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
OPEN
1
2
3
4
5
6
7
8
Set switches 1-5 of S1 as shown.
Indicates depressed side of switch
B
R
N
/
W
H
T
GRND
AC I N
AC RTN
A
B
C
V
IO
/
W
H
T
Y
E
L
/
W
H
T
B
LK
B
LK
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.
