are in confor mance with the S CPI Standard Ve rsion 1994.
Chapter 4 Command Quick Reference GPS Satellite Acquisition Operating and Programming Guide 4-5 GPS Satellite Acquisiti on The fol lowing command s are pr ovided to facilitat e initial G PS sat ellite.
Chapter 4 Command Quick Reference GPS Satellite Acquisition 4-6 Operating an d Programming Guide Selecting Satellites <selec t> = IGNore or INCLude :GPS:SATell ite:TRACking:INCLude <PRN>, .
Chapter 4 Command Quick Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 4-7 1 PPS Reference Synchronization The foll owing commands are pro vided to monitor t he operating m.
Chapter 4 Command Quick Reference Operating St atus 4-8 Operating an d Programming Guide Oper ating Sta tus The foll owing commands ar e provided to obtai n Receiver sta t us in formation. There are s everal ways to obta in Receiver statu s using commands.
Chapter 4 Command Quick Reference Operating St atus Operating and Programming Guide 4-9 Reading and Qu al ifying Rec eiver Status <regi ster> = OPERation <register> = QUEStionable <regi.
Chapter 4 Command Quick Reference System T ime 4-10 Operating an d Programming Guide Syst em Time The foll owing commands ar e provided to allo w you to monitor and con trol the system date and time.
Chapter 4 Command Quick Reference Programmable Pulse Output (59551A Only) Operating and Programming Gu ide 4-1 1 Programmable Pulse Output (59551A Only) The foll owing commands ar e provided to allo w you to operate and co ntrol the programmabl e pulse output of t he 59551A GPS Receiv er.
Chapter 4 Command Quick Reference Event T ime Stamping (59551A Only) 4-12 Operating an d Programming Guide Event Time Stam ping (59551A Only) The foll owing commands ar e provided to allo w you to time-tag and record events such as powe r surges and power outages.
Chapter 4 Command Quick Reference Serial I nterface Communication Operating and Programming Guide 4-13 Serial Inter face Communicat ion The foll owing commands ar e provided to allo w you to configure t he serial interface port(s) for in s trument communications.
Chapter 4 Command Quick Reference Receiver Init ialization 4-14 Operating an d Programming Guide Receiver Initiali zation The foll owing commands ar e provided to allo w you to initia lize or preset the serial interface port(s) and the Receive r t o their factory shipment val ues.
Chapter 4 Command Quick Reference Receiver Identi fication/Upgrade Operating and Programming Guide 4-15 Receiver Identification/Upgrade The comma nds provid ed in this section allow you to quer y the ident ification o f the Rec eiver, and to pe rform firmw are upg rades in the fiel d aft er you ob tain a new firmware di sk.
Chapter 4 Command Quick Reference Receiver Identi fication/Upgrade 4-16 Operating an d Programming Guide Receiver C ommands at a Glance.
Chapter 4 Command Quick Reference Receiver Identi fication/Upgrade Operating and Programming Guide 4-17 Receiver Commands at a Glance (cont’d).
Chapter 4 Command Quick Reference Status Reportin g System at a Glance 4-18 Operating an d Programming Guide Status Reporting Syst em at a Glance.
5 Command Reference.
Chapter 5 Command Reference Chapter Contents 5-2 Operating an d Programming Guide Chapter Contents This chapt er provides a description of eac h comm and that can be used to operate the GPS Receive r .
Chapter 5 Command Reference Chapter Contents Operating and Programming Guide 5-3 See Appendix B, “Command Syntax and Style ,” for details regarding command Expanded Syntax, par ameter types , and query response type s.
Chapter 5 Command Reference Command Syntax Conventi ons 5-4 Operating an d Programming Guide Command Syntax Conventions POSition Means yo u MUST use either all the upper case letters or the entir e word. The lower case letters are optional. F or example , POS and POSITION are both valid.
Chapter 5 Command Reference Description Format Operating and Programming Guide 5-5 Description Format Commands and Returns a c b the pulse sequence) is generated at the Pr :PULSe:STARt:DATE <four-d.
Chapter 5 Command Reference Description Format 5-6 Operating an d Programming Guide Query-Specific Information Description of Response Formats (ASCII-en coded) The following legend provides the meaning of each type of response format. Re fer to T able B-3 in Ap pendix B, “Command Syntax and Style, ” for details .
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-7 GPS Satellite Acquisiti on The GPS Receiver is design ed to acqu ire time trans fer info rmation (ti me, da te.
Chapter 5 Command Reference GPS Satellite Acquisition 5-8 Operating an d Programming Guide ! Compensating for Ante nna Delay :GPS:REFerence:ADELa y ...
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-9 F acilitating Initial T racking ______________________________ This comman d sets a n approxima te date f or faster i nitial G PS acqu isition. Following powerup, the Receiver obt a ins the current date from satellite data.
Chapter 5 Command Reference GPS Satellite Acquisition 5-10 Operating an d Programming Guide F acilitating Initial T racking ____________________ ( continued) This comman d sets an approx imate pos ition fo r faster init ial GPS acquisitio n. Followi ng powerup, the Receiver ref ines its position fro m the satellite data.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Gu ide 5-1 1 F acilitating Initial T racking ____________________ ( continued) This comman d sets a n approxima te tim e for faste r initial G PS acqu isition. Followin g poweru p, the Re ceiver obta ins th e current time from satellit e data.
Chapter 5 Command Reference GPS Satellite Acquisition 5-12 Operating an d Programming Guide Establishing P osition_______ ______________________________ This command def ines the positi on of the Receiv er. The Receiver uses this position to pred ict satellit e visib ility and to determi ne time.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-13 Establishing P osition ___________________________ (continued) LAST de notes the las t specifie d position . This parame ter is provid ed to cance l surv eying (a utomatic position c omputati on) and r estore the last pos ition settin g.
Chapter 5 Command Reference GPS Satellite Acquisition 5-14 Operating an d Programming Guide Establishing P osition ___________________________ (continued) This q uery r eturn s the current inst antaneo us po sition of the G PS a ntenna .
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-15 Establishing P osition ___________________________ (continued) This que ry identifies whethe r the Receiv er is in position- hold or survey mode. In survey mode, the Rece iver continually refines its position.
Chapter 5 Command Reference GPS Satellite Acquisition 5-16 Operating an d Programming Guide Establishing P osition ___________________________ (continued) This que ry identifies whe ther the Receiver is in surv ey or position-hol d mode. In survey mode, the Rece iver continually refines its position.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-17 Sele cting Satell ites _______________________________________ This command instructs t he Receiver t o allow tra cking tho se satel lites for which th e elev ation a ngle i s greate r than th is elevat ion mask angle .
Chapter 5 Command Reference GPS Satellite Acquisition 5-18 Operating an d Programming Guide Sele cting Satell ites _____________________________ (continued) 59551A This comman d adds t he specifie d sate llites to the list t hat the Re ceiver ign ores for trac king.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-19 Sele cting Satell ites _____________________________ (continued) 59551A This comman d adds the spe cified sa tellites to the l ist tha t the Re ceiver conside rs for t racking.
Chapter 5 Command Reference GPS Satellite Acquisition 5-20 Operating an d Programming Guide Sele cting Satell ites ______________________________ (co ntinued) The quer y :GPS:SA Tellite: TRACking :IGNore:CO UNt? returns the num ber of satellit es tha t are on the li st to ign ore for tra cking.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-21 Sele cting Satell ites ______________________________ (co ntinued) The que ry :GPS:SA Tellite: TRACkin g:IGNore :STATe? returns the ignored status of the specifie d satellit e.
Chapter 5 Command Reference GPS Satellite Acquisition 5-22 Operating an d Programming Guide Compensating for Antenna Delay _________________________ This comman d sets th e GPS an tenna del ay value in seconds. It instructs the Receiver t o output its 1 PPS ou tput pulse earlie r in time to compensa te for antenna ca ble delay .
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-23 Compensating for Antenna Delay_____________ (continued) Delay V alues for the 58520A/521A and 58520AA/521A LMR 400 Antenna Cables The nominal delay value is labele d on t he cables .
Chapter 5 Command Reference GPS Satellite Acquisition 5-24 Operating an d Programming Guide Monitoring Acquisition ___________________________________ This q uery identifi es that th e 1 PPS signal has locked t o a valid G PS reference and t he 1 PPS sign al itse lf is vali d.
Chapter 5 Command Reference GPS Satellite Acquisition Operating and Programming Guide 5-25 Monitoring Acquisition _________________________ (continued) This que ry retu rns the li st of sa tellite s (.
Chapter 5 Command Reference GPS Satellite Acquisition 5-26 Operating an d Programming Guide Monitoring Acquisition _________________________ (continued) This q uery re turns t he nu mber o f sate llit.
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-27 1 PPS Reference Synchronization 1 PPS and 10 MHz ( 58503B only) ou tput sig nals are g enerated b y the Receiver ’s intern al reference oscilla tor.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-28 Operating an d Programming Guide Monitoring 1 PPS Synchronization _______________________ This query returns the Receiver state. Response OFF, or HOLD, or WAIT, o r REC, or LOCK, or POW .
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-29 Monitoring 1 PPS Synchronization _____________ (continued) This qu ery returns the st ate of the front -panel GPS Lock LE D.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-30 Operating an d Programming Guide Assessing 1 PPS Q uality__________________________________ This query returns the Frequency Figure of Merit (FFOM). Use this query when you wa nt to know t he stab ili ty of the Receiver’s 10 MHz output.
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-31 Assessing 1 PPS Q uality ________________________ (continued) This query returns an e stimate of the time interval error t hat can be e xpected for a one day holdo ver, given the current state of SmartClock learning in the Receiver.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-32 Operating an d Programming Guide Assessing 1 PPS Q uality ________________________ (continued) This query returns the Time Figure of Merit. Use this query when you want to know the accuracy of the Recei ver’s 1 PPS out put.
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-33 Assessing 1 PPS Q uality ________________________ (continued) This query returns the duration o f th e present or most recent period of operatio n in the hol dover and hold over process es.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-34 Operating an d Programming Guide Assessing 1 PPS Q uality ________________________ (continued) This command sets the duration (in seconds) which represent s a li mit against which th e elaps ed time of holdove r is compared.
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-35 Assessing 1 PPS Q uality ________________________ (continued) This qu ery identifies if the Receiver ha s been in holdove r longer than the amount of time specified by the THRes hold command.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-36 Operating an d Programming Guide Operating in Holdover ____________________________________ " Initiating Manua l Holdover _________ __________________ _______ This comman d places the Receiv er in holdover mod e.
Chapter 5 Command Reference 1 PPS Reference Synchronizati on Operating and Programming Guide 5-37 Operating in Holdover __________________________ (continued ) " Recovering f rom Holdover _____ __________________ __________ This query returns prioritized reason fo r why the Receiver is waiting to recover.
Chapter 5 Command Reference 1 PPS Reference Synchronization 5-38 Operating an d Programming Guide Operating in Holdover __________________________ (continue d) " Recovering f rom Holdover (conti nued) This command initiates recovery from holdover if recovery was inhibited by time interval s exceed ing limit.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-39 Oper ating Status This section describes t he commands that can be use to obtain Receiver status information . There are s everal ways to obta in Receiver s tatus usin g commands.
Chapter 5 Command Reference Operating St atus 5-40 Operating an d Programming Guide " Reading and Qu al ifying Rec eiver Status <regi ster> = OPERation <register> = QUEStion able <.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-41 Receiver Ope ration at a Glance ___________________________ This query outputs a formatted Receiver Status screen. Use this screen to monito r GPS a cquisiti on, d eriva tion of time an d posi tion, and sync hronizat ion of reference o utputs to GPS.
Chapter 5 Command Reference Operating St atus 5-42 Operating an d Programming Guide Reading the Error Queu e _________________________________ This query returns the oldest error in the Error Que ue and removes that error from t he q ueue ( first in, f irst o ut).
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-43 Reading the Diagn ostic Log ______________________________ The Diag nost ic Log is o ne way t o obtain Receiv er statu s.
Chapter 5 Command Reference Operating St atus 5-44 Operating an d Programming Guide Reading the Diagn ostic Log ____________________ (con tinued) The DIAGnostic commands for the log are described in the fo l lowing text .
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-45 Reading the Diagn ostic Log _____________________ (continued) This comman d is an even t that remo ves all prev ious diag nostic lo g entries, an d effecti vely sets the number of diagnost ic log entries to one .
Chapter 5 Command Reference Operating St atus 5-46 Operating an d Programming Guide Reading the Diagn ostic Log _____________________ (continued) This qu ery identifies the number of ent ries in the dia gnostic log. Response Range is 1 to 222, maximum is subject to change.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-47 Reading the Diagn ostic Log _____________________ (continued) This query returns the user- specified diagnostic log entry. Expanded Sy ntax :DIAGnos tic:LOG:READ? <entry num ber> Parameter Range is 1 to current log count.
Chapter 5 Command Reference Operating St atus 5-48 Operating an d Programming Guide Monitoring Status/Alarm Conditions _____________________ The Receiver i s at all times monito ri ng various o perating conditions through a status/a larm reporting system.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-49 Monitoring Status/Alarm Conditions ___________ (continued ) Figure 5-1.
Chapter 5 Command Reference Operating St atus 5-50 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) The foll owing describe s, for each functional g roup of operating s tatus shown in Figure 5-1, each of the operati ng conditions that is monitored t hrough the stat us/alarm sy stem.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-51 Monitoring Status/Alarm Conditions ___________ (continued ) Hard wa re St atus This Op eration su bgroup comp rises oper ating st atus that indicates the heal th of th e Rec eiver ha rdwa re.
Chapter 5 Command Reference Operating St atus 5-52 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) Holdover Status This Operation subgroup is comprised of oper a ting status that occurs during holdove r.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-53 Monitoring Status/Alarm Conditions ___________ (continued ) Command Error Status This group cont ains events which indicate a comman d error has occurred, and an event which indicates that the power has cycled.
Chapter 5 Command Reference Operating St atus 5-54 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! C leari ng and Prese tting A larm s __________ _______.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-55 Monitoring Status/Alarm Conditions ___________ (continued ) ! Clearing and Prese tting Alarms (co ntinued) When the c.
Chapter 5 Command Reference Operating St atus 5-56 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Alarms _______ __________________ ____ Figure 5-2.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-57 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Alarms (continued) The setting of the Alarm Enab le Register (Figure 5-2) selects whic h summary status f rom the Alarm Condit ion Regis ter is e nabled t o generate an alarm.
Chapter 5 Command Reference Operating St atus 5-58 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Alarms (continued) This q uery reads t he Alarm Co ndition R egister ( Figure 5- 2).
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-59 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Receive r Status _________________ ___ Figure 5-3.
Chapter 5 Command Reference Operating St atus 5-60 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued) ! Reading and Qualifying Receive r Status (continued) This q uery reads t he sp ecified co ndition re gister (figures 5-3 and 5-1).
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-61 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Receive r Status (continued) Thi.
Chapter 5 Command Reference Operating St atus 5-62 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Receive r Status (continued) Th.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-63 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Receive r Status (continued) Rea.
Chapter 5 Command Reference Operating St atus 5-64 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Receive r Status (continued) Th.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-65 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualif ying Receiver Status (continued) Rea.
Chapter 5 Command Reference Operating St atus 5-66 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Command Error Status ___ _________ Figure 5-4.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-67 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reading and Qualifying Command Error Status ( continue d) This q uery iden tifies th e status conditio ns enabl ed to generate an alarm.
Chapter 5 Command Reference Operating St atus 5-68 Operating an d Programming Guide Monitoring Status/Alarm Conditions ___________ (continued ) ! Reporting Questionable Status _____ __________________ _____ This comma nd sets the User- reported bit of the Questionab le Conditi on Register.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-69 Monitoring Status/Alarm Conditions ___________ (continued ) ! Reporting Questionable Status (continued) This command ge nerates a transit ion of the User-report ed bit of the Questio nable Con dition Reg ister.
Chapter 5 Command Reference Operating St atus 5-70 Operating an d Programming Guide Assessing Receiver Health ____________________________ ____ This query causes an internal selftest a nd the respons e indicat es whether any errors were detected . This test takes about 40 seconds to complete.
Chapter 5 Command Reference Operating St atus Operating and Programming Guide 5-71 Assessing Receiver Health ______________________ (co nt inued ) This q uery return s the lifetime cou nt, indicat ing the total p owered-on time. Response Range of the int eger is 0 to 4,294,96 7,296 with a resolut ion of 1.
Chapter 5 Command Reference Operating St atus 5-72 Operating an d Programming Guide Assessing Receiver Health ______________________ (co nt inued ) This q uery r eturns t he result o f the la st test and th e type of tes t per forme d. Use this query, for exampl e, following poweru p to check the outco me of the powe rup self test .
Chapter 5 Command Reference System T ime Operating and Programming Guide 5-73 Syst em Time The GPS Receiver is designed to allow you access to a very accurate system clock that provides both date and .
Chapter 5 Command Reference System T ime 5-74 Operating an d Programming Guide Identifying T ime of Next 1 PPS Reference Edge __________ This query returns timecode message 980 to 20 ms prior to 1 PPS of indicated time.
Chapter 5 Command Reference System T ime Operating and Programming Guide 5-75 Reading Current Time _____________________________ _______ This query returns the current calendar date. The local calendar date is always referenced t o UTC time, offset by any local time zo ne value that ha s been provide d by the user.
Chapter 5 Command Reference System T ime 5-76 Operating an d Programming Guide Reading Current Time __________________________ (continued) This query returns th e current 24-hour time suitable for display (f or example, 15:23:06) .
Chapter 5 Command Reference System T ime Operating and Programming Guide 5-77 Applying Loca l Time Zone Offset _________________________ This command se ts the time zone local time offs et to provide an of fset from Universal Coordinated Time (UTC) t o serve as the basis fo r all reported time.
Chapter 5 Command Reference System T ime 5-78 Operating an d Programming Guide Defining the 1 PPS Referen ce Edge (59551A Only) ____ 59551A This c omman d sel ects t he po larity of th e 1 P PS on- time e dge. Expanded Sy ntax :PTIMe:PPS:EDGE RIS i ng or F ALLing Parameter The RISi ng parameter sets th e 1 PPS rising edg e as the on-tim e edge.
Chapter 5 Command Reference System T ime Operating and Programming Guide 5-79 Reading Leap Seco nd Status ______________________________ This query returns th e leap second difference accumulated betw een GPS time and UTC time since t he beginning of GPS time.
Chapter 5 Command Reference System T ime 5-80 Operating an d Programming Guide Reading Leap Second Status ____________________ (co ntinued) This query re turns the UTC ca lendar date of next le ap second. The ye ar, month, and day are ret urned. Response Three fie l ds are se parated by commas: <yea r>,<month>,<day> .
Chapter 5 Command Reference System T ime Operating and Programming Guide 5-81 Reading Leap Second Status ____________________ (co ntinued) Thi s query id entifies wh ether a le ap secon d is pend ing, dis tinguis hes betwe en leap seconds which extend the minute, and leap se conds which shorten the minute.
Chapter 5 Command Reference System T ime 5-82 Operating an d Programming Guide Reading Leap Second Status ____________________ (co ntinued) This q uery identif ies if a le ap second is pendin g. This query l ooks ahead to indicate a p ending leap second.
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) Operating and Programming Guide 5-83 Programmable Pulse Output (59551A O nly) The Progra mmable Pulse out put feature provi des a means of using t he GPS Receiver as a pulse generator.
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) 5-84 Operating an d Programming Guide 59551A Thi s command se ts the int erval b etween pu lses in se conds. Expanded Sy ntax :PULS e:CON Tinu ous :PERio d <second s> Parameter The <se conds> p arameter range is 1 to 315360 00, eq uivalent t o one ye ar.
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) Operating and Programming Guide 5-85 59551A This command controls whether the Pro gramma ble Pulse output will be just one pulse or a sequence of puls es. Expanded Sy ntax :PULSe:CONTinuous:STATe ON or OFF Parameter OFF sel ects one pulse.
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) 5-86 Operating an d Programming Guide 59551A This command se lects the pol arity of the Prog rammable Pulse on-t ime edge. Expanded Sy ntax :PULSe:REFeren c e:EDGE RISing or FALLing Parameter The RIS i ng parame ter sets the Prog rammable Pulse ri sing edge as the on-time edge .
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) Operating and Programming Guide 5-87 59551A This command i dentifies the date whe n the individual pulse (or first pulse of the puls e sequence) is genera ted at the Programma ble Pulse outpu t.
Chapter 5 Command Reference Programmable Pulse Output (59551A Only) 5-88 Operating an d Programming Guide 59551A This command i dentifies the time when the indivi dual pulse (or first pul se of the puls e sequence) is genera ted at the Programma ble Pulse outpu t.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-89 Event Time Stam ping (59551A Only) The time st amping feature allo ws you to use the Receive r with equipment such as a fault analy zer or a surge de tector t hat prod uces a T TL edge w hen so me impor tant ev ent hap pens in the base st ation.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) 5-90 Operating an d Programming Guide Defining the Time-stampe d Edge _________________________ 59551A This command selects the polarity of the edges the Receiver will time stamp.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-91 Clearing Time Stamp Memory ____________________________ 59551A This command cl ears the data in the time stamp measurement buffer for the user-speci fied Time Tag inp ut.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) 5-92 Operating an d Programming Guide Reading Time Stamps _________ ___________________________ 59551A This query o utputs data from the one specif ied time stamp mea surement buffer (or Time Tag input) .
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-93 Reading Time Stamps _________ _________________ (continued) 59551A This command selects the output format for the time stamps.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) 5-94 Operating an d Programming Guide Reading Time Stamps _________ _________________ (continued) 59551A This qu ery returns the numbe r of time stamps in each of the th ree Time Tag inputs .
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-95 Reading Time Stamps _________ _________________ (continued) Parameter "TSTamp 1"querie s for the number of points in Time Tag 1 input b uffer.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) 5-96 Operating an d Programming Guide Reading Time Stamps _________ _________________ (continued) Parameter <time ta g input> parameter: • "TSTa mp 1" to sele ct Time Ta g 1 input buffe r.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-97 Processing Memory Overflows ____________________________ 59551A This query returns an overflow count for e ach of the three Time Tag inputs. An “overflow count” occurs after 256 time stamps have been recorded.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) 5-98 Operating an d Programming Guide Processing Memory Overflows __________________ (continued) 59551A This query returns an overflo w count for the selected Time Tag input.
Chapter 5 Command Reference Event T ime Stamping (59551A Only) Operating and Programming Guide 5-99 Processing Memory Overflows __________________ (continued) 59551A This query returns t he state of the memory management protocol. Response FIRSt i ndic ates that the m emory retain s time stamps for t he firs t 256 ev ents detecte d.
Chapter 5 Command Reference Serial I nterface Communication 5-100 Operat ing and Programming Guide Serial Inter face Communicat ion The 59551 A and 5 8503B GPS R eceive rs provide a set o f commands t hat allow you to configure the serial interface port(s) fo r i nstrument communicati ons.
Chapter 5 Command Reference Serial I nterface Communication Operating and Programming Guide 5-101 Configuring I/O P orts ____________________ _________________ This query identifies whi ch serial port i s being used. Use this qu ery when the Receiver is instal led out o f sight o r at a remot e location .
Chapter 5 Command Reference Serial I nterface Communication 5-102 Operating and Programmi ng Guide Configuring I/O P orts ___________________________ (conti nued) This query returns the baud rate of specified port.
Chapter 5 Command Reference Serial I nterface Communication Operating and Programming Guide 5-103 Configuring I/O P orts ___________________________ (continued) This qu ery returns the data bit s value of the speci fied port.
Chapter 5 Command Reference Serial I nterface Communication 5-104 Operating and Programmi ng Guide Configuring I/O P orts ___________________________ (conti nued) This qu ery returns the duplex s tate of the speci fied port.
Chapter 5 Command Reference Serial I nterface Communication Operating and Programming Guide 5-105 Configuring I/O P orts ___________________________ (continued) This query returns the flow cont rol s tate of specified port.
Chapter 5 Command Reference Serial I nterface Communication 5-106 Operating and Programmi ng Guide Configuring I/O P orts ___________________________ (conti nued) This qu ery returns the parity se tting of the s pecified port.
Chapter 5 Command Reference Serial I nterface Communication Operating and Programming Guide 5-107 Configuring I/O P orts ___________________________ (continued) This qu ery returns the stop b its value of spe cified port.
Chapter 5 Command Reference Serial I nterface Communication 5-108 Operating and Programmi ng Guide Recovering th e Last Query Response _____________________ This query returns the l ast response it em issued th rough the Receiv er’s serial interface for use in an error recovery proc ess.
Chapter 5 Command Reference Receiver Init ialization Operating and Programming Guide 5-109 Receiver Initiali zation The foll owing commands ar e provided to allo w you to initia lize or preset the serial interface port(s) and the Receive r t o their factory shipment val ues.
Chapter 5 Command Reference Receiver Init ialization 5-1 10 Operating an d Programming Guide This command is an event that sets specified port parameters to t heir factory-defa ult values.
Chapter 5 Command Reference Receiver Init ialization Operating and Programming Guide 5-1 1 1 T able 5-2. System Preset (Fact ory Default) Parameter Settings Summary Commands :SYST em:PRESet *ESE ... 0 (NV * ) — See footnotes on the bottom of the next pa ge *S RE .
Chapter 5 Command Reference Receiver Init ialization 5-1 12 Operating an d Programming Guide :ST A T us:OPERation:ENABle ... 36 (NV) :ST A T us:OPERation:HAR Dw are:ENABl e ... 8191 (NV) :ST A T us:OPERation:H ARDware:NTRansiti on ... 0 (NV) :ST A T us:OPERation:H ARDware:PTRan sition .
Chapter 5 Command Reference Receiver Identi fication/Upgrade Operating and Programming Guide 5-1 13 Receiver Identification/Upgrade The comma nds provid ed in this section allow you to quer y the ident ification o f the Rec eiver, and to pe rform firmw are upg rades in the fiel d aft er you ob tain a new firmware di sk.
Chapter 5 Command Reference Receiver Identi fication/Upgrade 5-1 14 Operating an d Programming Guide Reading Product Identification __________________________ _ This query returns the Receiver identification.
Chapter 5 Command Reference Receiver Identi fication/Upgrade Operating and Programming Guide 5-1 15 Installing F irmware via I/O PORT 1 ______________________ The co mmand s in this sect ion rep resent t he co mmand set of the “I NSTAL L” language.
Chapter 5 Command Reference Receiver Identi fication/Upgrade 5-1 16 Operating an d Programming Guide Installing F irmware via I/O P ort 1 ______________ (continued) This qu ery verifies t he flash EEPROM has been erased. Response A value o f 1 indica tes that f lash EE PROM has been eras ed.
Chapter 5 Command Reference Receiver Identi fication/Upgrade Operating and Programming Guide 5-1 17 Installing F irmware via I/O P ort 1 ______________ (continued) Context D ependencies :SYSTem:PRESet clears the Error Queue. The queue is cleare d (emptied) on *CLS, power-on, or upon readi ng the last error from the queue .
Chapter 5 Command Reference Receiver Identi fication/Upgrade 5-1 18 Operating an d Programming Guide Installing F irmware via I/O P ort 1 ______________ (continued) This qu ery identifies the operatio n mode (primary or in stall) of the Rece iver. Response “INS TALL” or “PRI MARY” is retur ned.
A Error Messages.
Appendix A Error Messages Introducti on A-2 O perating and Programming Gui de Introduction This appendix expla ins how to read any errors fro m the Receiver, discusses the error queue, types of errors and general er ror behavior, and provides a table of all of the Receiver’s err ors and their probable causes.
Appendix A Error Messages Error Queue Operating and Programming Guide A -3 Error Queue As errors are detect ed, they are placed in an er ror queue. This queue is first in, first out. That is, if there has been more than one error, the first one in the queue is read out with :SYST :ER R? .
Appendix A Error Messages Error T ypes A-4 O perating and Programming Gui de Error Types Error numbers are cate gorized by type as shown in Table A-1. Each error is listed in Table A-2. The first erro r described in each class (for example, − 100, − 200, − 300, − 400) is a “generic” err or.
Appendix A Error Messages Error T ypes Operating and Programming Guide A -5 Semantic Error An <error number> in the range [ − 200 to − 299] indicates that an erro r has been detected by t he Receiver’s executi on control block.
Appendix A Error Messages General Error Behavior A-6 O perating and Programming Gui de General Err or Behavior For Commands (i.e. , non-query; doesn’t provide a respons e): • For any command that .
Appendix A Error Messages List of Errors Operating and Programming Guide A -7 List of Errors Table A -2 lists and des cribes the error messages T able A-2. Error Messages Number Error String Ca use +0 No error T he error queue is empty . Ever y error in the queue has been read (SYST em :ERRor? query) or the queue was cleared by power-on or *CLS.
Appendix A Error Messages List of Errors A-8 O perating and Programming Gui de . -178 Expression data not allowed E xpression data was encountered but was not allowed by the Receiver at this point in parsing. -200 Execution error This is the generic syntax error if the Receiver cannot detect more specific errors.
B Comman d Syntax and Style.
Appendix B Command Syntax and Style Appendix Contents B-2 O perating and Programming Gui de Appendix Contents This appendix pr ovides an overview of the Standard Commands fo r Programming Instrument (SCPI) syntax and style to help you program the Receiver.
Appendix B Command Syntax and Style Command T ypes, Format, and Ele m ents Operating and Programming Guide B -3 Command Types, Format, and El ements Command Types There are two types of GPS Receiver programming commands: IEEE 488.2 Common Commands and Standard Commands for Programmable Instruments (SCPI) .
Appendix B Command Syntax and Style Command T ypes, Format, and Elements B-4 O perating and Programming Gui de Elements of SCPI Comma nds A progr am command or query is composed of functional eleme nts that include a header (keyword s with colon separators), progr am data, and terminators .
Appendix B Command Syntax and Style Command T ypes, Format, and Ele m ents Operating and Programming Guide B -5 Abbreviated Co mmands The command syntax shows most keywor ds as a mixture of upper and lower c ase letters. Upper case let ters indicate the abbreviated spelling for the command.
Appendix B Command Syntax and Style Command T ypes, Format, and Elements B-6 O perating and Programming Gui de Parameter Separat or If you send more than one par ameter with a single command, you must separate adjacent p arameters with a comma.
Appendix B Command Syntax and Style Command T ypes, Format, and Ele m ents Operating and Programming Guide B -7 Suffix Mu ltipliers Table B-2 li sts the suff ix multipliers th at can be used wit h suffix elements (except PCT and DEG).
Appendix B Command Syntax and Style Command T ypes, Format, and Elements B-8 O perating and Programming Gui de NOTE: <new line> = ASCII character decimal 10 <carriage return> = ASCII character decimal 13 Figure B-3. Simplified Program Mes sage Syntax Diagram When using IEEE 488.
Appendix B Command Syntax and Style Command T ypes, Format, and Ele m ents Operating and Programming Guide B -9 If the “ :”(which is follo w ing the “;” and is i n front of GPS ) is omitted, the Rece iver assum es th at th e sec ond c omm and is :SYNC:HOLD:GPS:SA T :VIS:PRED? and generates a syntax error.
Appendix B Command Syntax and Style Command T ypes, Format, and Elements B-10 Operating an d Programming Guide Response Formats Table B-3 contains expla nations of response formats. T able B-3. Response Formats Format Description ± dd This numer ic for mat repres ents an in teger (e .
Appendix B Command Syntax and Style Command T ypes, Format, and Ele m ents Operating and Programming Gu ide B-1 1 XYZ ASCII- encoded b ytes co rrespondi ng to th e literal u sed as th e command para meter .
Appendix B Command Syntax and Style Reference Documenta tion B-12 Operating an d Programming Guide Reference Docu mentation This section contains a list of documentatio n related to the use of the Receiver’s RS- 232C serial port. Add itional information that you may find useful can be found in the following public ations: 1.
C Receiver Firmware Installation.
Appendix C Receiver Firmware Inst allation Downloading New Firmware Using SatStat Program C-2 Operating an d Programming Guide Downloading New Firmware Using SatStat Program 1 Copy th e file of the u pdated firmware disk to a di rectory on yo ur PC dis k dr ive.
Appendix C Receiver Firmware Inst allation Downloading New Firmware Using SatStat Program Operating and Programming Guide C-3 NOTE Prior to download, inte rrogate the product, r ecord any custom confi guration paramet ers. This step is nec essary because downloading new in strument firmwar e will reset all paramete rs to syste m-preset de faults.
Appendix C Receiver Firmware Inst allation Downloading New Firmware Using SatStat Program C-4 Operating an d Programming Guide downloading t im e vari es de pending on the type of PC you have, b ut with communication s ettings optimized a typical tim e is about 30 minutes.
D Performance Tests Verifying Specif ications.
Appendix D Performance T ests Introducti on D-2 Operating an d Programming Guide Introduction This appendix p rovides procedures to te st the electrical perf ormance of the 58503B and 59551A GPS Receivers specifications li sted in and Appendix E, “58503B Specificat ions,” and Appendix F, “59551A Specific ations,” of the.
Appendix D Performance T ests Equipment Require d Operating and Programming Guide D-3 Equipment Required * OV = Operational Verification P = Performance Tests T = T roubles hoot ing T able D-1.
Appendix D Performance T ests Before Y ou Start D-4 Operating an d Programming Guide Before You Start The time required to acquir e lock as described in the f ollowing section can vary signifi cantly depending on your l ocal conditions.
Appendix D Performance T ests Operational V erificat ion Operating and Programming Guide D-5 Operational Verifica tion Introduction The 58503B and 59551A GPS Receivers are designed to auto m aticall y detect and acquire satelli tes in order to begin providing prec is e frequency a nd time informa tion.
Appendix D Performance T ests Operational V erificat ion D-6 Operating an d Programming Guide 10 MHz Verification (58503 B Only) 1 Set the HP 54600B os cilloscope or equivale nt sweep rate to 10 0 ns /div, input amplitude to 0.2 Volts/div, and inp ut coupling to ac.
Appendix D Performance T ests Operational V erificat ion Operating and Programming Guide D-7 Figure D-2. 1 PPS Operational V erification Setup 3 Verify the presence of a TTL level pulse with approxi m ately 20 µ s pul se width.
Appendix D Performance T ests Operational V erificat ion D-8 Operating an d Programming Guide Figure D-3. 59551A IRIG- B Operational V erificat ion Setup Time of Day and PORT 1 R S-232C Serial Inte rface Verification 1 Connect a terminal or computer (set to 9600 baud , 8 data bits, 1 stop bit, and no parity and no pac e) to the rear-panel PORT 1 .
Appendix D Performance T ests Operational V erificat ion Operating and Programming Guide D-9 An alphanumeric s tring which starts with a “T” sho uld be displayed as shown in t he following example: T2199505112055233000049 Note that the value above wil l be differe nt for each test, depe nding on the loc al d ate a nd tim e.
Appendix D Performance T ests Operational V erificat ion D-10 Operat ing and Programming Guide Front Panel Display/Keyp ad Verification (5 8503B Option 001 Only) This tes ts the operation of the Front Panel Display/Keypad option f or the 58503B. 1 Disconnect and re-apply power to the 58503B.
Appendix D Performance T ests Operational V erificat ion Operating and Programming Gu ide D-1 1 Time Tagging (Stamping) Verification and Programmable Verificat ion (59551A Only) NOTE GPS ANTEN NA RE QUIRED . The steps below re quire that a GPS antenna be proper ly set up, and the 59551A is in GPS locked mode before proc eeding.
Appendix D Performance T ests Operational V erificat ion D-12 Operat ing and Programming Guide This clears the Time Tagging event regi sters of any data prior to the next step. 4 On the comput er or terminal, type :FORMA T :DA T A A SCII a nd press the Return key.
Appendix D Performance T ests Operational V erificat ion Operating and Programming Guide D-13 Programmable Pulse Ver ification (59551A O nly) 1 Ente r the follo wing comm ands from th e ter min al or co mput er: :PULSE:CONTINUOUS:PERIOD 1 This sets th e perio d to 1 sec ond.
Appendix D Performance T ests Operational V erificat ion D-14 Operating and Programmi ng Guide Figure D-5. 59551A Programmable Puls e Operational V erification Setup 6 Verify that a continuous s tream of TTL-compatible pulses are occ urri ng at a 1 sec ond rate .
Appendix D Performance T ests Operational V erificat ion Operating and Programming Guide D-15 Operational Verification Conclusion NOTE Perform the following st ep only if you w ish to re store memory of the 58503B or 59551A Receiver to the fa ctory default states.
Appendix D Performance T ests In Case of Difficulty D-16 Operating and Programmi ng Guide In Case of Difficu lty If any of the above te sts fail it should be re-c hecked before assu ming that the unit is defect ive.
Appendix D Performance T ests Complete Performance T ests Operating and Programming Guide D-17 Complete Performance Tests The spec ifications of th e 58503B and 59551A can be verified by performing t he Performance Tests provided in thi s section. Table D-2 lists a s umm ary of the 58503B/59551A Complete Performance Tests.
Appendix D Performance T ests Complete Performance T ests D-18 Operating and Programmi ng Guide Preliminary Test Setup If you have not connected the GPS antenna to the Receiver, perfor m the follo w ing pr eliminary procedure in this sectio n.
Appendix D Performance T ests Complete Performance T ests Operating and Programming Guide D-19 Test 1: 10 MHz Frequency Accuracy and 1 P PS Jitter (Locked to GPS) This test measures the r elative change in the 1 PPS puls es between the unit under test a nd a known accurate source.
Appendix D Performance T ests Complete Performance T ests D-20 Operating and Programmi ng Guide 4 Connect the re ar-panel 1 PPS from Receiver under t es t to Channe l 1 of the Universal Counter. 5 Connect the 1 PPS from the re ference standard (5071A) to Channel 2.
Appendix D Performance T ests Complete Performance T ests Operating and Programming Guide D-21 11 Again, allow the counter to acc um ulate 100 samples of time interval. 12 Note the largest deviati on (greater or less) from exac tly 1 second. This the w orst- case 1 PPS leading ed ge jitter.
Appendix D Performance T ests Complete Performance T ests D-22 Operating and Programmi ng Guide Test 2: 10 MHz Holdover A ging and 1 PPS Accumulated Ti me Error (Unlocked) The foll owi ng te sts are i den tica l to the prev iou s t ests , wi th th e exception that during the actual test, t he Receiver is not locked to the GPS .
Appendix D Performance T ests Complete Performance T ests Operating and Programming Guide D-23 8 Note the time interval average for 100 samples, either positive or negative. NOTE Do not re-connect the antenna at thi s time. It m ust remai n disconnec ted for the entire 24-hour period .
Appendix D Performance T ests Complete Performance T ests D-24 Operating and Programmi ng Guide Test 3: 1 PPS Time Accur acy (Locked) This specificat ion is a statisti cal probability that the Receiver will conform to the standard as described.
Appendix D Performance T ests Complete Performance T ests Operating and Programming Guide D-25.
Appendix D Performance T ests 58503B Performance T est Record D-26 Operating and Programmi ng Guide 58503B Per formance Test Record Model 58 503B GPS Time and Frequency Referenc e Receiver Seria l Number : _____ _______ ____ _______ ___ Repa ir/Wo rk Order No .
Appendix D Performance T ests 59551A Performance T est Record Operating and Programming Guide D-27 59551A Per formance Test Re cord Model 59551A GP S Measurements Synchronizat ion Module Seria l Number : _____ _______ ____ _______ ___ Repa ir/Wo rk Order No .
Appendix D Performance T ests 59551A Performance T est Record D-28 Operating and Programmi ng Guide.
E 58503B Specif ications.
Appendix E 58503B Specifica tions Specificat ions and Characteristics E-2 O perating and Programming Gui de Specificati ons and Character istics The specificatio ns and characteristics of the 58503B GPS Time and Frequency Refe rence Receiver ar e provided in thi s chapter.
Appendix E 58503B Specifica tions Specificat ions and Characteristics Operating and Programming Guide E -3 10 MH z Output Specifications Locked: Frequency Accuracy: Better th an 1 × 10 − 12 , for a one- day avera ge, 0° C to 50° C.
Appendix E 58503B Specifica tions Specificat ions and Characteristics E-4 O perating and Programming Gui de Power R equirements AC Power (standard): 90 to 132 Vac or 198 t o 264 Vac, automatically sel ected; 50 to 6 0 Hz. Option AW Q: Unit accepts : +24 Vdc or + 48 Vdc no minal.
Appendix E 58503B Specifica tions Specificat ions and Characteristics Operating and Programming Guide E -5 Other Information The standard 58503B does not include a display or a keypad.
Appendix E 58503B Specifica tions Specificat ions and Characteristics E-6 O perating and Programming Gui de This page i ntentionally left blank..
F 59551A Specif ications.
Appendix F 59551A Specific ations Specificat ions and Characteristics Operating and Programming Guide F-2 Specificati ons and Character istics The specificatio ns and characteristics of the 59551A GPS Measurements Synchronizat ion Module are provided in this chapter.
Appendix F 59551A Specific ations Specificat ions and Characteristics Operating and Programming Guide F-3 1P P S O u t p u t Specifications Locked: Jitter o f leading edge: < 750 ps rms wit h at least one sat ellite in view.
Appendix F 59551A Specific ations Specificat ions and Characteristics Operating and Programming Guide F-4 Environmental Spec ifications Measurements Synchronization M odul e (59551A) Operat ing: 0° C.
Appendix F 59551A Specific ations Specificat ions and Characteristics F-5 Operating an d Programming Guide Other Information The standard 59551A does not include a display or a keypad.
Appendix F 59551A Specific ations Specificat ions and Characteristics Operating and Programming Guide F-6 This page i ntentionally left blank..
Operating and Programming Guide C ommand Index-1 Command Index *CLS , 5-54 , 5-115 *ESE , 5-66 *ESE? , 5-6 7 *ESR? , 5-6 7 *IDN? , 5-114 *SRE , 5-57 *SRE? , 5- 57 *STB? , 5- 58 *TST? , 5-70 :DI AGnost.
Command Index Command Index-2 Operat ing and Programming Guide :GPS:REF erence :VALid? , 5-24 :GPS:SATellite:TRACking:COUNt? , 5-25 :GPS:SATellite:TRACking:EMANgle , 5-17 :GPS:SATellite:TRACking:EMANg.
Command Index Operating and Programming Guide C ommand Index-3 :SENSe:DATA:CLEar , 5-90 :SENSe:DATA:CLEar <d ata set> , 5-91 :SENSe:DATA:MEMory:OVERflow:COUNt? , 5-97 :SENSe:DATA:MEMory:OVERflow.
Command Index Command Index-4 Operat ing and Programming Guide :SYSTem:COMM unicate: <port> :BA UD , 5-101 :SYSTem:COMM unicate: <port> :BA UD? , 5-102 :SYSTem:COMM unicate: <port> :.
Operating and Programming Guide General Index-1 General Index SYMBOLS *CLS , 5-54 , 5-115 *ESE , 5-66 *ESE? , 5-6 7 *ESR? , 5-6 7 *IDN? , 5-114 *SRE , 5-57 *SRE? , 5- 57 *STB? , 5- 58 *TST? , 5-70 :DI.
General Index General Index- 2 Operating and Programmi ng Guide :SENSe:DATA:MEMory:OVERflow:COU Nt? , 5-97 :SENSe:DATA:MEMory:OVERflow:COU Nt? <data s et> , 5-98 :SENSe:DATA:MEMory:SAVE , 5-98 :.
General Index Operating and Programming Guide General Index-3 alar m ana lysi s , 4-8 , 5-39 , 5- 40 , 5-48 , 5-49 , 5-50 , 5-5 1 , 5-52 , 5-5 3 , 5-54 , 5-55 , 5-56 , 5-57 , 5-5 8 , 5-59 , 5-6 0 , 5-.
General Index General Index- 4 Operating and Programmi ng Guide data bits , 2-9 , 5-102 , 5-103 , 5-11 0 date and time outputs , 4-6 , 4-10 , 5-8 DB-25 connecto r , 2-5 DB-9 connect or , 2-5 dc power , 1-6 DCE , 2-5 dd, .
General Index Operating and Programming Guide General Index-5 holdover mode , 1-2 , 1-5 holdove r ope ration , 3-8 holdove r recovery , 4-7 , 5-37 holdover status , 4-9 holdove r threshol d , 3-14 How.
General Index General Index- 6 Operating and Programmi ng Guide NRf , B-5 null- modem cable , 2-5 O OHM , B-6 Operat ion sta tus , 5-39 , 5-48 , 5-50 , 5- 60 , 5-61 , 5-6 2 , 5-63 , 5-6 4 , 5-65 oper .
General Index Operating and Programming Guide General Index-7 quic k refe rence command l ist , 4-1 6 , 4- 17 factory i nstrument setti ngs , 5-111 factory seri al port settin gs , 5-110 stat us re po.
General Index General Index- 8 Operating and Programmi ng Guide status reporti ng system , 5-48 Status Report ing Syste m Diagram , 5-49 stat us sc ree n , 4-8 , 5- 41 status /alarm re porting s ystem.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Symmetricom 59551A è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Symmetricom 59551A - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Symmetricom 59551A imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Symmetricom 59551A ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Symmetricom 59551A, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Symmetricom 59551A.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Symmetricom 59551A. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Symmetricom 59551A insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
