•DC+ : DC power supply positive pole
•DC-: DC power supply negative pole
•IN: signal triggering pin
•JD+: relay control voltage positive
•JD-: relay control voltage negative
•DC+ and JD+ shorted by jumper cap, DC- and JD- shorted with jumper cap, it is the same voltage between trigger terminal and relay control terminal.
•High and low level trigger mode selection. Jumper and L pin connection, IN pin is low level trigger Jumper and H pin connection, IN pin is high level trigger.
•Normally closed pin (NC): relay normally closed pin
•Common pin (COM): relay common pin
•Normally opened pin (NO): relay normally opened pin