Thanks you very much, Marty and olivier for your feedback (no pun intended :-);
Hmmm, for some reason my TV does seem to cooperate. Feedback (i.e. response to 'FF") is not working as it should.
Here is a portion of the Docklight script log I created during testing:
- Querying power seems to work.
- Mute does not work at all
- Input (HDMIx): querying seems to work fine if the input is HDMI1, but for all other HDMI inputs the query has to be sent within a few moments to get a valid result. If waited a bit too long, the reply is an error message.
Signal path is [CP3] - IP - [Digi PortServer TS 8] - RS232 - [C8].
The PortServer has been rock solid for years, controlling all sorts of different AV gear on its 8 ports.
I retested with Docklight communicating with the PortServer, instead of the CP3, but got the same poor results.
The feedback I receive is reproducible and also not some gibberish, so I believe the physical return channel is OK.
Therefore, I suspect the problem resides with the TV itself (firmware? TV should be on the latest one). Is there some setting in some secret service menu I need to activate?
I have since opened a ticket with LG support. I am curious to find out what they have to say.
Maybe you guys have any more thoughts on this.