DCF77-system 6855
DCF77-system 6855 |
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Ranges of application
The model 6855 is an euroboard with display and key-pad. The clock is used in computer systems or controls of synchronisation processes.
Further main fields: acquisition of personnel time data, access control, error recording and computer synchronisation.
The system is synchronized by the time signal transmitter DCF77 in Mainflingen near Frankfurt am Main / Germany.
The model 6855 is available with 2 serial interfaces with the physical outputs RS232 RS422. At the 96-pole VG strip the signals of the serial interfaces and cyclic pulses can be taken as TTL signals. The supply voltage (+5 V DC) can be supplied at the 96-pole VG-strip. Furthermore, the system con be used as a DCF77 simulator. It is possible to simulate both DCF77 telegrams for changeover of summer-/wintertime ant the input of switching seconds.
If it is not possible to install the device into an existing system, the modules of the system 6000 can also be structured as "stand-alone-systems".
Model 685510 DCF77 plug-in board, 100 x 160 mm, with LCD display and key-pad, board width 20 U, completely configurable over the
key-pad.
Models 6855x1,...x2,...x3: "stand-alone-systems" consisting of
As a "stand-alone-system" the unit is mainly used to synchronize Sysplex Timer, NTP Time Server and for DCF77 simulation.
The additional boards FG6841H2-H3 enable an optical transmission via plastic cable or optical fiber.
General information about DCF77
Compatible unit in GPS - Model 6842
Example of order: device in table-top housing with keypad an display FG685523
| General | |
| Euroboard with key-pad: | 3 U / 20 HP |
| Voltage supply for the board: | + 5 V DC ± 5 % |
| Voltage supply for the system: | 230 V AC + 10% - 15% 120 V AC + 10% - 15% |
| Optional for the system: | 110 V DC (60 V - 120 V) 60 V DC (38 V - 75 V) 24 V DC (18 V - 36 V) |
| Temperature range: | 0 - 50°C for the specified data 0 - 70°C with reduced free-running characteristics |
| MTBF: | appr. 150,000 h |
| Receiver (Processor controlled AM / FM receiver DCF77) | |
| Input impedance receiver: | 50 Ohm |
| Sensitivity: | 40 µV |
| Antenna | |
| Antenna types: | see DCF77 accessories |
| Length of antenna cable: | max. 500 m antenna cable RG59 |
| Voltage supply for the antenna: | 5 V DC over the antenna cable |
| Accuracy | |
| DCF77 reception: | ± 2 msec. |
| Free-running characteristics: | ± 2 ppm after VCO control at a constant temperature between +10°C and +50°C |
| Back-up clock: | ± 25 ppm from +10°C to +50°C |
| Interfaces | |
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| Serial interface parameter | |
| Baud rates: | 150 - 9,600 baud |
| Stopbit: | 1 bit / 2 bit |
| Word length: | 7 bit / 8 bit |
| Parity: | no, even or odd |
| DCF77 simulation: | appr. 5 mVss to 50 Ohm |
| Additional components | see DCF77 accessories |
Current manuals in english and german language and preconfigured NTP-Packages can be found in the download area:
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