Relay 1ch

Two module interface: 

1. DC+: Connect the power supply positive pole (voltage 5V-12V-24V).

2. DC-: Connect the power negative pole.

3. IN: Low level (5V-12V-24V) control relay pull in. 

Relay output terminal: 

1. NO: Relay normal open, the relay suspends before pulling in, and then short-connect with the COM.

2. COM: Relay common interface

3. NC: Relay normal close, short connected with COM before pulling inand suspended after pulling in.