Pinout of IR In and IR Out:
IR In is using a 3.5mm STEREO mini-jack plug: Pinout details are: Tip - +5VDC, Ring - Signal and Screen - GND.
IR Out1 (Cable) is using a 3.5mm STEREO mini-jack plug: Pinout details are: Tip - Not Used, Ring - Signal and Sleeve - GND.
IR Out2 is using a 2.5mm MONO mini-jack plug:Pinout details are: Tip - Signal, Sleeve - GND.