Well the sensor should log everything.
If you send the command from the cli in home assistant do you get a response?
No I don’t get a response in the SSH terminal within HA although I’m using the same echo command I used to send a command to the screen (with a different hex code) and I didn’t think echo commands showed responses…
Yeah ok.
Are there any terminals installed, picocom, minicom, socat?
If not you could try this:
echo -e -n '\x7E\x30\x30\x30\x30\x20\x31\x0D' > /dev/ttyUSB0 & cat -v < /dev/ttyUSB0
echo command cannot read back the response, check the thread I posted above. I think we discussed it there.
But its true that the sensor should read the response. However, despite what I sent, the sensor remains empty as for you
but I could read the responses with some utilities for hex commands, so the projectors sends back the response on the serial line
Which is why I added this on the end:
... & cat -v < /dev/ttyUSB0
It won’t help with your command, but I wanted to test if you are receiving anything in home assistant. It should redirect the received serial data to the screen.
I receive number of “F” on every row. So there is a development. Expected response should be “Ok1” for powered on “Ok0” for powered off
Try that using COOLTERM https://freeware.the-meiers.org/
The author, Roger, was in touch with me over an email and tried to figure out the command. We were not successful, probably due to my limited knowledge, however, I used the utility to be sure the command works as it should. It will shows you the proper returns. I will do the same and we can compare results