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 For more details on product, Please refer to http://www.papyrus.co.il/h_rs-232_to_rs-485_converter.htm