Does not make any difference. Any other ideas?

Thank you for that information. I isolated one issue to the mcu not releasing back to the idle state on stop.

Doing a quick read on the keypad now returns all the correct information, so things almost work.

Any read that utilizes a command still does not work. I had already been disabling rs232 ...

If you are new to i2c, double check that your i2c pins are all going the right direction (set as outputs), that your freescale is set as the i2c master, and that you have your SCL and SDA lines idle at the right state.

I am having a problem verifying the correct read sequence for the LK204-7T-1U series display.

My other i2c devices are all fairly similar in behavior:

[start][write address][A][command][A][start][read address][A][READ DATA][NA][end]
or
[start][read address][A][command][A][READ DATA][NA][end]

The ...

In case someone else is looking or wondering.

What I did was moved the 0Ohm jumpers to the I2C location and placed a couple of 1K5 402 resistors in the location below the jumper box.

I believe that it is possible Matrix had intended to assemble these two resistors originally and then changed ...

The manual covers all the information to change the jumpers, that is simple enough.

The problem is: are the four pads under the I2C jumpers for the 1-10K pullups required? Something is obviously needed there as they interrupt the traces to the bottom side of the I2C jumpers.

This would not be ...