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6.3 Time Strings

Page 33

6.3.11 Format of the RACAL standard Time String

The RACAL standard Time String is a sequence of 16 ASCII characters terminated by a X (58h) character and

ending with the CR (Carriage Return, ASCII Code 0Dh) character. The format is:

<X><G><U>yymmddhhmmss<CR>

The letters printed in italics are replaced by ASCII numbers whereas the other

characters are part of the time string. The groups of characters as dened below:

<X>

Control character

code 58h

sending with one bit

accuracy at change of second

<G>

Control character

code 47h

<U>

Control character

code 55h

yymmdd

the current date:

yy

year of the century

(00..99)

mm

month

(01..12)

dd

day of month

(01..31)

hh:mm:ss

the current time:

hh

hours

(00..23)

mm

minutes

(00..59)

ss

seconds

(00..59, or 60 while leap second)

<CR>

Carriage Return, ASCII code 0Dh

Interface

parameters:

7 Databits, 1 Stopbit, odd. Parity, 9600 Bd

GPS170SV

Date: 4th November 2013

33

Содержание GPS170SV

Страница 1: ...MANUAL GPS170SV GPS Receiver Eurocard 4th November 2013 Meinberg Radio Clocks GmbH Co KG ...

Страница 2: ......

Страница 3: ... Circuit Assembly with surge voltage protection 15 4 5 Powering Up the System 16 5 Safety Instructions 17 5 1 Skilled Service Personnel only Replacing the Lithium Battery 17 5 2 CE Label 17 6 Technical Specifications GPS170 18 6 1 Oscillator speci cations 20 6 2 Technical Speci cations GPS Antenna 21 6 3 Time Strings 22 6 3 1 Format of the Meinberg Standard Time String 22 6 3 2 Format of the Meinb...

Страница 4: ...Page 0 7 The program GPSMON32 37 7 1 Serial Connection 37 7 2 Network Connection 37 7 3 Online Help 37 0 Date 4th November 2013 GPS170SV ...

Страница 5: ...einberg Radio Clocks GmbH Co KG Lange Wand 9 31812 Bad Pyrmont Germany Phone 49 0 52 81 93 09 0 Fax 49 0 52 81 93 09 30 Internet http www meinberg de Mail info meinberg de Date 2010 05 20 GPS170SV Date 4th November 2013 1 ...

Страница 6: ...ation of 24 satellites together with several active spares in six orbital planes 20000 km over ground provides a minimum of four satellites to be in view 24 hours a day at every point of the globe Four satellites need to be received simultaneously if both receiver position x y z and receiver clock o set from GPS system time must be computed All the satellites are monitored by control stations whic...

Страница 7: ...y the number of leap seconds which have been inserted into the UTC time scale since GPS was initiated in 1980 The current number of leap seconds is part of the navigation message supplied by the satellites so the internal real time of the GPS170 is based on UTC time scale Conversion to local time and annual daylight saving time can be done by the receiver s microprocessor if the corresponding para...

Страница 8: ...ument for details A separate document with programming instructions can be requested de ning a binary data format which can be used to exchange parameters with GPS170 via COM0 3 5 DCF77 Emulation The satellite controlled clock generates TTL level time marks active HIGH which are compatible with the time marks spread by the German long wave transmitter DCF77 This long wave transmitter installed in ...

Страница 9: ...ogrammable pulse optional At the male connector Typ VG64 there are three programmable TTL outputs Prog Pulse 0 2 which are arbi trarily programmable Other technical details are described at the end of this manual GPS170SV Date 4th November 2013 5 ...

Страница 10: ...ign engineer Hundreds of di erent time codes were formed some of which were standardized by the Inter Range Instrumentation Group IRIG in the early 60 s Except these IRIG Time Codes other formats like NASA36 XR3 or 2137 are still in use The board GPS170 however generates the IRIG B AFNOR NFS 87 500 code as well as IEEE1344 code which is an IRIG B123 coded extended by information for time zone leap...

Страница 11: ...Diagram Time Code modulated time code modulated time code hgh active and low active driver 50 Ω unbalanced driver TTL D A converter modulator digital sinewave generator microcontroller time code EPLD 10 MHz PPS GPS170SV Date 4th November 2013 7 ...

Страница 12: ...Page 8 3 GPS170SV Features 3 7 3 IRIG Standard Format 8 Date 4th November 2013 GPS170SV ...

Страница 13: ...3 7 Time Code optional Page 9 3 7 4 AFNOR Standard Format GPS170SV Date 4th November 2013 9 ...

Страница 14: ... Saving Time set during daylight saving time 64 Timezone O set Sign sign of TZ o set 0 1 65 TZ O set binary encoded 1 66 TZ O set binary encoded 2 O set from IRIG time to UTC time 67 TZ O set binary encoded 4 Encoded IRIG time plus TZ O set equals UTC at all times 68 TZ O set binary encoded 8 69 Position Identi er P7 70 TZ O set 0 5 hour set if additional half hour o set 71 TFOM Time gure of merit...

Страница 15: ... 100 pps wave signal 1kHz carrier frequency BCD time of year complete date SBS time of day Signal level according to NFS 87500 f IEEE1344 Code according to IEEE1344 1995 100 pps AM sine wave signal 1kHz carrier frequency BCD time of year SBS time of day IEEE1344 extensions for date timezone daylight saving and leap second in control functions CF segment also see table Assignment of CF segment in I...

Страница 16: ...TFOM in IEEE1344 mode can be disabled The segment is set to all zeros then 3 7 8 Outputs The module GPS170 provides modulated AM and unmodulated DCLS outputs The format of the timecodes is illustrated in the diagramms IRIG and AFNOR standard format AM Sine Wave Output The amplitude modulated carrier is available at the VG connector pin 14a The carrier frequency depends on the code and has a value ...

Страница 17: ...PROM If the BSL pushbutton behind the front panel is pressed while the system is powered up a bootstrap loader is actived and waits for instructions from the serial port COM0 The new rmware can be sent to GPS170SV from any standard PC with serial interface A loader program will be shipped together with the le containing the image of the new rmware The contents of the program memory will not be mod...

Страница 18: ...meter up to 60 mm or at a wall A 45 cm plastic tube two holders for wall mounting and clamps for pole mounting are added to every GPS170 A standard coaxial cable with 50 ohm impedance should be used to connect the antenna converter unit to the receiver The maximum lenght of cable between antenna and receiver depends on the attenuation factor of the used coaxial cable Up to four GPS170 receivers ca...

Страница 19: ...tection Optional a surge voltage protector for coaxial lines is available The shield has to be connected to earth as short as possible by using the included mounting bracket Normally you connect the antenna converter directly with the antenna cable to the system GPS170SV Date 4th November 2013 15 ...

Страница 20: ...ed by the receiver thus forcing the receiver to start scanning for satellites This mode is called Warm Boot because the receiver can obtain ID numbers of existing satellites from the valid almanac When the receiver has found four satellites in view it can update its new position and switch to Normal Operation If the almanac has been lost because the battery had been disconnected the receiver has t...

Страница 21: ... manufacturer of the battery 5 2 CE Label MEINBERG Radio Clocks declares under its sole responsibility that the product GPS170 to which this declaration relates is in conformity with the following standards Electromagnetic compatibility EN55022 2008 07 Class B Limits and methods of measurement of radio interference characteristics of information technology equipment EN55024 2003 10 Limits and meth...

Страница 22: ...TTL level ACCURACY OF PULSES after synchronization and 20 minutes of operation TCXO HQ OCXO LQ better than 250 nsec OCXO MQ OCXO HQ better than 100 nsec OCXO DHQ Rubidium better than 100 nsec better than 2 µsec during the rst 20 minutes of operation FREQUENCY OUTPUTS 10 MHz TTL level into 50 Ohm 1 MHz TTL level 100 kHz TTL level FREQUENZ SYNTHESIZER 1 8 Hz up to 10 MHz ACCURACY OF SYNTHESIZER base...

Страница 23: ...s only if invalid parameters have been con gured TIME CAPTURE INPUTS triggered on falling TTL slope Interval of events 1 5msec min Resolution 100ns POWER REQUIREMENTS 5V 5 max 1100mA see oscilatorspeci kations PHYSICAL DIMENSION 19 module in a closed 112mm high x 102mm wide closed aluminium case FRONT PANEL 3U 21HP 128mm high x 107mm wide Aluminium REAR EDGE CONNECTOR according to DIN 41612 type C...

Страница 24: ...Note1 2 10 8 0 2Hz Note1 1 5 10 9 15mHz Note1 5 10 10 5mHz Note1 1 10 10 1mHz Note1 2 10 11 0 2mHz Note1 accuracy free run 1 year 1 10 6 10Hz Note1 4 10 7 4Hz Note1 1 10 7 1Hz Note1 5 10 8 0 5Hz Note1 1 10 8 0 1Hz Note1 5 10 10 5mHz Note1 accuracy GPS synchronous average 24h 1 10 11 1 10 11 5 10 12 1 10 12 1 10 12 1 10 12 accuracy of time free run 1 day 4 3 ms 865 µs 65 µs 22 µs 4 5 µs 1 1 µs accu...

Страница 25: ...9 MHz CONVERTER local oscillator to converter frequency 10 MHz rst IF frequency 35 4 MHz POWER REQUIREMENTS 12V 18V 100mA provided via antenna cable CONNECTOR N Type female AMBIENT TEMPERATURE 40 65 C HOUSING ABS plastic case for outdoor installation IP66 Physical Dimension 44 44 240 240 140 140 450 450 70 70 M6 M6 180 180 68 68 84 84 6 6 GPS170SV Date 4th November 2013 21 ...

Страница 26: ... 59 ss seconds 00 59 or 60 while leap second uv clock status characters depending on clock type u GPS clock is running free without exact synchr PZF time frame not synchronized DCF77 clock has not synchronized after reset space 20h GPS clock is synchronous base accuracy is reached PZF time frame is synchronized DCF77 clock has synchronized after reset v GPS receiver has not checked its position PZ...

Страница 27: ...Of Text ASCII code 02h tt mm jj the current date tt day of month 01 31 mm month 01 12 jj year of the century 00 99 w the day of the week 1 7 1 monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second uv clock status characters u clock is running free without exact synchr space 20h clock is synchronous base accuracy is reached v receiver has not chec...

Страница 28: ...II numbers whereas the other characters are part of the time string The groups of characters as de ned below x 0 or 1 corresponding on the number of the capture input _ ASCII space 20h dd mm yy the capture date dd day of month 01 31 mm month 01 12 yy year of the century 00 99 hh mm ss f the capture time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second f fractions of second ...

Страница 29: ... 01 12 yy year of the century 00 99 w the day of the week 1 7 1 Monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second xxxx time zone indicator UTC Universal Time Coordinated formerly GMT MEZ European Standard Time daylight saving disabled MESZ European Summertime daylight saving enabled u clock status characters clock has not synchronized after r...

Страница 30: ... oo o set of local timezone related to UTC in hours and minutes ac clock status characters a clock has not synchronized after reset space 20h clock has synchronized after reset c GPS receiver has not checked its position space 20h GPS receiver has determined its position d time zone indicator S MESZ European Summertime daylight saving enabled MEZ European Standard Time daylight saving disabled f a...

Страница 31: ...ng signs are replaced by a space character 20h e longitude the following characters are possible E east of Greenwich W west of Greenwich hhhh altitude above WGS84 ellipsoid in meters leading signs are replaced by a space character 20h ETX End Of Text ASCII Code 03h GPS170SV Date 4th November 2013 27 ...

Страница 32: ...ime hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second ss fractions of seconds 1 10 1 100 A Status A time data valid V time data not valid bbbb bb latitude of receiver position in degrees leading signs are replaced by a space character 20h n latitude the following characters are possible N north of equator S south d equator lllll ll longitude of receiver position in degrees l...

Страница 33: ...actions of seconds 1 10 1 100 A Status A time data valid V time data not valid bbbb bbbbb latitude of receiver position in degrees leading signs are replaced by a space character 20h n latitude the following characters are possible N north of equator S south d equator lllll lllll longitude of receiver position in degrees leading signs are replaced by a space character 20h e longitude the following...

Страница 34: ... numbers or letters where as the other characters are part of the time string The groups of characters as de ned below Start character ASCII Code 24h sending with one bit accuracy at change of second hhmmss ss the current UTC time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second HH II the local timezone o set to UTC HH hours 00 13 II minutes 00 59 dd mm yy the current date ...

Страница 35: ...whereas the other characters are part of the time string The groups of characters as de ned below yy mm tt the current date yy year of the century 00 99 mm month 01 12 dd day of month 01 31 _ Space ASCII code 20h hh mm ss f the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second f milliseconds 000 999 cc Check sum EXCLUSIVE OR result of the previous characters dis...

Страница 36: ...placed by ASCII numbers whereas the other characters are part of the time string The groups of characters as de ned below T Start character sending with one bit accuracy at change of second yy mm dd the current date yy year of the century 00 99 mm month 01 12 dd day of month 01 31 ww the day of the week 01 07 01 monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 6...

Страница 37: ...he other characters are part of the time string The groups of characters as de ned below X Control character code 58h sending with one bit accuracy at change of second G Control character code 47h U Control character code 55h yymmdd the current date yy year of the century 00 99 mm month 01 12 dd day of month 01 31 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 whi...

Страница 38: ...ted in italics are replaced by ASCII numbers whereas the other characters are part of the time string The groups of characters as de ned below SOH Start of Header ASCII control character sending with one bit accuracy at change of second ddd day of year 001 366 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second q Quality indicator space Time Sync GPS ...

Страница 39: ... are replaced by ASCII numbers whereas the other characters are part of the time string The groups of characters as de ned below SOH Start of Header ASCII control character sending with one bit accuracy at change of second ddd day of year 001 366 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second q Quality indicator space Time Sync GPS lock no Time S...

Страница 40: ...Hz frequency output TTL level TIME CODE DC 13a Time code unmod out TIME CODE AM 14a Time code mod out 3Vpp DCF_MARK out 17c DCF77 compatible second marks TTL level active high length 100 200 msec TIME_SYN 19c TTL output HIGH level if synchronization has been achieved LOW level after reset or in case of serious errors e g antenna faulty F_SYNTH 21c Synthesizer output TTL Pegel F_SYNTH_OD 22c Synthe...

Страница 41: ...ommunication Select the menu item Enforce Connection in menu Connection and click Start in the apperaring window Some rmware versions of the GPS receiver do not support this way of setting up a connection If Enforce Connection doesn t succeed apparently please change the serial port parameter of GPS COM0 manually to the PCs parameters 7 2 Network Connection only clocks with Ethernet access Setting...

Страница 42: ...Page 38 7 The program GPSMON32 38 Date 4th November 2013 GPS170SV ...

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