Moxa Uport 1130 USB-RS485/RS422 Converter - compatible with USB 2.0, software selectable RS-422, 4-wire RS-485 and 2-wire RS-485, male DB9 and terminal block for easy wiring, up to 921.6kbps serial transmission, active (USB), TxD/RxD LEDs, built-in 15KV ESD protection.