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Digital Display Wall Clock Guide
DDC2 / 4-RS Wiring
3-Wire Synchronous (24VAC Correction)
OPEN
1
2
3
4
5
6
7
8
Set switches 1-5 of S1 as shown.
Indicates depressed side of switch
Wiring applies to secondary wall clocks such as:
Lathem type SS Cincinnati D10 IBM 77 Series
Simplex 77 Series, 93-9, 91-9, 941-9, 943-9
Stromberg 3000
To
Other Clocks
24VAC
From
Master Clock
H
M
115VAC
Local
Power
B
L
U
/
W
H
T
Correction
B
R
N
/
W
H
T
Return
GRND
AC IN
AC RTN
B
L
K
B
L
K
Clock will correct minutes hourly at HH:59 and
hour and minutes twice daily at 5:59.
