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    How to troubleshoot No Acknowledgement Received Message from C900V2

    Question

    The central station received a message of No Acknowledgement Received, which may have been shown as X71 in 6500 mode or NYU0001 in SIA mode. What causes this problem with the C900TTL-E or C900V2 module?

    Answer

    The message indicates that the C900 module relayed the message to the central station receiver, but the panel has not responded to the acknowledgement request (kissoff).

    • Check the dip-switch settings for the communication format.
    • Verify the communication format is correct on the C900, and the same communication format is selected in the panel.
    • Verify that the C900 firmware version is compatible with the selected communication format (see C900 module's installation manual for a compatibility list).
    • Check the panel itself for a potential issue, such as a phone cable, ground fault, or power problem.
    • Verify that the C900 module is getting minimum voltage required, 12 to 24 volts DC.
    • Ensure that the power supply for the C900 is a dedicated source of filtered DC voltage, and it can supply enough current for the C900 module (~280mA).
    Version history
    Revision #:
    2 of 2
    Last update:
    ‎06-12-2018 05:53 PM
    Updated by:
     
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