Clock Radio User Manual

Table Of Contents

Chapter 4. WIRING

4-14

4-12 Connecting External Switch (RSW) Input

The DCP301 is provided with four external switch inputs as standard (eight optional). The optional eight inputs are

located on the add-on terminal base. Wire the external switch inputs across the standard and add-on terminal bases.

RSW1

RSW2

RSW3

RSW4

COM

RSW5

RSW6

RSW7

RSW8

RSW10

RSW11

RSW12

RSW9

Add-on terminal base

Standard terminal base

Contact

• The external switch inputs on the DCP301 have built-in power supplies (open

voltage 12Vdc). Be sure to use no-voltage contacts for external contacts.

• Use no-voltage contacts such as gold contacts whose small current can be

switched ON/OFF. On some relay contacts, the small current cannot be switched

ON/OFF. Use no-voltage contacts having a sufficient minimum switching ca-

pability with respect to the contact current and open voltage of the DCP301.

• When using a semiconductor (e.g. open-collector) as a no-voltage contact, use

a semiconductor whose contact terminal voltages at contact ON are 3V max.,

and whose leakage current at contact OFF is 0.1mA.

• External switch inputs on the DCP301/302 can be connected in parallel.

When connecting in parallel with other controllers, thoroughly check the condi-

tions of the other controller before configuring the control system.

Handling Precautions