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DCF77N Clock
19-7-2001
Table of contents
INTRODUCTION 1
DCF77N clock 1
DCF transmitter 1
Pack list 1
Environmental requirements 1
DCF77N DCF-Antenna 1
OPERATION 2
Central Unit: 2
DCF Receiver: 3
RS232 cable: 3
HARDWARE INSTALLATION 4
SOFTWARE INSTALLATION 6
Utility diskette: 6
Installation for DOS 6
Installation for Windows 8
Using DCFWIN.EXE 8
Installation for the NOVELL network 9
WORKSTATION INSTALLATION: 9
FILESERVER INSTALLATION: 9
Time sequenced operation for DOS & NOVELL 10
IMPORTANT NOTES : 10
CLOCK COMMANDS 11
SPECIFICATIONS 16
DCF clock 16
RS232 Cable 16
Atomic DCF77 Clock
1
INTRODUCTION
DCF77N clock
The Elproma DCF77N clock is developed to guarantee the exact time on LAN or stand-alone
computer systems. The DCF77N clock system receives the radio signal which is transmitted by the
DCF77 Atomic clock transmitter near Frankfurt in Germany. The time signal is based on the
vibration frequency of the caesium atom. The accuracy is about 1 second in 300.000 years. The
Elproma DCF77N clock receives this time signal and checks whether the time frame is correct or
not.
Inside the DCF77N clock a system of internal clocks ensure that the received time is the correct
time. This way erroneous received time signals can never disturb your computer time and the exact
time is guaranteed. Even after 3 days without power and not receiving the DCF signal, the accurate
time is guaranteed. From now on the accurate time is always available for your operating system and
application programs.
Special features include a low voltage alarm contact, a switched mains and relay contact output
controlled by a programmable 7 day timer and a 24V slave clock output. The Elproma DCF77N
clock has found its way in the market where exact time is essential. Amongst the many applications
you will find: time registration systems, banking, stock exchange, transportation com- panies, airlines,
research, broadcasting
DCF transmitter
The DCF 77 signal is transmitted from Mainflingen (near Frankfurt/Main),
Germany (N 50° 01'; E 09° 00'). It contains complete information about time, date and season-
related time changes. Full transmission of the DCF signal lasts 59 seconds. The frequency used by
the DCF transmitter is 77.5 kHz.
The DCF77N clock can be used in all countries having central European time.
Pack list
?? This user manual
?? Central Unit DCF77N
?? DCF Receiver with cable
?? RS232 cable (9p-Dconn male- female)
?? Utility disk
Environmental requirements
DCF77N DCF-Antenna
Ambient temp. 10°C up to 40°C -30° up to +50° Celsius
Power supply 230VAC +/- 10% 8VDC up to 12VDC
?? The device should not be placed in direct sunlight.
?? The connected computer should have a ground connection.
?? Don't use any solvent chemicals, to clean the case use a cloth dampened with water or neutral
detergent.
Atomic DCF77 Clock
2
?? Please leave service to qualified personnel.
OPERATION
Central Unit:
At the front of the Central Unit there is a LCD display and a receive-signal indicator.
DCF CLOCK
Hour:min:sec.
Day, Date,Year
Relay mode:
Off, On,
Alarm, Timer
Signal quality
Signal LED
03:53:56 (Ti)
02-02-2002
Mains output
Relay On/Off
The back panel is equipped with two DB9, one HD15 , a small black pusk-button switch and one
female euro mains connector.
MAINS
Computer
Female conn.
Special functions
Female connector
Receiver
Male conn.
Switched
mains
output
Wake up
switch
?? Mains output: 230VAC mains output to switch an external device with the timer
?? Wake-up switch: Can be used to switch the mains output On
?? DB9F (female upper): Connector for RS232 cable to computer
?? DB9M (male lower): Connector for the DCF Receiver
?? HD15F : Special functions connector:
1. Alarm relay normally open and normally closed (NO,NC)
2. Timer relay NO, NC
Atomic DCF77 Clock
3
3. 24V Slave clock 1 second minute pulse
4. Extra RS232 for future use
The Central Unit is powered by the mains supply (230V). When the mains is connected and the
device is switched on, the 'Signal' LED indicates that the clock receives the DCF signal. This LED
flashes every second.
The Central Unit analyses the information received from the DCF transmitter and shows the received
time and date alternately on the display.
The time received and all the settings sent from the computer to the Central Unit are stored in the
RTC clock, which is battery-backed up. This guarantees that the Central Unit functions properly
even when there is a power failure.
If the Central Unit has a valid time and date, they can be transmitted automatically to the computer.
User-requested transmission of the time is always possible.
If the display blinks, it means that the Central Unit time and date are not valid anymore; in this case
the buzzer beeps every minute and the automatic transmission to the computer/server is stopped.
DCF Receiver:
DCF Receiver is build in a small case with a fixed cable. In the lower part of the case there is a
LED indicating received DCF signal. The LED is synchronous with the "Signal" LED of the Central
unit front. The can be used to point the antenna in the correct direction.
Frankfurt
This receiver can be fixed to an outside wall if necessary. The unit should be placed on a wall facing
Frankfurt, Germany. The direction of the antenna can be adjusted manually.
RS232 cable:
The RS232 cable connects the Central Unit with the RS232 computer interface. RS232 cable has a
DB9 female connector at the computer end, and a DB9 male connector at the Central Unit end.
Atomic DCF77 Clock
4
Hardware installation
Follow this procedure to install the DCF Clock :
1. Switch off your computer and peripherals.
2. Connect the DB9 female connector of the DCF Receiver (lower) to the DB9 female
connector located on the back panel of the Central Unit.
3. Connect the DB9 male connector (marked blue) of the RS232 cable to the DB9 connector
(marked blue) located on the back panel of the Central Unit. The DB25 male connector of
the RS232 cable has to be plugged into the COM1 or COM2 connector of your computer.
If you want to synchronize the time and date of the file server, connect the RS232 cable to
the work station operated by the supervisor or directly to the fileserver.
4. Plug the power cord into the mains supply.
5. Switch your computer and peripherals on again.
6. Locate the DCF Receiver in the best possible place for receiving the DCF signal. If the
received DCF signal is free from interference’s, the Central Unit should receive the valid
time and date within 5 minutes after the first power up.
Follow these steps to ensure best results:
a. The DCF Receiver should be placed far (not closer than 2 m) from
other electronic equipment (monitors, computers, Central Unit etc.).
b. The diode in the DCF Receiver and the "Signal" diode on the front
panel should flash (0.1 - 0.2 s) once per second.
There are only 59 flashes per minute.
c. The DCF Receiver should be placed horizontally (LED diode upwards) and
far from metal objects.
d. The best way to determine the proper orientation of the DCF Receiver is to rotate the
DCF Receiver until the condition described in b is obtained. Bad weather or other
interference can make the process of finding the proper orientation more difficult. The
Central Unit should receive the valid time and date when the interference is overcome.
Should the Central Unit lose the valid time and date (the display starts to flash), another
orientation or a better location for the DCF Receiver has to be found.
Atomic DCF77 Clock
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