OK, got it figured out.... Make sure canonical mode is not set for the serial port.
or if you're working with *nix.

This should be simple, but I cannot get any response from the keypad with my LK202-25. I have a B202A-BK, and I connected it to the keypad header. I get no response when I push anything on the keypad. Just to make sure I reset the keypad settings using the following: #!/bin/sh echo -e "\xFE\x58...

Do I have to set all of the settings explicitly? In other words, do I have to set backlight, baud, keypad, etc?

I have an LK202-25-V hooked up to an OpenWRT board running linux. The hardware initializes the serial port at 115200 baud, but the screen cannot accept data that fast reliably, so I set it for 19200 and change the baud rate once the board is booted. This means I get a bunch of gibberish at boot time...