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DDC2 / 4-RS Wiring Digital Display Wall Clock Guide Page 24
3-Wire minute Impulse (59
th
Minute)
Wiring applies to secondary wall clocks such as:
Lathem ISC 3-Wire Standard Impulse Cincinnati D2, D4
Stromberg Impulse Edwards Impulse Faraday Impulse
Simplex 75 Series, 91-4, 93-4, 941-4, 943-4 IBM 75 Series
O
P
E
N
1
2
3
4
5
6
7
8
Set switches 1-5 of S1 as shown.
Indicates depressed side of switch
BRN / WHT
GRND
AC IN
AC RTN
A
B
C
VIO / WHT
YEL / WHT
BLK
BLK
To
Other Clocks
24VDC
From
Master Clock
115VAC
Local
Power
H
M
Clock must be set within 20 minutes of actual time
for master to synchronize. Use of a 9Volt alkaline
battery is recommended to avoid resets after power
failures.