Page 25 Digital Display Wall Clock Guide DDC2 / 4-RS Wiring
3-Wire Minute Impulse (59th Minute With 12 Hour Correction)
B
C
123 4 5 6
Clock will correct minutes hourly at HH:58 and
hour and minutes twice daily at 5:58.
BRN / WHT
GRND
AC IN
A
C RTN
A
VIO / WHT
YEL / WHT
BLK
BLK
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
78
To
Other Clocks
24VDC
From
Master Cloc
k
H
M
115VAC
Local
Powe
r