... powered ultra_high speed, baud rate up to 460Kbps, transmission distance up to 1200m Features:1) RS-232 To RS-485 Interface Converter with ... electricity stealing technology, need no external power supply, real three line (TD, RD, GND) mode communication8) Communication speed: 0- ... Closed circuit monitoringe) Security protection systemf) Intelligent card, check on work attendance gate safety system