OK I did a few tests with my modified CM15A.
Where I added a switch to switch the RF receiver in the CM15A Off; with the receiver ICs disable signal pin.
Cleared the Activity Monitor Screen.
Verified an RF remote was not being received or processed at all.
Close AHP.
Start AHP. Activity Monitor still clear.
Close AHP. Unplug the USB Connector for the CM15A. Reconnect the USB Connector for the CM15A. Restart AHP. Activity Monitor now shows two entries. Receive RF A Unknown. Yes the receiver in the CM15A is still disabled.
Clear Activity monitor and close AHP. Turn OFF X10nets.exe. Unplug and plug in the CM15A a few times. Activity Monitor shows no Received RF A Unknown entries.
Changed Monitored House Code but the Received RF A Unknown was the one still the reported message.
I wounder since the CM19A was added to AHP as a controller. If connecting and disconnecting the USB cable with X10nets.exe running triggers something? I have not tried anything with a power saving mode where maybe a USB port is turned on and off.
Brian -
Thanks for doing the research. I recall something from years ago (I'd have to use the "less-than-excellent" search tool here to try and find it) where a user reported all of the "status" commands that the CM15A sends when booting up, connecting to the PC, etc.
I haven't really paid attention to the Activity Monitor is a while, so I don't know if the "RF" commands I'm seeing are really from the CM15A or not.
They clearly aren't REAL RF commands, or my other CM15A would have seen them (AND your "deaf" CM15A wouldn't).
I think this is similar to the "P16 On" that we used to see at power-up, which was never usable to trigger anything from what I recall.
I noticed something VERY strange, when I was trying to figure out one of my other problems (All of my flags suddenly got flipped to "on" last Friday evening, with no indication as to how - not the first time this has happened).
I noticed that I see a pair of "Receive RF A Unknown" at the same exact time that I see the "Multimedia Class Scheduler Service" start (in the Windows system log). I am running Windows 7 pro 64-bit.
I don't know which is the cause and which is the effect, but I think the "Receive RF A Unknown" causes the service to start, because stopping and restarting the service DIDN'T cause the "Receive RF A Unknown" to show up, and I stopped the service for several hours, during which I still saw the "Receive RF A Unknown" show up at least once in the middle.
I just ran an experiment:
I opened AHP, and verified that the last command in the log was a normal one (turning off my humidifiers).
I then closed AHP.
I then opened the Device Manager, and disabled the hub that the CM15A is connected to.
I re-opened AHP, and the log now shows a SINGLE "Receive RF A Unknown" command.
I closed AHP, and opened the Windows System log, and I see the "The Multimedia Class Scheduler service entered the running state" event.
I then re-enabled the USB hub.
I re-opened AHP, and looked in the log.
I now see a second "Receive RF A Unknown" in there, at the time I turned the hub back on.
I certainly see a correlation between those commands and the USB being connected/disconnected.
However, I'm wondering how that relates to the "Multimedia Class Scheduler" service in Windows, and why my system seems to be dropping and reconnecting that device periodically.
Any ideas on this one?