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    How-to: What does a low tone, high tone, then a 1 second pause mean on the (AEC) version 2?

    Question

    What does a repeating low tone, high tone, and 1 sec pause mean on the AEC v. 2?

    Answer

    This series of tones indicates that the CPU board is not communicating to an extension board over RS-232. Verify that the extension board connected to the RS-232 wire is powered up correctly and that the RS-232 wire is connected and wired properly.

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    Last update:
    ‎06-13-2018 01:51 PM
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