MAX242 5V RS232 transceiver with shutdown. +----------+ /EN |1 +--+ 18| /SHDN C1+ |2 17| VCC V+ |3 16| GND C1- |4 15| T1out C2+ |5 MAX 14| R1in C2- |6 242 13| R1out V- |7 12| T1in T2out |8 11| T2in R2in |9 10| R2out +----------+ [This information is part of the GIICM]