Serial Communication with PIC16F877A

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  1. - 27th May 2009, 07:27 #1
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    Quote Originally Posted by mackrackit View Post
    Make sure the cable is not for a modem. Pin 2 on one end goes to Pin 2 on the other, the same for pin 3.
    Did you test as Mackrackit suggested above? Many serial appearing cables are actually laplink cables, or nul modem cables and the Tx and Rx pins are crossed so two computers can be linked directly.
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  2. - 27th May 2009, 22:34 #2
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    Quote Originally Posted by Joe S. View Post
    Did you test as Mackrackit suggested above? Many serial appearing cables are actually laplink cables, or nul modem cables and the Tx and Rx pins are crossed so two computers can be linked directly.
    Yes I tested it... I successfully sent a message through my cable and echoed it back by shorting pin 2 to pin 3.... any other ideas?

    Added:

    Is there anyway to tell if my cable is crossed as you suggest?... I know I got the echo by shorting pin 2 to pin 3 but I would still get the echo if the pins were crossed...

    Resolved:

    Thank you guys for your help. After testing my cable for continuity I realized that it is crossed. Going to get a new cable and hopefully that fixes the problem.
    Last edited by mcbeasleyjr; - 27th May 2009 at 22:51. Reason: another question...

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  3. - 28th May 2009, 02:15 #3
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    Just reverse the connection at the device end, swap pins 2 and 3.
    Or cut the cable...
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  4. - 28th May 2009, 02:38 #4
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    Quote Originally Posted by mackrackit View Post
    Just reverse the connection at the device end, swap pins 2 and 3.
    Or cut the cable...
    Or if you have a null modem adapter use it to swap back . . .
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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