1/2/4/8 Channel 5V Red Board Optocoupler Isolation Relay Module

Module size:
1 Road: 50 * 25 * 18.5MM
2 Road: 50 * 41 * 17.5MM
4 Road: 75 * 51 * 16.5MM
8 Road: 142 * 52 * 18MM

Module interface:
1. DC +: the positive supply (voltage relay according to the requirements)
2. DC-: negative one
3. IN: can be high or low level relay control

Relay output:
1. NO: normally open relay interfaces, floating suction before closing the relay, after the short circuit is absorbed and COM
2. COM: Common Interface Relays
3. NC: normally closed relay interfaces, COM and close the front relay short circuit, the pull vacant

High and low end trigger selection:
1. LOW when the shorting jumper is level-triggered
2. to trigger high and high jumper shorted