Meinberg DCF77 PCI511 Technical information
Contents
1. MbgMon part of the shipped driver also 14 Modulation is displayed as a LED the DCF77 field strength as a bar graph Optional ly the modulation signal can be made audible via the speaker of the computer g Meinberg Radio Clock Monitor v2 16 Ja x Setup Help Time Adjustment Time Service Windows Time Zone Log file PC system time Mo 22 05 2006 15 38 38 92 Westeurop ische Sommerzeit Reference time Mo 22 05 2006 15 38 38 94 CEST Time difference 0 01s Reference clock PCI511 v1 00 c Meinberg 2006 B000h State of time service active Time Adjustment 1 15ms s COM Port Revision Radio Clock PCI511 v1 00 c Meinberg 2006 B000h Radio Clock Time Mo 22 05 2006 15 38 39 05 CEST Last Sync Mo 22 05 2006 15 38 00 00 CEST Mode Normal Operation State Synchronized after last RESET Clock is synchronized rSignal modulation field strength acoustig modulation signal on off 15 Technical specifications RECEIVER ANTENNA RF AMPLITUDE MODULATION TIMECODE CHECK BATTERY BACKUP RELIABILITY OF OPERATION SYSTEM BUS INTERFACE DATA FORMAT Direct conversion quadrature receiver with automatic gain control Bandwidth approx 20 Hz Active external ferrite antenna in a plastic case Length of the cable up to more than 100m Standard BNC type connector 5m of RG174 cable Outdoor N type connector RG58 cable Ind2. 9130 mA all voltages supplied by PCI bus short PCI expansion board 0 70 C max 85 96 17 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 radio clock 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 twice 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 ports to the clock s 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 has been turned off an the on again 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 use
3. pins with TTL level and RS 232 levels are connected to each other the circuits on the board may be damaged The table below shows the assignments of the 9 pin connector and the correspon ding levers of the DIL switch Pin Signal SWITCH 45V 1 RxD in RS 232 TxD out RS 232 P MIN out TTL 5 GND reserved P SEC out RS 232 3 P SEC out TTL 4 vol lo ul A Un reserved The signals which have no lever of the DIL switch assigned are hard wired to the pins of the connector All levers of the DIL switch which are not listed in the table are reserved and should remain in the OFF position Installing the PCI511 in your computer Every PCI board is a plug amp play board After power up the computer s BIOS assigns resources like I O ports and interrupt lines 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 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 connected to the PCIS11 s coaxial plug at its rear 13 Aligning the antenna Generally the exact alignment of the antenna is important It has to be placed in longitudinal direction to the transmitter Frankfurt see arrow pr
4. TTL level only If required DIL switches can be set up to direct each of the pulses to a corresponding pin of the 9 pin connector in the rear panel 10 Block diagram PCI511 1OUI8UI ByEp Woda pererSequt Yara 3p o o SUIT 891 ONOD TLTSA oas d NIA d ous d weg s A S ZH 99 C UZE snq IDA Tonucojepep ssarppe SIB SUI Idd Ajddns 150d Pnuoapeyepssarppe AIOUIBUL umisoud ominpourp pe1e18ejut qiu eingerpenb JOJOLO 2010 LU WITS DOW pue lej tj ssedpueq Ta pubis 12 590 10308101d Suns peuondo EUUSIIE BALDE loopinof1ooput 11 Connectors and LEDs in the rear panel The rear panel includes the antenna connector three status LEDs the BSL button and a 9 pin sub D connector see figure below oro eoo antenna free run field strength modulation BSL key RxD TxD GND The LEDs let the user check for proper receiver operation The upper red LED is on if the clock is not synchronous to DCF77 This LED can only change when the minute changes seconds incre ment from 59 to 0 The brightness of the LED in the middle depends on the strength of the RF si gnal The lower green LED should be blinking exactly once per second corresponding to the time marks from DCF77 If this LED flickers there is some electrical noise around which prevents the receiver from decoding the time marks and syn chronizing All information given by these LEDs i
5. and the long time mark for logical ones The information on the current date and time as well as some parity and status bits can be decoded from the time marks of the 15th up to the 58th second every minute The absence of any time mark at the 59th second of a minute signals that a new minute will begin with the next time mark Our radio clocks decode the highly accurate information on date and time within a wide range around Germany So some of our clocks are installed in Bilbao Spain as well as in the city of Ume in northern Sweden fully satisfying the requirements of the users The radio clocks automatically switch to summertime and back The reception of the time information is free of charge and does not need to be registered Generally it is important to position the antenna in an optimal way It should be mounted at least 30 centimeters away from the clock unit and from solid steel The antenna should be aligned at a right angle to the direction of the transmitter Frank furt Figure decoding scheme M Start of Minute 0 1 s R RF Transmission via secondary antenna Al Announcementofachange in daylightsaving 21 22 Timezone identification Z1 Z2 0 1 Daylight saving disabled Z1 Z2 1 0 Daylight saving enabled A2 Announcement of aleap second S Startoftime codeinformation P1 P2 P3 Even parity bits Overview Because the radio clock PCI511 is designed as an universal board for computers with PCI bus operation within 3 3V an
6. J IEIBBERD Technical Information Operating Instructions DCF77 PCIS11 Impressum Meinberg Funkuhren GmbH amp Co KG Auf der Landwehr 22 D 31812 Bad Pyrmont Phone 49 52 81 9309 0 Fax 49 52 81 9309 30 Internet http www meinberg de Email info meinberg de May 22 2006 Table of Contents Impressum sanieren 2 Diver SCS eme 5 Readme H 6 aa aya Su GumakasQaa yqa A NEA 7 General information about DOP77 unse 9 di MeL habas os 10 Pulse OUTS nie 10 Block diagram POISI viereiseen ales 11 Connectors and LEDs in the rear panel 12 Pin assignments of the 9 pin connector 13 Installing the PCISLI Im your SHE 13 Aligning the antenna vpn tS RF etd EXE Ue ra e TRE 14 Technical Special 16 Firmware Updates uuu a iv lid dad 18 Replacing the lithium battery an 18 C E TIDE nee ei 18 Declaration of Conformity 19 Format of the Meinberg Standard time string 20 PCISUT Component layout 21 Driver diskette Readme file The driver diskette contains a file called readme txt which helps installing the driver correctly The content of this file is as follows Installation Instructions Execute Setup exe and choose the installation directory By default the installation directory is C Pro
7. d 5V systems is possible An external ferrit antenna makes the signal from DCF77 available to the on board long wave receiver The demodulated time marks are decoded by the clock s micro processor If no errors are detected in the current time message an additional plausi bility check against the previous time message is performed If that plausibility check passes too the buffered real time clock on the board is synchronized corre sponding to the decoded time and date Optionally the decoded date and time information can be converted to another time zone The time zone setting can be modified using the monitor program The current setting is saved permanently on the radio clock board Software running on the computer can read out the date time status and some more information Access to the board is made via writing to reading from I O ports It is possible but not necessary to let the board generate periodic hardware interrupts on the computer bus The diskette contains a driver program that keeps the computer s system time synchronous to the board time If the present delivered diskette doesn t contain a driver program for the operating system used it can be downloaded from http www meinberg de english sw Pulse outputs The radio clock PCI511 generates pulses whenever a new second P SEC or a new minute P MIN begins The P SEC pulse is available with TTL level 0 5V and RS 232 level 3 12V 3 12V the P MIN signal with
8. d for re placement The waste battery must be disposed as propo sed by the manufacturer of the battery CE label This device conforms to the directive 89 336 EWG onthe C approximation ofthe laws ofthe Member States ofthe European Community relating to electromagnetc compatibility 18 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 DCF77 Funkuhr Product Name Modell Typ PCI511 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 9 03 Class B Grenzwerte und Me verfahren f r Funkst rungen von informationstechnischen Einrichtungen Limits and methods of measurement of radio interference characteristics of information technology equipment EN55024 10 03 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 o
9. f the laws of the Member States relating to electromagnetic compatibility Bad Pyrmont den 07 06 2006 Authorized Signature 19 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 dd mm yy Ww hh mm ss uv 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 clock status characters u PP clock has not synchronized after reset space 20h clock has synchronized after reset v different for DCF77 or GPS receivers gt DCF77 clock currently runs on XTAL GPS receiver has not checked its position space 20h DCF77 clock is sync d with transmitter GPS receiver has determined its position time zone indicator U UTC Universal Time Coordinated formerly GMT MEZ European Standard Time daylight saving disabled S MESZ European Summertime daylight saving enabled an
10. gram Files Meinberg MbgMon Then shut down the computer install the Meinberg radio clock plug in board into a free slot and reboot Now you are asked to install a driver The driver file MEINBERG INF can be found in the subdirectory Driver PnP of the installation directory After the installation is complete start the monitor program MbgMon Start the time service control the state of the reference clock and configure the device s Copyright C Meinberg Funkuhren Bad Pyrmont Germany General information about DCF77 The radio clocks made by Meinberg receive the signal from the long wave transmit ter DCF77 This long wave transmitter installed in Mainflingen near Frankfurt Germany transmits the reference time of the Federal Republic of Germany This time reference is either the Central European Time Mitteleurop ische Zeit MEZ or the Central European Summer Time Mitteleurop ische Sommerzeit MESZ The trans mitter is controlled by the atomic clock plant at the Federal Physical Technical Institute PTB in Braunschweig Germany and transmits the current time of day date of month and day of week in coded second pulses Once every minute the complete time information is available At the beginning of every second the amplitude of the high precision 77 5 kHz carrier frequency is lowered by 75 for a period of 0 1 or 0 2 sec The length of these time marks represent a binary coding scheme using the short time mark for logical zeroes
11. icated by LED and on screen by monitor program Parity and consistency checking over a period of two minutes RF distortions indicated by both LED and a bit of the status register Without RF signal the clock runs on XTAL with an accuracy of 10 after 1 day of synchronization Lithium battery or Gold Cap when the computer is turned off the on board RTC keeps the time based on XTAL for more than 10 years lithium battery rsp 150 hours gold cap Microprocessor supervisory circuit provides watchdog timer power supply monitoring and backup battery switchover universal board for 3 3V and 5V systems 32 bit 33MHz or 66MHz PCI bus compatible to PCI specifications Binary byte serial 16 CONFIGURABLE TIME ZONES SERIAL INTERFACE PULSE OUTPUTS POWER REQUIREMENT PHYSICAL DIMENSION AMBIENT TEMPERATURE HUMIDITY Central European Time CET CEST default always CET no daylight saving time UTC East European Time EET EEST CET CEST 1h Transmission Speed Framing Mode of Operation 300 through 9600 Baud 8NI 7E2 8N2 or 8E1 send string per second per minute after request received Output String Meinberg standard time string described below Pulses every second PPS with TTL and RS232 level pulse duration 100 msec active high Pulses every minute PPM with TTL level pulse duration 100 msec active high 5V PCI bus 5V 3 3V PCI bus 5V and 3 3V Current consumption
12. inted on the label of the antenna A distance of several meters to TV or computer monitors to computers or microprocessor boards should be kept These devices can produce interference fields that lead to a poor or no DCF77 receiption If it is not possible to mount the antenna with a sufficient distance to the computer monitor it s line frequency should not be close to the RF frequency of DCF77 77 5 KHz The antenna should be installed with a minimum distance of 30cm to all metal objects Otherwise the ferrite antenna will be detuned and the received power decrea ses Alignment of the antenna can be done by watching the modulation and field strength LEDs Like described in chapter General information about DCF77 undis turbed pulses per second except 59 second without any interfering pulses are required for corrcect decoding of the DCF77 time telegram Therefore a modulation LED blinking exactly once per second is a criterion for good receiption of the DCF signal Because PCI511 uses a quadrature demodulator as receive circuit it is possible to evaluate the field strength of the DCF77 signal only Interfering signals within the bandwith of the receiver have no affect on the brightness of the field strength LED therefore If the radio clock is installed in the computer it may be difficult to use the status LEDs for alignment of the antenna Therefore modulation and field strength can be observed by using the monitor program
13. ouncement of discontinuity of time enabled during last hour before discontinuity comes in effect U announcement of start or end of daylight saving time A announcement of leap second insertion space 20h nothing announced End Of Text ASCII code 03h 20 PCI511 component layout PROS E 0 164 04b ir T ty ut Hb EJ t pan
14. s also available via the monitor program The BSL button behind the hole in the slot cover activates the clock s boot strap loader This mode of operation is needed if the clock s firmware shall be updated The 9 pin sub D connector is wired to the radio clock s serial port Pin assignment can be seen from the figure beside 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 requested by an incoming ASCII It is also possible to chan ge the radio clock s board time by sending such a string towards the clock Transmission speed framing and mode of ope ration can be modified using the monitor program The string format is described in the section Tech nical Specifications at the end of this manual 12 Pin assignments of the 9 pin connector When the clock is being shipped only the signals needed for the serial port are gated to their pins at the 9 pin connector If another signal shall be available outside the computer the corresponding lever of the DIL switch on the board must be set to the ON position to connect that signal to its associated pin Whenever an additional signal is connected through to the rear panel special care must be taken to the configuration of the cable used with the connector If
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