I am providing the LK204-25 with an initial string of:

254, 88, 254, 69, 254, 80, 210, 254, 79, 254, 75, 254, 84, 254, 70

Then during a loop I continuously poll the keypad buffer about once per second with:

254, 38

All works great! :)

But if I turn the backlight on (254, 66), the PICmicro MCU ...

I have a LK204-25 with a keypad connected to the keypad connector. I am using a PICmicro MCU to communicate with the LK204-24 via RS-232. I have "Auto Transmit Keypresses Off" as I am using the "poll keypad command" to retrieve the buffered keypresses.

The problem I am having is that with the ...