1. General
   KH-485 is the interface converter of the signal transform between RS-232 and RS485. The converter gets the feed (power supply) directly from the serial port of the equipment (such as computer COM) without external connecting the power supply. The converter, with high sensitivity and stable performance features, adopts DB9 needle universal serial interface and is used widely in electric system, industrial automation control and IC card charging system. It is a high performance-price ratio data interface converter.
2. Function and Feature
   a) Can change RS-232 data sending (TXD) and data receipt (RXD) signal to balanced semi duplex RS-485 signal.
   b) No need external connection power supply and can get the feed /power from RS-232 port.
   c) Point to point communication
3. Performance Parameter
   Port/interface: compatible EIA/TIA RS-232C and RS-485 standard
   Transmitting Speed Rate: 0-115.2Kbps
   Transmitting Distance: 1.0 Kilometer (RS-485 port), 5meters (RS-232 port)
   Working Ambient: -40℃ to 80℃，relative humidity: 5% to 95%
4. Pin Definition
   1) RS-232 port (DB9 female/hole pattern) Pin Definition

      2)RS-485 port (DP4 screw crimpling type) pin definitio

  5.Instruction
    KH-485 connects with RS485 interface equipment (signal converting function)
    RS-485 port (screw crimple type) RS-485 interface equipment
    485- --------------------------- Data-
    485+ --------------------------- Data +
    Note: RS-232 port (hole type) of KH-485 converter directly connect computer COM1/COM2