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Digital Display Wall Clock Guide
DDC2 / 4-RS Wiring
3-Wire Minute Impulse (59
th
Minute With 12 Hour Correction)
B
R
N
/
W
H
T
GRND
AC IN
AC RTN
A
B
C
V
IO
/
W
H
T
Y
E
L
/
W
H
T
B
L
K
B
L
K
Wiring applies to secondary wall clocks such as:
Lathem ISC 3-Wire 12Hour
Simplex 91, 941
Set switches 1-5 of S1 as shown.
Indicates depressed side of switch
OPEN
1
2
3
4
5
6
7
8
To
Other Clocks
24VDC
From
Master Clock
115VAC
Local
Power
H
M
Clock will correct minutes hourly at HH:58 and
hour and minutes twice daily at 5:58.
