- This topic has 1 reply, 2 voices, and was last updated May 8, 2025 at 2:29 pm by Brad Weeks.
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I was woken up at 3 AM to all my keypads going offline and the Elk M1 announcing each missing. Then they came back up and all is normal. This hasn’t happened before in the 8 years I’ve had the system. When I look in the log it just says “expansion module trouble” and then “expansion module restore”.
My initial reaction is that maybe I need to replace the ELK-M1DBH Data Hub as perhaps that hardware is going bad. But maybe it could be the main control panel as well? Or perhaps some other module messing up the bus? It is also interesting that everything is acting normally again so the failure is intermittent. Any thoughts on how I should proceed?
Brad Weeks
The M1 supervises the data bus and polls for the bus devices multiple times per second. After several failed polls attempts if the device does not respond the M1 will Log A Missing Expansion Module. In the logs which device went missing? The M1DBH Data Bus Hub is a passive device with no circuitry simply keeps Data A and Data B connected in a Daisy Chain configuration. I don’t believe the M1DBH has gone bad but you could have a loose or intermittent connection, bad butt splice or bad RF45 connector. I could also be possible the M1 took a slight surge that interrupted the communication over the bus.
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