Hi everybody,
I have just finished soldering COM board but have some problems when running 'Echo Test'. It read first 5 bytes correctly but after that it generate errors only. After I press Stop, Reset and then Start buttons it's exacly same story, first 5 bytes read ok, after that errors only. I checked the board visually and resolded it but the problem remains the same. I have no more ideas what can be wrong, do you have any?

Papa Sierra