DTECH Port-Powered RS232 to RS485 Converter Adapter for Industrial Long Haul Serial Communication Supports 600W Anti-surge and 15KV Static Protection Commercial Grade Bi-Direction RS232 to RS485 Converter used in Industrial Long-haul Communication, up to 4000ft/ 1.2 km Enabling the connections of multiple bus nodes, 32 devices can join the RS485 network Automatic RX - TX Control. Converter controls the Receive and Transmit modes automatically. Up to 115.2kbps baud rate (auto-detect) can be applied to point to point two wire half duplex and point to multi-point two wire half duplex communication. A built-in Transient Voltage Suppressor (TVS) supports 600W anti-surge and 15KV static protection which effectively guard devices from damage.