... supply needed. 1, Plug and play, small volume, easy installation 2, Port-powered, high efficiency obtain electricity, can also worked on ... , GND RS-485 signal D+, D-, GND Asynchronism, point to point or multi point,2 wire half-duplex Automatic send data control, auto distinguish ... rate 300-38400bps, auto sense serial signal rate Support 128 point loopback RS-485 side 1200M (9600bps), RS-232 side less ...