Item Type: Data Converter Material: PVC Serial Port Characteristics: the Interface is Compatible with EIA/TIA's RS-232c and RS-485 Standards. Electrical Interface: RS-232 Side DB9 Hole Type Side Interface, RS-485 Side DB9 Needle Type Connector, with Terminal (five-position Connection). Working Mode: Asynchronous Half-duplex. Transmission Medium: Ordinary Wire, Twisted Pair or Shielded Wire. Transmission Rate: 300~115200BPS. Transmission Distance: 5 Meters / 5.5yd(rs-232 End) 1200 Meters / 1312.3yd(rs-485 End). Communication Protocol: Transparent. Working Environment: -10℃ to 85℃ Signal: RS-232: TXD, RXD, RTS, CTS, DTR, DSR, DCD, CND; RS-485: Date+, Date-, GND 1、A converter, RS232 to RS485, with a bidirectional interface between four?bit passive converters, used between main control machines。 2、A point?to?point, point?to?multipoint remote multi?machine communication network is formed between the main control computer and the single?chip microcomputer or peripherals to realize multi?machine response communication. 3、Widely used in industrial automation control systems, all?in?one cards, access control systems, parking systems, self?service banking systems, etc. 4、Four?bit passive converter, capable of converting the TXD and RXD signals of the RS?232 serial port into two?balanced half?duplex RS?485 signals. 5、Without external power supply, it can steal electricity directly from pin 3 of the RS?232 port, and request to send (RTS) by pin 7 (RTS), and the 4?pin data terminal is ready (DTR) to HXADRS232 to RS485 four?bit passive auxiliary power supply, automatic flow control so that you don't have to reset, the hardware and installation software are very easy to use. 1 x Data Converter 1 x 4-Bit Bidirectional Adapters