FN6201.1 ISL81387, ISL41387 ±15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers. These devices can be configured as either a single RS-422/485 differential transceiver or a dual (2 Tx, 2 Rx) RS-232 transceiver. They support both RS-232 and RS-485/RS-422 communication standards, and have many features and functions.