... Optic to RS232 to RS485, Optic fiber devices, RS-485 Repeater, Series Multi-drop Optic Fibres, Serial Converters for ... support for RXD, TXD, GND 3-line approach to work;RS422 support for RX-, RX +, TX-, TX + ... mode;RS485 support for A, B half-duplex mode;RS422/485 Rate: 0-2M (optional 500K, 1M, ... 5M, 10M);Protection: RS422/485 with 600W sursge protection also has overload protection ...