I needed to add -echo to my stty call, and now the problem is gone. (This makes sense if you think about it: The lcd and keypad are like an old-fashioned terminal, and by default when you type characters on those terminals, they are echoed back onto the screen.) Here are some tips for linux users wh...

I'm sure it's a software issue, because I'm seeing exactly the same behavior on two different displays.

Any ideas on how I might fix this on the Linux side? Perhaps some stty call I can make?

I have a LK202-25-USB which I am using in Linux. I'm doing all my I/O just using bash. Everything is working correctly. However, when I poll for keypad input, I'm seeing the characters that are returned displayed on the LCD. If there is no character returned, I see ^@ on the LCD. This is the line I'...