Hello Ralph,
I would check the communication parameters:
1. Have you got the right USB port (the same as for uploading the HEX file). I suspect you have that right as it reads one byte, but please double check.
2. The parameters are 38400, None (for parity), 8 (bits data), One (stop bit). This is different to the programming settings as it communicates with the CAT section of the uploaded program.
73, John (VK2ETA)
