Lathem DDC2 - Manual (Page 39)

Page 33 Digital Display Wall Clock Guide DDC2 / 4-RS Wiring
Standard Electric AR-3 3-Wire Minute Impulse
To
Other Clocks
24VDC / 48VDC
From
Master Clock
115VAC
Local
Power
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
24 VDC Pulse
Common
Y
E
L
/
W
H
T
48 VDC Correction
GRND
AC IN
AC RTN
B
L
K
B
L
K
V
IO
/
W
H
T
H
M
Clock must be set to actual time. Use of a 9Volt
alkaline battery is recommended to avoid resets
after power failures.