Serial Communication with PIC16F877A

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  1. - 27th May 2009, 22:34 #15
    mcbeasleyjr's Avatar
    mcbeasleyjr
    mcbeasleyjr is offline Junior Member
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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...

    Morris Beasley
    Manufacturing Test Technician
    B.S. Industrial Technology (2007)

    For more information on our robotics, please visit:
    http://www.ish-electronics.webs.com
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