Module interface:
1. DC+: positive power supply (VCC)
2. DC-: negative power supply (GND)
3. IN: can be high or low level control relay
Relay outputs:
1. NO: normally open relay interface;the relay is suspended before the suction, and it is short-circuited with COM after the suction.
2. COM: Common Interface Relays
3. NC: normally closed relay interface;and the relay is shorted to COM before the suction is closed.
High and low level trigger options:
It is low level trigger when jumper connect to LOW pin
It is high level trigger when jumper connect to HIGH pin
Package includes: 10PCS 1 Channel 12V Relay Module Board