TCR170PEX Technical Information Operating Instructions
Contents
1. wore _ BAPM uondo yndut ondo spoosuun psyepnpourum ondo may L en ml I dnooosoyd mdur spoosuty peyepnpouun mdur sposauun pagemnpotu 12 Functional description of receiver After the received IRIG code has passed a consistency check the software clock and the battery backed realtime clock of TCR170PEX are synchronized to the external time reference If an error in the IRIG telegram is detected the system clock of the board switches to holdover mode IRIG code includes day of year information only 1 366 and no complete date The complete date is calculated by using the IRIG day of year information and the year stored in the battery backed realtime clock To achieve synchronization of TCR170PEX the year stored in the realtime clock must be set correctly therefore Date and time kept in the realtime clock can be set by sending a Meinberg Standard Time Telegram to the serial interface COMO or via the PCI bus The internal system clock is always set to the received IRIG time which might have a local offset to UTC Only if TCR170PEX is configured with this offset Meinberg driver software is able to set the system time of the computer correctly Conversion from UTC to local time including handling of daylight saving year by year can be done by the board s microprocessor if the corresponding parameters are set up with the help of the monitor software The time zone is entered as offset of seconds from UTC e g f2. 9180 Sug Y 9191 SWG 0 1 Aveutg g haeutg 11g 1041u0 Pa yb1ey se le a 8 rZ OOZ GOI Br Br zZ azal Br CZ HR S Z 1 Gaz L Sr zZ LTT ad 6d sd IM 9a Ga bd Dong d ea Zd la Lol Lol a MO AYYNI LH919818 ES AWO 40 3411 SSS SNOLLINNA TOYLNDI I351 0 Sava SUNDH SILNNIH SONDIIS CATING 9 9191 gt L YYJA J0 IWIL 098 8 9191 SONOIISITIIN AT Y 9181 SANOIISITIIN NI SWIL SAAAd NAMA AAA SARA MAMMAL MAA MAM MARA SAA Dd A MAMA MAMA MARA BARA BANER a8 Z ag DG Dt ae ac ol a 8 9101 ANOIIS I 4 91 SONODIS 1 IUYA4 IWIL AFNOR Standard format Sw Ka 1 haeu g a h utg o She Sk ool srzi L 8 kZ OZO B kZ l b Z1 Gazer B L0Z I 8 711 eo 8b Z1 oeea 8 Z 1 Zo Gut adad 5d 3d Zd 9d Sd bd Sd zd ld DECH l Lol D SONDIS AYYNI Ines Leg Lei L z L a J AvO 40 3W1L 595 HLNOW GEI uu3A 40 AVO SUNDH SILNNIH SONOI3S ABa 480033 I YYJA JO0 IWIL 038 E SANOIISSITIIN BT NI SWIL BA AS NAAR NAAR MARAE MAMA DARE MAA MAMA RA A NASA LAANA A MAMA MAM MARA NANAS BANAN a6 a8 BL a9 DG Dt ae ad ol a ONODSS 3WS4 AWIL PCI Express PCIe The main technical inovation of PCI Express is a serial data transmission compared to the parallel interfaces of other computer bus systems like ISA PCI and PCI X PCI Express defines a serial point to point connection the so called Link Ref Clock Selectable Width s Ref Clock The data transfer within a Link i
3. The pulse generator of TCR170PEX contains three independent channels PPOO PPO1 PPO2 Two of these TTL outputs can be mapped to pins at the 9 pin connector at the rear slot cover by using a DIL switch the third channel is available at a contact strip The pulse generator is able to provide a multitude of different pulses which are configured with the monitor program The active state of each channel is invertible the pulse duration settable between 10 msec and 10 sec in steps of 10 msec In the default mode of operation the pulse outputs are disabled until the receiver has synchronized after power up However the system can be configured to enable those outputs immediately after power up The following modes can be configured for each channel independently Timer mode Three on and off times per day per channel programmable Cyclic mode Generation of periodically repeated pulses A cycle time of two seconds would generate a pulse at 0 00 00 0 00 02 0 00 04 etc DCF77 Simulation mode The corresponding output simulates the DCF77 time telegram The time marks are representing the local time as configured by the user Single Shot Mode A single pulse of programmable length is generated once a day at a programmable point of time Per Sec Per Min Per Hr modes Pulses each second minute or hour Status One of three status messages can be emitted position OK The output is switched on if the receiver was able to compute its pos
4. warning capture overrun is being sent 19 Connectors and LEDs in the bracket code modulated timecode input lock holdover modulated timecode output BSL key t RxD TxD o GND The bracket of the board includes the BNC connectors for the amplitude modulated time codes input output two LEDs a key for activating the Bootstrap Loader and a 9 pin D Sub plug The LEDs signal the status of the IRIG receiver The right bicolor LED is switched to red whenever the inter nal timing of TCR170PEX is in holdo ver mode This state arises after power up and if an error in the IRIG telegram is detected This LED changes state only at change of minute This LED is switched to green lock if the internal timing of TCR170PEX is synchronized to the received IRIG code by a PLL Phase Locked Loop If the left green LED code is switched on the IRIG receiver detected a correct telegram at its input Pressing the hidden key BSL is re quired for activating the Bootstrap Loader before updating the firmware The 9 pin D Sub connector is wired to the board s serial port Pin assignment can be seen from the figure above This port can not be used as serial port for the computer Instead the clock uses the port to send out Meinberg s standard time string in order to control an external display or some other external device The string is sent out once per second once per minute or if
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6. Carriage return ASCII code 0Dh Line feed ASCH code 0Ah End Of Text ASCII code 03h 34 Konformitatserklarung Declaration of Conformity Hersteller Meinberg Funkuhren GmbH amp Co KG Manufacturer Auf der Landwehr 22 D 31812 Bad Pyrmont erkl rt in alleiniger Verantwortung da das Produkt declares under its sole responsibility that the product Produktbezeichnung Time code receiver generator Product Name Modell Typ TCR170PEX Model Designation auf das sich diese Erkl rung bezieht mit den folgenden Normen bereinstimmt to which this declaration relates is in conformity with the following standards EN55022 11 01 Class B Grenzwerte und Me verfahren f r Funkst run gen von informationstechnischen Einrichtungen Limits and methods of measurement of radio interference characteristics of information technology equipment EN55024 5 99 Grenzwerte und Me verfahren f r St rfestigkeit von informationstechnischen Einrichtungen Limits and methods of measurement of Immunity characteri stics of information technology equipment gem den Bestimmungen der Richtlinie 89 336 EWG zur Angleichung der Rechts vorschriften der Mitgliedstaaten ber die elektromagnetische Vertr glichkeit following the provisions of Directive 89 336 EEC on the approximation of the laws of the Member States relating to electromagnetic compatibility Bad Pyrmont den 04 11 2008 Authorized Signature 35 TCR170PEX E 15 10
7. Time String 30 Format of the Capture String essen 31 Format of the time string Uni Erlangen NTP 32 Format of the SAT Time String euueansisnnenneinnn 34 Konformit tserkl rung een 35 Content of the USB stick The included USB stick contains a driver program that keeps the computer s system time synchronous to the received IRIG time If the delivered stick doesn t include a driver program for the operating system used it can be downloaded from http www meinberg de english sw On the USB stick there is a file called readme txt which helps installing the driver correctly Introduction The transmission of coded timing signals began to take on widespread importance in the early 1950 s Especially the US missile and space programs were the forces behind the development of these time codes which were used for the correlation of data The definition of time code formats was completely arbitrary and left to the individual ideas of each design engineer Hundreds of different time codes were formed some of which were standardized by the Inter Range Instrumantation 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 TCR170PEX however only decodes IRIG A IRIG B or AFNOR NFS 87 500 formats The AFNOR code is a variant of the IRIG B format Within this code the complete date is transmitted ins
8. accuracy of oscillator holdover 1 day holdover 1 year short term stability lt 10 sec synchronized lt 10 sec holdover temperature dependant drift holdover phase noise 1 Hz besides carrier 10 Hz besides carrier 100 Hz besides carrier 1 kHzbesides carrier Option 5 10 1 10 1107 110 210 5 10 1 10 60 dB Hz 90 dB Hz 120 dB Hz 130 dB Hz OCXO LQ for higher accuracy in holdover mode Specifications look at oscillator options on Meinberg homepage output frequency accuracy 1 8 Hz to 10 kHz 1 8 Hz up to 10 MHz like system accuracy Phase synchronous to pulse per second 10 kHz to 10 MHz deviation of frequency lt 0 0047 Hz outputs TTL into 50 Q sine wave 1 5 V ms output impedance 200 Q RELIABILITY OF OPERATION INITIALIZATION BUS INTERFACE DATA FORMAT POWER REQUIREMENTS BOARD DIMENSIONS AMBIENT TEMPERATURE HUMIDITY microprocessor supervisory circuit provides watch dog timer power supply monitoring and backup battery switchover software watchdog monitors correct program flow and generates a reset in case of error detection software and realtime clock can be set by a serial Meinberg Standard Telegram via COMO or the PCI Express Interface Single lane x1 PCI Express PCIe Interface compatible to PCI Express specifications r1 0a binary byte serial 3 3V 200 mA 12V 120 mA standard heig
9. 3 mm minutes 00 59 ss seconds 00 59 or 60 while leap second sign of the offset of local timezone related to UTC offset of local timezone related to UTC in hours and minutes 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 lt space 20h GPS receiver has determined its position time zone indicator S MESZ European Summertime daylight saving enabled lt MEZ European Standard Time daylight saving disabled anouncement of discontinuity of time enabled during last hour before discontinuity comes in effect I announcement of start or end of daylight saving time lt space 20h nothing announced anouncement of discontinuity of time enabled during last hour before discontinuity comes in effect AT announcement of leap second insertion space 20h nothing announced leap second insertion 32 bbb bbbb ILU hhhh lt ETX gt L leap second is actually inserted active only in 60th sec space 20h no leap second is inserted latitude of receiver position in degrees leading signs are replaced by a space character 20h latitude the following characters are possible N north of equator S south d equator longitude of receiver position in degrees leading signs are replaced by a space character 20h longitude the following characters are possi
10. G specification doesn t define values for the output impedance of generators or the input impedance of receivers This fact led to incompatibility of some modu les because the manufacturers could choose the impedances freely For example if the output impedance of the generator is high and the input impedance of the receiver low the signal level at the receiver input might be too low for correct decoding Therefore the board TCR170PEX contains a jumper to select the impedance 50 Q 600 Q or 5 kQ of the input for modulated codes BNC to comply with the requirements of several systems Meinberg IRIG generators have an output impedance of 50 Q to build a mat ched transmission system when using a coaxial cable If such a generator is used to synchronize TCR170PEX the input impedance has to be set to 50 Q accordingly default on delivery In addition to the telegram the AFNOR code defines the input output impedances also If TCR170PEX is synchronized by this code an input impedance of 600 Q must be set The setting 5 kQ may be necessary if the generator has a high output impedance see specifications of manufacturer The driver software shows a bar chart for evaluation of the signal level at the receiver input Photocoupler input Pulse width modulated DC Level Shift codes are insulated by an onboard photo coupler The connection scheme is shown below Pin6 psup PIP R 2200 DCLS in DCLSin O DIP2 Pin DSUB Th
11. MMEMbEERG Technical Information Operating Instructions TCR170PEX Impressum Meinberg Funkuhren GmbH amp Co KG Lange Wand 9 D 31812 Telefon Telefax Internet Email Ba 44 44 d Pyrmont 49 0 52 81 9309 0 49 0 52 81 9309 30 http www meinberg de in fo meinberg de October 15 2009 Table of Contents Impressum sense ante 2 Content of the USB stick ae ee ae 5 Intro Te E 5 Description ee EE 6 IRIG Standard Formal een 7 AFNOR Standar oral nn 8 PCI Express PCIe naar 9 Features TORI 7OPEX nn ee 10 Block diagram TCR170PEX ns 12 Functional description of EEN anne en 13 Input SANS anne 14 Input impedance Ee 15 Photocoupler input en nen 15 Master E b a een 16 Functionality Of the generafof sce ss seaceraracdssdivocerataeasteaalenilalasawksasaaeed 16 HERE eege 16 EE SUB ee 16 Unmodulated Teenies en 17 Pulse outputs een 17 Asynclronous serial port anne 18 E abling e E 18 Lime pre III ea 19 Connectors and LEDs in the bracket nein 20 Pin assignments of the D Sub connector sssssssssssseseeseese 21 Jumper EE Ee b asbaaa l sa 22 Fr eguency synthesize nes ea Mauss een 23 Putting Into Operation are 23 Installing the TCR170PEX in your Computer 23 e ON 23 Conliguration of TER170PEX sense 24 Firmware Updates nee ki 24 Replacing th Lithium Battery una 25 Technical specification TERT70PEX E 26 Format of the Meinberg Standard
12. ard the module TCR170PEX is equipped with a TCXO Temperature Compensated Xtal Oscillator as master oscillator to provide a high accuracy in holdover mode of 1 10E 8 Optionally an OCXO Oven Controlled Xtal Oscillator is available for better accuracy Receiver Automatic gain control within the receive circuit for unmodulated codes allows decoding of IRIG or AFNOR signals with a carrier amplitude of 600 mV to 8 Noe The input stage is electrically insulated and has an impedance of either 50 Q 600 Q or 5 kQ selectable by a jumper The unmodulated input is accessible via a BNC connector in the bracket of TCR170PEX Unmodulated or DC Level Shift time codes must be connected to the D Sub plug of the module The receive circuit is insulated by an onboard photocoupler which can be driven by TTL or RS 422 signals for example In delivery state of TCR170PEX the contacts of the D Sub plug are not connected to the photocoupler Two DIP switches must be set to the ON position for making this connection Generator The generator of TCR170PEX is capable of producing time codes in IRIG B or AFNOR format They are available as modulated 3 V 1 Vpp into 50 Q and unmodulated DC Level Shift signals TTL into 50 Q and RS 422 A jumper on the board allows selection of active high or active low time codes Regarding time code and its offset to UTC the receiver and the generator can be configured independantly Thus TCR170PEX can be us
13. as been turned off an the on again 24 Replacing the Lithium Battery The life time of the lithium battery on the board is at least 10 years If the need arises to replace the battery the following should be noted ATTENTION Danger of explosion in case of inadequate replacement of the lithium battery Only identical batteries or batteries recommended by the manufacturer must be used for re placement The waste battery must be disposed as propo sed by the manufacturer of the battery 25 Technical specification TCR170PEX RECEIVER INPUT DECODING ACCURACY OF TIME BASE REQUIRED ACCURACY OF TIME CODE SOURCE HOLDOVER MODE BACKUP BATTERY AM input BNC connector insulated by a transformer impedance settable 50 Q 600 Q 5 kQ input signal 600 mV to 8 Vp Mark other ranges on request DC Level Shift input D Sub connector insulated by photocoupler internal series resistance 220 Q maximum forward current 50 mA diode vorward voltage 1 0 V 1 3 V optical input option optcal receive power min 3uW optical connector ST connector for GI 50 125um or GI 62 5 125um gradient fiber decoding of the following telegrams possible IRIG A133 A 132 A003 A002 IRIG B123 B122 B003 B002 AFNOR NFS 87 500 5 usec compared to IRIG reference marker 100ppm automatic switching to crystal time base accuracy approximately 1 10E 8 if decoder has been synchronous for more than 1h i
14. ated codes or pulse duration unmodulated DC level shift codes is synchro nized to the pulse per second PPS of the system based on the software clock The generated time code is independant from the settings for the received code It is possible to generated a different format and offset from UTC therefore Outputs TCR170PEX provides modulated and unmodulated DC level shift outputs As an option an optical output can be equipped instead of the modulated output It is available as ST connector for GI 50 125um or GI 62 5 125um gradient fiber Modulated output The amplitude modulated sine carrier is available a BNC coaxial plug connector in the bracket The carrier for IRIG B and AFNOR signals is 1 kHz The signal amplitu de is 3V MARK and IV SPACE into 50 Q The encoding is made by the number of MARK amplitudes during ten carrier waves The following agreements are valid binary 0 2 MARK amplitudes 8 SPACE amplitudes binary 1 5 MARK amplitudes 5 SPACE amplitudes position identifier 8 MARK amplitudes 2 SPACE amplitudes 16 Unmodulated outputs The pulse width modulated DC signals are coexistent to the modulated output and are available with TTL level into 50 Q and as RS 422 signal After bringing DIP switches into the ON position these outputs are available at the D Sub connector The active state of the unmodulated outputs can be set up by a jumper on the board TCR170PEX Pulse outputs
15. ble E east of Greenwich W west of Greenwich altitude above sea level in meters leading signs are replaced by a space character 20h End Of Text ASCH Code 03h 33 Format of the SAT Time String The SAT Time String is a sequence of 29 ASCII characters starting with the STX start of text character and ending with the ETX end of text character The format 1S lt STX gt dd mm yy w hh mm ssxxxxuv lt ETX gt 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 defined below lt STX gt dd mm yy W hh mm ss XXXX lt CR gt lt LF gt lt ETX gt Start Of Text ASCII code 02h the current date dd day of month 01 31 mm month 01 12 yy year of the century 00 99 the day of the week 1 7 1 Monday the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second time zone indicator UTC Universal Time Coordinated formerly GMT MEZ European Standard Time daylight saving disabled MESZ European Summertime daylight saving enabled clock status characters HI clock has not synchronized after reset space 20h clock has synchronized after reset anouncement of discontinuity of time enabled during last hour before discontinuity comes in effect announcement of start or end of daylight saving time space 20h nothing announced
16. d no carrier BCD time of year SBS time of day 1000pps DC Level Shift pulse width coded no carrier BCD time of year 100pps amplitude modulated sine wave signal 1 kHz carrier frequency BCD time of year SBS time of day 100pps amplitude modulated sine wave signal 1 kHz carrier frequency BCD time of year 100pps DC Level Shift pulse width coded no carrier BCD time of year SBS time of day 100pps DC Level Shift pulse width coded no carrier BCD time of year 100pps amplitude modulated sine wave signal 1 kHz carrier frequency BCD time of year complete date SBS time of day Amplitude modulated IRIG A B or AFNOR codes must be connected to the BNC jack in the bracket of TCR170PEX A shielded or a twisted pair cable should be used Pulse width modulated DC Level Shift signals are applied by using the D Sub plug Two DIP switches must be set to the ON position for connecting the contacts of the D Sub with the onboard photocoupler As an option an optical input can be equipped instead of the modulated input It is available as ST connector for GI 50 125um or GI 62 5 125um gradient fiber The IRIG code used must be configured with the monitor software The board TCR170PEX can t be used to decode amplitude modu lated and DC Level Shift signals simultaneously Depending on the selected code only the signal at the BNC jack the D Sub or the optional optical input connector is decoded 14 Input impedance The IRI
17. e internal series resistance allows direct connection of input signals with a maximum high level of 12 V TTL or RS 422 for example If signals with a higher amplitude are used an additional external series resistance must be applied for not exceeding the limit of the forward current of the input diode 50 mA The forward current should not be limited to a value of less than 10 mA to ensure save switching of the photocoupler 15 Master oscillator As standard TCR170PEX is equipped with a TCXO Temperature Compensated Xtal Oscillator optionally an OCXO LQ MQ HQ Oven Controlled Xtal Oscillator as master oscillator The internal timing of the module basis for the software clock the pulses and the generated time code is derived from this oscillator If the reciver is synchronized by an incomming time code the oscillator is adjusted to its nominal frequency The current correction factor is stored in a non volatile memory EE PROM of the system Therefore a high accuracy in holdover mode of 1 10E 8 is achieved if the receiver was synchronous for at least one hour The 10 MHz standard frequency is available at a contact strip with TTL level into 50 Q Functionality of the generator The time code generator of TCR170PEX is based on a DDS Direct Digital Synthe sis frequency generator which derives the sine carrier of the modulated code from the reference clock of the master oscillator The modulation of carrier amplitude modul
18. ed by a CR LF Carriage Return Line Feed combination The format is CHx_ft mm jj_hh mm ss fffffff lt CR gt lt LF gt 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 defined 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 HU the capture time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second HHI fractions of second 7 digits lt CR gt Carriage Return ASCII code 0Dh lt LF gt Line Feed ASCII code 0Ah 31 Format of the time string Uni Erlangen NTP The time string Uni Erlangen NTP of a GPS clock is a sequence of 66 ASCII characters starting with the STX start of text character and ending with the ETX end of text character The format is lt STX gt tt mm jj w hh mm ss voo oo acdfg i bbb bbbbn Lille hhhhm lt ETX gt 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 defined below lt STX gt dd mm yy W hh mm ss 00 00 ac Start Of Text ASCH code 02h the current date dd day of month 01 31 mm month 01 12 yy year of the century 00 99 the day of the week 1 7 1 Monday the current time hh hours 00 2
19. ed for code conversion As an option the module can be delivered with optical inputs outputs instead of the modulated signal paths The board TCR170PEX provides two configurable serial interfaces RS 232 COMO is available via the Sub D connector COM1 can be found at a contact strip of the board Two programmable pulse outputs can be connected to the D Sub plug by setting DIP switches into the ON position A contact strip on the board provides two TTL inputs CAPO and CAP1 that can be used to capture asynchronous time events These time stamps are readable via the PCI bus or the serial interface and can be evaluated by user software 10 TCR170PEX provides a synthesizer which can generate output frequencies from 1 8 Hz up to 10 MHz with TTL level into 50 and as a sine signal 11 Block diagram TCR170PEX yndynogndur zez uondo yndyno ndo Spo Datei ppo On THOS OWL TLL 2poosu1n psgepnporuum ZZP EN SO pogepnpoum Soot psrepnpotu 379075 sung Bal payoeq Areyeq SSLIOLLALI EIER AOAI YAS snq ssuda log SE HSJUT ssia 104 TONUoseRpAPppe TOR UO EP PAPPE MONTE Useld pma Jarmo SOI TU uondo Jay Wusuely 1 ondo qy AIA D 2180 u sigeun erSond Jadeys ss nd pue mama DOW J AUp pue JSNSAUOO F A IF 1 pros l u or 1do I JszIsayqu s BABMBUIS TOS OWI TLL 1 Aousnbay J sindyno TLL Mad TETSY TLL Sdd smdur TLL esodind fe sus3 penp syndur T J J a ydes suny penp
20. et when using IRIG codes therefore This setting can be done by a terminal software also If the time zone of the received IRIG code is not UTC the local offset to UTC must be configured to ensure correct function of the driver software If the local time zone is MEZ for example the board must be set to a local offset of 60min MEZ UTC 1 h The serial interface COMO can be configured to send a time telegram with reference to UTC or to the received local IRIG time Firmware Updates Whenever the on board software must be upgraded or modified the new firmware can be downloaded to the internal flash memory via the board s serial port COMO There is no need to open the computer case and insert a new EPROM If the button behind a hole in the rear slot cover is pressed for approximately 2 seconds a bootstrap loader is activated and waits for instructions from the serial port COMO A loader program shipped together with the file containing the image of the new firmware sends the new firmware from one of the computer s serial interfaces to the serial port COMO The bootstrap loader does not depend on the contents of the flash memory so if the update procedure is interrupted it can easily be repeated The contents of the program memory will not be modified until the loader program has sent the command to erase the flash memory So if the button has been pressed accidentally the system will be ready to operate again after the computer h
21. f the power supply fails an onboard realtime clock keeps time and date information important system parameters are stored in the RAM of the system lifetime of the Lithium battery at least 10 years 26 GENERATOR OUTPUTS PULSE OUTPUTS SERIAL PORT CAPTURE INPUTS modulated output unbalanced sine carrier kHz 3V MARK 1V SPACE into 50 Q unmodulated outputs DCLS TTL into 50 Q RS 422 active high or low selectable by jumper optical output option optical power typ 15uW optical connector ST connector for GI 50 125um or GI 62 5 125um gradient fiber three programmable outputs TTL level Default settings active only if sync PPOO change of second PPS pulse duration 200 msec valid on rising edge PPO change of minute PPM pulse duration 200 msec valid on rising edge PPO2 DCF77 simulation configurable RS 232 interface baudrates 300 Bd 38400 Bd framing 7E2 8N1 8N2 8E1 mode of operation string per second string per minute string on request Meinberg Standard Uni Erlangen SAT Capture Telegram time telegram triggered by falling TTL slope pulse repetition time 1 5 msec min resolution 800 nsec output of trigger event via PCI bus or serial interface 27 MASTER OSCILLATOR FREQUENCY SYNTHESIZER TCXO Temperature Compensated Xtal Oscillator accuracy compared to IRIG reference sync and 20 min of operation first 20 min after sync
22. ht expansion board 0 70 C max 85 Format of the Meinberg Standard Time String The Meinberg Standard Time String is a sequence of 32 ASCII characters starting with the STX start of text character and ending with the ETX end of text charac ter The format is lt STX gt D dd mm yy T w U hh mm ss uvxy lt ETX gt 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 defined below lt STX gt Start Of Text ASCII code 02h dd mm yy the current date dd day of month 01 31 mm month 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 uv clock status characters u clock has not synchronized after reset space 20h clock has synchronized after reset v different for DCF77 or GPS receivers DCF77 clock currently runs on XTAL GPS receiver has not checked its position lt space 20h DCF77 clock is sync d with transmitter GPS receiver has determined its position x time zone indicator U UTC Universal Time Coordinated formerly GMT space 20h local IRIG time y lt space 20h lt ETX gt End Of Text ASCII code 03h 30 Format of the Capture String The Meinberg GPS167 Capture String is a sequence of 31 ASCII characters termina t
23. ition time sync The output is switched on if the internal timing is synchronous to the GPS system all sync Logical AND of the above status messages The output is active if position is calculated AND the timing is synchronized Idle mode The output is inactive 17 The default configuration for the pulse outputs is PPOO Pulse each second PPS active HIGH pulse duration 200 msec PPO1 Pulse each minute PPM active HIGH pulse duration 200 msec PPO2 DCF77 Simulation Asynchronous serial port TCR170PEX provides two asynchronous serial RS 232 interfaces COMO is availab le at the D Sub connector COM1 can be found at a contact strip of the module The serial ports are sending a time string in the format Standard Meinberg Uni Erlangen or SAT either once per second once per minute or on request with ASCII only Furthermore they can be set up to send telegrams containing time capture events automatically or on request The format of these telegrams is descri bed in the Technical Specifications The transmission speed and the framing can be set via the PCI bus by using the shipped monitor software The serial interface COMO is used for a potential firmware update also The serial interfaces transmit the time zone set up in the appropriate menu A potential offset to UTC must be set correctly If a serial interface sends capture events automatically they can t be read via the PCI bus becau
24. or Germany MEZ UTC 3600 sec MESZ UTC 7200 sec The specific date of beginning and end of daylight saving can be generated automatically for several years The receiver calculates the switching times using a simple scheme e g for Germany Beginning of daylight saving is the first sunday after March 25th at two o clock gt MESZ End of daylight saving is the first sunday after October 25th at three o clock gt MEZ The parameters for time zone and switching to from daylight saving can be set by using the included monitor program If the same values for beginning and end of daylight saving are entered no switching of time will be made The time code output IRIG AFNOR of TCR170PEX can be generated by using these time zone settings or UTC as reference This can be set up with by the monitor program IRIG telegrams don t include announcers for the change of time zone daylight saving on off or for the insertion of a leap second Hence the clock will switch into freewheeling mode in case of such event and resynchronize afterwards 13 The board TCR170PEX decodes the following formats A133 A132 A003 A002 B123 B122 B003 B002 AFNOR NFS 87 500 Input signals 1000pps amplitude modulated sine wave signal 10 kHz carrier frequency BCD time of year SBS time of day 1000pps amplitude modulated sine wave signal 10 kHz carrier frequency BCD time of year 1000pps DC Level Shift pulse width code
25. requested by an incoming ASCII It is also possible to change the board s board time by sending such a string towards the clock Transmission speed framing and mode of operation can be modified using the monitor software The string format is described in the section Technical Specifications at the end of this manual 20 Pin assignments of the D Sub connector Only the signals of the serial interface are connected to the D Sub plug directly If another signal shall be connected to a pin of the plug a DIP switch must be set to the ON position Whenever an additional signal is connected to the rear panel special care must be taken to the configuration of the cable used with the connector If pins with TTL level and RS 232 levels are connected to each other the circuits on the board may be dama ged Because the pins 1 4 8 of the D Sub connector could be used for two different signals only one of the switches assigned to these pins might be put in the ON position The table below shows the pin assignments for the connector and the DIP switch assigned to each of the signals 5V PPOO out RS 232 RxD in RS 232 TxD out RS 232 PPO out TTL DCLS out RS 422 GND DCLS in photocoupler DCLS in photocoupler PPOO out TTL DCLS out RS 422 DCLS out TTL 1 2 3 4 5 6 7 8 9 PPOO programmable pulse output default pulse per second PPS PPO1 programmable pulse output defaul
26. s done via Lanes representing one wire pair for sending and one wire pair for receiving data This design leads to a full duplex connection clocked with 2 5 GHz capable of transfering a data volume of 250 MB s per lane in each direction Higher bandwith is implemented by using multiple lanes silmutaneously A PCI Express x16 slot for example uses sixteen lanes providing a data volume of 4 GB s For comparison when using conventional PCI the maximum data transfer rate is 133 MB s PCI X allows 1 GB s but only in one direction respectively A PCIe expansion board x1 like TCR170PEX for example can always be used in slots with a higher lane width x4 x8 x16 Interoperability x1 x4 One of the strong points of PCI Express is the 100 software compatibility to the well known PCI bus leading to a fast spreading The computer and the operating system are seeing the more powerfull PCIe bus just as the convetional PCI bus without any software update Features TCR170PEX The board TCR170PEX is designed as a standard height board for computers with PCI Express interface The data transfer to the computer is done by using a single PCI Express Lane x1 board TCR170PEX serves to decode and generate modulated AM and unmodulated DC Level Shift IRIG and AFNOR time codes AM codes are transmitted by modulating the amplitude of a sine wave carrier unmodulated codes by variation of the width of pulses As stand
27. se they are deleted from the buffer memory after transmission Enabling of outputs As standard the generator the pulse outputs the serial interfaces and the frequency synthesizer are switched off after power up until the receiver is synchronized By using the monitor software TCR170PEX can be set up to enable the outputs immedi ately after reset without synchronization This setting can be done independant for the pulses the serial interface and the synthesizer Enabling of the generator is coupled with the pulses because generation of time codes is synchronized by the pulse per second PPS 18 Time capture inputs Two time capture inputs CAPO and CAPI are provided at a contact strip of TCR170PEX to measure asynchronous time events A falling TTL slope at one of these inputs lets the microprocessor save the current real time in its capture buffer From the buffer capture events are transmitted via the PCI bus or the serial interface COMO The capture buffer can hold more than 500 events so either a burst of events with intervals down to less than 1 5 msec can be recorded or a continuous stream of events at a lower rate depending on the transmission speed of COMI can be measu red The format of the output string is ASCII see the technical specifications at the end of this document for details If the capture buffer is full a message capture buffer full is transmitted if the interval between two captures is too short the
28. t pulse per minute PPM DCLS DC level shift unmodulated timecode Those signals which do not have DIP switch assigned are always available at the connector All DIP switches not assigned are reserved and should remain in the OFF position 21 Jumper and contact strips The following diagram shows the possible jumper settings and the assignment of the contact strips of the board TCR170PEX J a t Same od cu ER J 690 Ohm 8 2 J 58 Ohm R D oo a GND a oy reserved a See reserved x capture input S capture input 1 DND E ow e 3 active high gt J active lou R an o ca ke a u synthesizer outputs only on request synthesizer sine GND synthesizer TTL GND programmable output PPO2 GND 1 MHz TTL GND d DIN XIGOL TRL GYNNAU 22 Frequency synthesizer The frequency synthesizer is capable to generate output frequencies of 1 8 Hz up to 10 MHz as sine wave signal and with TTL level into 50 Q Ifa frequency smaller than 1 kHz has been selected the following decimal places lead to real fractions of Hertz 0 1 1 8 Hz 0 3 1 3 Hz 0 6 1 6 Hz If a frequency of 0 Hz is selected the synthesizer is turned off The phase position of the output frequency can be set from 360 to 360 with a resolution of 0 1 If the phase angle is increased the signal is more delayed If the output frequency is bigger than 10 kHz the phase angle can t be set P
29. tead of the Control Functions of the IRIG telegram Description of IRIG Codes The specification of individual IRIG time code formats is defined in IRIG Standard 200 98 They are described by an alphabetical character followed by a three digit number sequence The following identification is taken from the IRIG Standard 200 98 only the codes relevant to TCR170PEX are listed character bit rate designation A 1000 pps B 100 pps Ist digit form designation 0 DC Level Shift width coded 1 sine wave carrier amplitude modulated 2nd digit carrier resolution 0 no carrier DC Level Shift 1 100 Hz 10 msec resolution 2 1 kHz 1 msec resolution 3 10 kHz 100 usec resolution 3rd digit coded expressions 0 BCD CF SBS 1 BCD CF 2 BCD 3 BCD SBS BCD time of year BCD coded CF Control Functions user defined SBS seconds of day since midnight binary IRIG Standard format 4 9141 SPUOI S LL Z Y 09141 SPUOD S 628 Z saimuly 89 SANH bl shed 161 SI 1N 0d SIHL 19 MIL g 9181 gt SW Lrcy 9IHI Sw ZH 0001 ZH 00001 gl vol YIIYYYI GALVINGOW TWOldAL 0 Aleu g lt g 91uI suz yore sng 231 NuSP UOTITSOg PUOISS 19 0 Iert lt 4 9IuI gt SuZo uoneang 43147 NUSP UOTITISOg PuoIas jaa a Jedd B 9141 Sug yore ang A34 NUSP UON ISOg PuoIaSs T g JedIdAy lt 4 9IuI gt sug g yore Ang 4atjusP UON TSOg puoIags Tg g JeatdA 9 941 Sug Y 9191 SWG 9 941 SwZ c DI9I Suz o G
30. utting into operation To achieve correct operation of the board the following points must be observed Installing the TCR170PEX in your Computer Every PCI Express board is a plug amp play board After power up the computer s BIOS assigns resources like I O ports and interrupt numbers to the board the user does not need to take care of the assignments The programs shipped with the board retrieve the settings from the BIOS The computer has to be turned off and its case must be opened The radio clock can be installed in any PCI Express slot not used yet The rear plane must be removed before the board can be plugged in carefully The computer s case should be closed again and the antenna can be connected to the coaxial plug at the clock s rear slot cover After the computer has been restarted the monitor software can be run in order to check the clock s configuration The computer s case should be closed after instal lation Power supply All power supplies needed by TCR170PEX are delivered by the PCI bus 23 Configuration of TCR170PEX The selection of the IRIG code configuration of the serial interface and a possible offset of the received IRIG time to UTC must be set up by the monitor software via the PCI bus In contrast to AFNOR NFS 87 500 the IRIG telegram containes only the day of year 1 366 instead of a complete date To ensure correct function of TCR170PEX the date stored in the realtime clock of the board must be s
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