Operating Manual GPS D25 R/G/Y 6
Page 11
Optional: MASTER output and connecting slave
analogue clocks
The MASTER output supplies the slave analogue clock with power as well as with time data.
The time data are transmitted with coded seconds pulses, in compliance with the coding
scheme of DCF77 German radio telegram. The data bits are transmitted every second, at
the change of the minute the seconds pulse will be suppressed. Screwing posts at the slave
analogue clock serve as connectors, making an easy loop-through to a next slave clock
possible.
A 9-pin DSUB female connector MASTER is mounted at the rear panel of GPS D25 R/G/Y
6. Below the pin assignment and a wiring example:
KSO
V+
V-
SIGNAL
GND
1
2
7
8
V+
V-
SIGNAL
GND
DSUB9M
open ends
(to screwing posts)
(1)
(2)
(3)
(4)
Connection of an index
clock (slave) to a master
output
Twist the V+/V- and SIGNAL/GND signals. Pins not
specified should not be used.
Example: 2-pair twisted cable.
Cable lengths:
Every slave analogue clock requires <=11mA at >=6V. To calculate the maximum cable
length, output voltage, cross section, specific resistance and number of clocks have to be
involved. For radial arrangement of copper cables with a cross section of 0,22mm² and a
output voltage of 12V, the following cable lengths are possible for every lane:
no. of clocks
1
2
5
10
20
30
length m
3500 1750 700 350 175 117
The maximum number of clocks is limited by a 300mA fuse.
Содержание GPS D25 G 6
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