Boosts serial signal to extend transmission distance Wall mounting or DIN-rail mounting Terminal block for easy wiring Power input from terminal block DIP switch setting for built-in terminator (120 ohm) TCC-120I is an isolated RS-422/485 repeater designed for users who need an industrial grade interface conversion product to extend RS-422/485 transmission distance. Its superior industrial application design, which includes DIN-Rail mounting, terminal block wiring, external terminal block power, and optical isolation for system protection, makes TCC-120I suit able for use in critical industrial environments.