RS 485 to RS 232 pin numbers

Discussion in 'Computing and Networks' started by leo v, Jun 18, 2011.

  1. leo v

    Thread Starter New Member

    Jun 18, 2011
    2
    0
    Hey.

    Ill keep it simple.

    I have a RS 485 Signal on a twisted pair i want to convert to RS 232

    I have a RS-485 to RS-232 converter which will plug into the com port on my PC.

    However i must make up a 9 pin (DB9) connector to plug into the convertor.

    Which 2 pins should i solder my RS 485 signal onto on the DB9 connector?

    Cheers
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,414
    3,353
    You need to supply the model number of the converter. There is no standard pinout for RS-485 on DB9.

    You can find out more about converters at B&B Electronics:

    http://www.bb-elec.com
     
  3. leo v

    Thread Starter New Member

    Jun 18, 2011
    2
    0
    Thanks very much.

    I have found the datasheet for my specific converter and it appears that pins 3 and 8 are being used for the twisted pair Rs485.
     
  4. Alberto

    Active Member

    Nov 7, 2008
    169
    36
    DB9 pin 2 & 3 are for Rx and Tx. You will need to use RTS (pin 7) to control direction. You can short pin 7 & 8 (RTS & CTS) if handshaking is needed.

    Cheers

    Alberto
     
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