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).
