The FX604 by CML Microcircuits is a Top of the line product Built with state of the art components /parts. It features a low power CMOS integrated circuit for the reception and transmission of asynchronous 1200bps data in accordance with CCITT V.23 and ETSI specifications. It is also capable of generating the 75bits/sec 'back channel'. The device incorporates an optional Tx and Rx data retiming function that removes the need for a UART in the associated µC when operating at 1200bps. It is designed to cater a wide variety of applications and I.T. design concepts. It reflects the company's reliability.