Document: 1785en03.doc
INTELLIGENT CLOCKS
Author.: TAn
Date: 2009-11-04
Page: 2 of 5
WESTERSTRAND URFABRIK AB
Box 133
Tel.
0506 48000
Internet: http://www.westerstrand.se
545 23 TÖREBODA
Fax.
0506 48051
E-mail:
General
Westerstrand analogue clock for wired DCF Time-Code from Marine Master Clock provides the possibility to
create a time distribution system, with high accuracy and high reliability.
The clock is intended for connection to a 2-wire bus which combines power supply and serial Time-Code
A built in microprocessor receives the Time Code, reads the position of the hands, and sets the clock to correct
time. The Time-Code, built up according to the DCF-format, contains information about year, month, day hour
and minute. At each minute shift seconds are synchronised as well. The transmission speed is 1 bit/second.
24VDC power supply for the built in electronics is combined with the Time-Code.
The clock is intended for time zone adjustment from a Marine master clock.
Installation
Connect Time code to time code input, connection movement.
The hands will step forward to 12 position and wait there for correct time message.
The speed is approx. 1 step/sec. When an accepted Time message the hands will step forward to correct time.
If the Marine master clock sends out a special time message (Time zone adjustment), the hands will step
forward rapidly to correct time.
The speed of the hands is 10 steps/ sec.
Synchronisation
When the clock has received and accepted a correct time code message, the hands will step forward rapidly.
If the Marine master clock sends out a special time message (Time zone adjustment), the hands will step
forward rapidly to correct time. The speed of hands is 10 steps/ sec.
Automatic feedback control of the hands at 12:00 and 00:00.
If the time code would disappear, the clock continues by means of the built-in quartz crystal.
During a power failure, the clock is temporarily stopped. After the restoration of power the hands steps forward
to the 12.00-position and waits, for a Time-Code to be received.
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