IRR01 has no ground connection, the two wires are 12V and IR These connect any input on a RIO 12V to 12V centre common and IR to an Input
Correction
IRR has 12V, GND and IR pins
12V is connected to 12V on RIO
GND is connected to Input COM (Common) on any RIO Input terninal block (shared by 2 inputs)
IR is connected to any Input of the RIO
But IRRo1 have 3rd wire GND , i read this in RIO module & IR dome .
this what i read in the Module
(IRR01) to receive Comfort Infrared Codes or X10 IR codes (from theX10 IR/RF handheld remote control UR24). The IRR01 IR receiver isconnected by 3 wires to the RIO; 12V, Ground, and IR. The IRR01 can
Each Input on the RIO can be connected to an Infrared Receiver