Cable Length Between Micros

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  1. - 31st May 2006, 21:28 #1
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    Default Serial Data cables

    I have read that serial cables should not be longer than 100 feet. I have read 5 volt serial data at fifty feet with cat5e. Hope this helps.

    travin
  2. - 31st May 2006, 22:51 #2
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    Thanks.

    Mark
  3. - 1st June 2006, 02:07 #3
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    Hi Mark,

    RS485 is easy to implement, pretty much like a serial port, and can go up to 4000 feet on a pair of wires. Do a search on this site for RS485 and also on Google and you should be overwhelmed with information. www.Parallax.com has a tutorial for using RS485 chips with the Basic Stamp which is a PIC chip in disguise.

    BobK
  4. - 1st June 2006, 11:51 #4
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    I'll check it out. Thanks!

    Mark
  5. - 1st June 2006, 12:25 #5
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    Point-to-Point 2km for proper RS232 and that's without line extenders...
  6. - 1st June 2006, 13:07 #6
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    Question

    Quote Originally Posted by Melanie
    Point-to-Point 2km for proper RS232 and that's without line extenders...
    Quote Originally Posted by BobK
    ...and can go up to 4000 feet on a pair of wires...
    Are you guys (and girls) saying that we can put 2000meters of RS232 cable between two PICs and expect them to see each other on the line?

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    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  7. - 1st June 2006, 14:29 #7
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    At proper RS-232 levels (not at logic levels) yes. If you use unshielded CAT5 cable then a little less. If you want more, use a line extender.
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