... ,600bps, no external power needed,optic electric isolation 3kV, applicable in tough environment. Four line communication. Transmission distance at 9,600bps ... power supply needed, powered from TXD, RTS and DTR signal in RS-232 port14) Consumption: static consumption less than 10mA, dynamic ... 16) Shell: plastic 17) Color: white 18) Weight: 30g RS232 Repeater-Model232D