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COM port framing errors

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  • COM port framing errors

    When running COM port loopback I am seeing "Framing Errors". Even with CTS/RTS diabled.
    What is this telling me? Stop Bits not being seen?

  • #2
    A framing error occurs when a data frame is too long or too short and can be caused by a number of things;

    • A mismatch in serial characteristics between the two devices
    • Bad cable (this shouldn't be applicable in this case if you're using our loopback plugs)
    • Bad serial port
    • Electrical noise
    • A mismatch in clocking speeds between the two serial devices


    BurnInTest will open the serial port using the settings of 8 data bytes, no parity and 1 stop bit (8-N-1). If the framing errors are occurring at high baud speeds then try lowering the speed.
    Last edited by Tim (PassMark); Jul-19-2016, 10:29 PM.

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