Product Description: HXSP-485 series converter is bi-directional connector converter between RS-232 and RS-485; it is mainly used for communication between main controller machines, main controller machine and SCMs or Peripherals, point to point and point to points remote communicate network, it achieve request-response communication between multi-machines, it is mainly used for the field of electricity, industrial automatic control, IC card billing system; such as one card solution, access control system, parking system, and so on. HXSP-485 series converters change the TXD and RXD signals of RS-232 serial port to 2 wire half duplex RS-485 signal. No need to get through the power, it can get the electricity from the 3rd pin of RS-232 interface , at the same time, there is a request sending by 7th pin(RTS), 4th pin data terminal prepares(DTR) to help power supplying HXSP-485. The automatically process control make you need not reset and make a easy application of the hardware and software installation. Specification & Features: Standard: Accord EIA RS-232, RS-485 standard. Connector: DB9 female on RS-232 side, DB9 male with 4 or 6 terminal block on RS-485 side. Work methods: asynchronous, point to point or multi-point, 2 wire half-duplex. Transmission medium: Ordinary Line , twisted pair cable or Shielded Wire Baud rate: 300~115000bps. Transmission distance: 5 meters (RS-232 side) and 1200 meters (RS-485 side). Communication protocol: Transparent. Environment: -10 to 85 centigrade working temperature, 5% to 95% relative humidity. Signals: RS-232 TXD, RXD,GND ; RS-485 Date+, Date-,GND .