DTech Industrial Grade Port-Powered RS232 to RS485 Converter Adapter Optical Isolation Protector with TX/RX LED Lights for Industrial Long Haul Serial Communication 2.5KVrms /500VDC photoelectric isolation voltage help you get the precise data and prevent your valued devices from damage. 600W double lightning surge protection and 15KV static protection protects your value devices against high voltage spikes created by either by static electricity or by surges in the supply voltage. TX and RX indicators enables you to easily know the status of sending or receiving data respectively. Supports 2 wire half duplex communication, point to point and point to multi-point network (up to 32 RS-485 devices). The baud rate will be detected and adjusted automatically, up to 115200 bps. Its port powered from RS-232 signal, no external power required.