Converts RS-422, and both 2-wire and 4-wire RS-485 RS-485 automatic data direction control Compact size / Automatic baudrate detection Built-in 120-ohm termination resistors / LED port power indicator External power source supported but not required MOXA TCC-80 - Port-powered RS-232 to RS-422/485 Converter with 15 KV Serial ESD Protection and Terminal Block on the RS-422/485 Side