Impedance

Discussion in 'General Electronics Chat' started by dileepchacko, Jan 11, 2009.

  1. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    Dear All

    How I can calculate the impedance of the wire having the length of 4000ft. This cable is using for RS485 communication.
     
  2. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    The characteristic impedance of a cable has to do with it's construction type rather then it's length. Normal specification for RS-485 type communication cable is 120 ohms.

    Here is a good application document for wiring of RS-485 circuits:

    http://www.maxim-ic.com/appnotes.cfm?appnote_number=763&CMP=WP-1

    Lefty
     
  3. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    Thanks a lot leftyretro. I got some useful information.
     
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