Lathem manual Gnd, JP4, 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
		H
		M

11 30

OMC II

Trans	Trans	GND
-	+

OMCII DB9 Female Plug

GND	D+ of	D- of
of JP4	JP4	JP4

To

Other Clocks

DDC2-RS / 4-RS - JP4 Connector

Pin

1

2

8

Signal

Transmit Data (-)

Transmit Data (+)

Signal Ground

Signal

Transmit Data (-)

Transmit Data (+)

Signal Ground

JP4 Connection

D-

D+

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

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