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General Information about DCF77

The radio remote clocks made by Meinberg receive the signal from the long wave
transmitter 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 (Mitteleuropäische Zeit, MEZ) or the
Central European Summer Time (Mitteleuropäische Sommerzeit, MESZ). The transmit-
ter 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 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 remote 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 Umeå in northern Sweden - fully satisfying the require-
ments of the users. The radio remote 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 (Frankfurt).

Figure: Decoding Scheme

M

Start of Minute (0.1 sec)

R

RF Transmission via secondary antenna

A1

Announcement of a change in daylight sa-

ving

Z1, Z2 Time zone identification

A2

Announcement of a leap second

S

Start of time code information

P1, P2, P3

Parity bits

Summary of Contents for UA32S

Page 1: ...UA32S Technical Information Operating Instructions ...

Page 2: ...Meinberg Funkuhren GmbH Co KG Lange Wand 9 D 31812 Bad Pyrmont Phone 49 52 81 9309 0 Fax 49 52 81 9309 30 Internet http www meinberg de E Mail info meinberg de January 16 2007 ...

Page 3: ...ntrol LEDs 9 Asynchronous Serial Port 9 Optocoupler and Relay Outputs 9 Default Configuration 10 Customizing the UA32S Configuration 11 Serial Port 11 Cyclic Output Pulses 11 Programming Turn On And Turn Off Times 11 Listing of Default Configuration 12 Setting the Clock Manually 17 Technical Specifications UA32S 18 CE Label 19 Component Layout 21 UA32S Connector Pin Assignments 23 ...

Page 4: ...4 ...

Page 5: ...mation 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 remote clocks decode the highly accurate information on date and time within a wide range around Germany So some...

Page 6: ...6 ...

Page 7: ...ich can be used to read out information on date time and status The Meinberg standard time string can be sent automatically whenever a new second begins default and or the host has sent a request character Four optocoupler outputs and 3 relay outputs are available which can be used to switch external components or generate periodic pulses The outputs can be programmed using data tables residing at...

Page 8: ...F77 If this LED flashes intermediately there is some electrical noise around which prevents the microprocessor from decoding the time message In this case a better location for the antenna must be found After reset the LED labeled Freil indicates that the clock is running on xtal and has not synchronized with DCF77 yet Due to the plausibility checks it can take up to three minutes after power up u...

Page 9: ...ynchronous Serial Port The asynchronous serial port can be used to transmit information on date time and status to other devices Transmission speed and mode of operation can be configured by changing parameter bytes in the on board EPROM See the chapter Technical Informa tion for details Customers can specify their preferred settings when they order the board Optocoupler and Relay Outputs The prog...

Page 10: ... parameters Serial Port 9600 baud 7E2 time string per second Optocoupler 1 one pulse per second 2 one pulse per 10 seconds 3 one pulse per minutes 4 onc pulse per 3 minutes Relay1 one pulse per 15 minutes 2 one pulse per hour 3 one pulse per day 00 00 00 All of the output pulses have a width of 0 1 sec No switching times are programmed ...

Page 11: ...ses Each of the switching outputs can be turned on or off either cyclically or at predefined times In order to generate cyclic pulses at one of the outputs the corresponding byte in one and only one of the tables SEKTAB seconds MINTAB minutes or STDTAB hours must be set to a value not equal 0FFh The pulse length is configured in the table IMPLTAB in units of 0 1 second Example Optocoupler 3 shall ...

Page 12: ...INE SOURCE 1 2 3 Serial Port Configuration 4 5 0E00 6 ORG 0E00h 7 8 Serial Port Mode 9 00h Time String automatically once per second 10 others Time String only after Request Character received 11 0E00 00 12 SERMODE DB 00h 13 14 15 Serial Port Baud Rate 16 06h 600 Baud 17 12h 1200 Baud 18 24h 2400 Baud 19 48h 4800 Baud 20 96h 9600 Baud 21 0E01 96 22 BDRATE DB 96h 23 24 25 26 27 28 Cyclic Output Pul...

Page 13: ...n units of 0 1 sec 66 0E17 10 67 IMPLTAB DB 10h Relay 1 0E18 10 68 DB 10h Relay 2 0E19 01 69 DB 01h Relay 3 0E1A 01 70 DB 01h Optocoupler 1 0E1B 01 71 DB 01h Optocoupler 2 0E1C 01 72 DB 01h Optocoupler 3 0E1D 01 73 DB 01h Optocoupler 4 74 75 76 77 78 79 Tables with Turn On Turn Off Times 80 81 82 Each switching time defined in a sequence of hour minute second 83 84 85 0F00 86 ORG 0F00h 87 88 1 On ...

Page 14: ...C FFFFFF 123 DB 0FFh 0FFh 0FFh Optocoupler 1 ON 0F3F FFFFFF 124 DB 0FFh 0FFh 0FFh Optocoupler 1 OFF 125 0F42 FFFFFF 126 DB 0FFh 0FFh 0FFh Optocoupler 2 ON 0F45 FFFFFF 127 DB 0FFh 0FFh 0FFh Optocoupler 2 OFF 128 0F48 FFFFFF 129 DB 0FFh 0FFh 0FFh Optocoupler 3 ON 0F4B FFFFFF 130 DB 0FFh 0FFh 0FFh Optocoupler 3 OFF 131 0F4E FFFFFF 132 DB 0FFh 0FFh 0FFh Optocoupler 4 ON 0F51 FFFFFF 133 DB 0FFh 0FFh 0F...

Page 15: ...9C FFFFFF 178 DB 0FFh 0FFh 0FFh Optocoupler 3 ON 0F9F FFFFFF 179 DB 0FFh 0FFh 0FFh Optocoupler 3 OFF 180 0FA2 FFFFFF 181 DB 0FFh 0FFh 0FFh Optocoupler 4 ON 0FA5 FFFFFF 182 DB 0FFh 0FFh 0FFh Optocoupler 4 OFF 183 184 185 2 On Off cycles for weekend Saturday and Sunday 186 0FA8 FFFFFF 187 WOENDT2 DB 0FFh 0FFh 0FFh Relay 1 ON 0FAB FFFFFF 188 DB 0FFh 0FFh 0FFh Relay 1 OFF 189 0FAE FFFFFF 190 DB 0FFh 0...

Page 16: ...FFh Relay 3 ON 0FE1 FFFFFF 218 DB 0FFh 0FFh 0FFh Relay 3 OFF 219 0FE4 FFFFFF 220 DB 0FFh 0FFh 0FFh Optocoupler 1 ON 0FE7 FFFFFF 221 DB 0FFh 0FFh 0FFh Optocoupler 1 OFF 222 0FEA FFFFFF 223 DB 0FFh 0FFh 0FFh Optocoupler 2 ON 0FED FFFFFF 224 DB 0FFh 0FFh 0FFh Optocoupler 2 OFF 225 0FF0 FFFFFF 226 DB 0FFh 0FFh 0FFh Optocoupler 3 ON 0FF3 FFFFFF 227 DB 0FFh 0FFh 0FFh Optocoupler 3 OFF 228 0FF6 FFFFFF 22...

Page 17: ...ion no display TIMECODE CHECK Parity and consistency checking over a period of two minutes RF distortions indicated by both LED and a status character in the serial output string Without RF signal the clock runs on XTAL with an accuracy of 10 5 BATTERY BACKUP Gold Cap or Lithium battery when the power is turned off the on board RTC keeps the time based on XTAL for more than 150 hours gold cap rsp ...

Page 18: ...it 2 stop bits MODE OF OPERATION time string transmitted automatically once per second or after request character has been received OUTPUT STRING Meinberg standard time string CONNECTORS 32 pin rear VG edge connector DIN 41612 Subminiature coaxial RF connector SMB type POWER SUPPLY 5V approximately 150mA PHYSICAL DIMENSIONS Eurocard 100mm x 160mm 1 5mm Epoxy AMBIENT TEMPERATURE 0 50 C HUMIDITY max...

Page 19: ...19 CE Label This device conforms to the directive 89 336 EWG on the approximati on of the laws of the Member States of the European Community relating to electromagnetc compatibility ...

Page 20: ...20 ...

Page 21: ...21 Component Layout ...

Page 22: ...22 ...

Page 23: ...com 8 REL_3B_off REL_3B_on 10 REL_2_com REL_2_on 12 REL_1A_off REL_1A_on 14 REL_1A_com REL_1B_com 16 REL_1B_off REL_1B_on 18 20 OPTO_1_Collector OPTO_1_Emitter 22 OPTO_2_Collector OPTO_2_Emitter 24 OPTO_3_Collector OPTO_3_Emitter 26 OPTO_4_Collector OPTO_4_Emitter 28 COM0 TxD out 30 COM0 RxD in 32 GND GND ...

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