Lathem DDC4 manual Gnd, Omcii to DDC2-RS / 4-RS

Page 47 Digital Display Wall Clock Guide DDC2 / 4-RS -485 Wiring

OMCII to DDC2-RS / 4-RS

115VAC	BLK
Local
Power	BLK

11 : 30

OMC II

Trans	Trans	GND
-	+

H

M

GND of JP4

D+ of JP4

D- of JP4

To

Other Clocks

OMCII DB9 Female Plug		DDC2-RS / 4-RS - JP4 Connector
Pin	Signal	Signal	JP4 Connection
1	Transmit Data (-)	Transmit Data (-)	D-
2	Transmit Data (+)	Transmit Data (+)	D+
8	Signal Ground	Signal Ground	GND

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

1 2 3 4 5 6 7 8

OPEN