Lathem DDC2 User Manual

Page 50

DDC2 / 4-RS -24 Wiring

Digital Display Wall Clock Guide

Page 44

Appendix B - DDC2-RS-24 / DDC4-RS-24 Wiring

The DDC2-RS-24 and the DDC4-RS-24 allow for 24VAC supplied from the Master Clock or Power
Supply to power it for normal operation. These models can be used in installations where local 115VAC
power may not be available. When shipped, the DDC2-RS-24 and DDC4-RS-24 have an optional power
transformer that allows for 24VAC operation.

The 24VAC power from the Master Clock or Power Supply should be connected to the two black wires
leading from J1. (See figure 7 below for location of J1)

Correction wiring should be applied according to the secondary type selection as shown in Appendix A.

CAUTION: Applying any voltage higher than 24VAC to the input (two black leads
from J1) WILL cause damage to the DDC2-RS-24 and DDC4-RS-24 clocks.

Figure 7

JP2

Hours
Minutes
Up
Down

OPEN

DIP Switch

9VDC Alkaline Battery

Cradle

Lathem Time Corp.
DDC2\4 (E-PROM)

Jumper

Ground
Beeper
D-
D+

JP4

JP1

JP3

Fly Lead
Connector