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12V 4-Channel Relay Module With Optocoupler High Level Triger For Arduino


Input section:
VCC: positive power supply (by relay voltage power supply)
GND: power supply is negative
IN1: 1 signal to trigger the end of the relay module
IN2: 2-way relay module signal trigger terminal
IN3: 3-way relay module signal trigger terminal
IN4: 4-channel relay module signal trigger terminal
Output section (relay output):
1, normally open 1-4: Relay normally open interfaces, relay before floating, pull back and Public shorted
2, common 1-4: Relay Common Interface
3, normally closed end 1-4: Relay NC interface and relay shorted before the public, after the pull-vacant
Trigger terminal requirements:
Signal as the trigger terminal phase with the other modules, to ground (power supply negative) between the two modules connected together to be effective, if a common power supply, you can connect a separate signal line on it

Package included:

1 x 12V 4-Channel Relay Module

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