PLANET ICA-HM127 - Manual (Page 11)

Terminal block for I/O connectors:
10
Interface Description
D+ RS485 signal positive (+)
D- RS485 signal negative (-)
GND Signal ground
DO Digital Output #1
DI1 Digital Input #1
DI2 Digital Input #2
AC24V- AC 24V power input negative (-)
AC24V+ AC 24V power input positive (+)
To insert or release a wire, press the button of the PIN you wish to insert or release.