... and play, small volume, easy installation 2, Port-powered, high efficiency obtain electricity, can also worked ... automatic transmit Support EIA RS-232, RS-485 standard RS-232 signal TX , RX, GND RS-485 signal D+, ... from TXD, RTS, DTR signal in RS-232 port Consumption: Static consumption less than 20mA, dynamic ... Plastic Color: Black Weight: 50g RS-232/485 Converter(Industrial Port-Powered Isolation )