The E2191 Serial to IrDA Transceiver is an easy to use module converting between a CMOS/TTL serial signal and an IrDA optical signal. The module formats the serial data to the IrDA standard for both transmit and receive. Simply send serial CMOS/TTL data to the Transmit Input or read serial CMOS/TTL data from the Receive Output. The baud rate is loaded on power up or by resetting the module, and is selectable between 9.6K or 115.2K baud. Operation is from 3.0V to 5.5V. The optical power level is selectable between low and high to allow operation at different distances.