... RS232/RS485 from/to Fiber Optic Series Converter/Repeater RS232/RS485 from/to Fiber Optic, Converter/Repeater Fiber Optic to RS232 to RS485, Optic fiber devices, RS-485 ... , TXD, GND 3-line approach to work;RS422 support for RX-, RX +, TX-, TX + full-duplex mode;RS485 support for A, B ...