Lathem DDC2 - Manual (Page 53)

Page 47 Digital Display Wall Clock Guide DDC2 / 4-RS -485 Wiring
OMCII to DDC2-RS / 4-RS
Pin Signal Signal JP4 Connection
1 Transmit Data (-) Transmit Data (-) D-
2 Transmit Data (+) Transmit Data (+) D+
8 Signal Ground Signal Ground GND
To
Other Clocks
BLK
BLK
115VAC
Local
Power
OMCII DB9 Female Plug
Cable should be RS232 twisted pair / CAT3 or CAT5 type.
Maximum distance to last DDC Clock is 4000 feet.
Last DDC Clock must have jumper installed on position J2.
See page 8 for details. Set switches 1-5 of S1 as shown.
Indicates depressed side of switch
OPEN
1 2 3 4 5 6 7 8
11 30
OMC II
G
N
D
o
f J
P
4
D
- o
f J
P
4
D
+
o
f J
P
4
G
N
D
T
ra
n
s
+
T
ra
n
s
-
:
H
M
DDC2-RS / 4-RS - JP4 Connector