Industrial RS-422 / 485 converter / repeater, optional with 2kv photoelectric isolation protection TCC-120 and TCC-120I is RS-422 / 485 serial port converter / repeater designed to extend RS-422 / 485 transmission range. Both are of superior industrial design, including rail-mounted, terminal wiring, and can be powered by external power supply terminals. In addition, the TCC-120I supports photoelectric isolation protection. Tcc-120 and TCC-120I provide an ideal RS-422 / 485 converter / repeater solution for critical industrial applications.