Serial control issue with LG 60PS60 Plasma

fogled@mizzou

Just installed an LG 60PS60 in a conference office. Yeah, I know, "Largely Garbage" and all, but it turns out this was the best fit I could come up with for this installation. Until I start testing unit control...

I've got command-response buffering with a currently 3-second response timeout, and what I'm seeing is that every so often, the display simply ignores a serial command. No ACK or NAK, nothing. The next command after a dropped one always works OK.

I've *almost* gotten rid of the problem by adding some additional wait before sending a next command. I've tried both a half and full second delay after receiving a response from the display. I can't tell any different between the half and full second waits, but it does get worse if I take that wait out completely.

I still get dropped commands occasionally and randomly, and I can consistently reproduce a dropped command if I send commands in a specific order: Set Input 1 (CATV), Set Channel, Set Volume, Set Aspect. If the first 2 are in that order, it will consistently drop the 3rd command no matter what it is.

I'm getting around this by re-issuing dropped commands, but that with the built-in wait makes the switching seem really slow and clunky.

Any advice?

Thanks!

Diogo

Try send before every command a $0D, I did this in one LG Plasma and everything started to work.

Another thing, see if you're using the right baud rate, in another LG Plasma, the manual says 9600, but I used 115200,n,8,1 and works fine.

fogled@mizzou

Diogo wrote: »

Try send before every command a $0D, I did this in one LG Plasma and everything started to work.

Another thing, see if you're using the right baud rate, in another LG Plasma, the manual says 9600, but I used 115200,n,8,1 and works fine.

Good ideas, I haven't tried either. The manual does specifically say 9600,n,8,1,n; I would have tried another baud rate but I can't find the setup for the serial port in the menu.

Diogo

They have't a baud rate setup, i was only receiving back a bunch of FFFFFFFFFFF

But if in 9600 is replying that's ok

fogled@mizzou

Diogo wrote: »

They have't a baud rate setup, i was only receiving back a bunch of FFFFFFFFFF

Interesting. When I very first hooked up to it, I got all $F0$FF crap back too. But I thought my cabling was tweaked so I had a round of re-terminating the serial before I finally got a good response off the serial. I wonder if my cable was OK the first time, and if I had jacked it up to the higher baud it might have worked?

Curious.

fogled@mizzou

I'm out here now, just tried the extra CR after receiving a response. That doesn't help. Still get dropped commands.