BUT I have to interface 3 pairs of Tx n Rx` | Microcontroller › 8051 › Interfacing IR sensor with microcontroller › BUT I have to interface 3 pairs of Tx n Rx` December 17, 2010 at 9:32 am #5216 sikandarParticipant ? I? have to interface three pairs(Rx n Tx) of IR and I even dont know which ports to connect to !!! Can you please help me out?