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Old February 16th, 2017, 08:31 PM   #3
Ken Roach
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Welcome to the Forum !

On the General communication setup tab, in the lower Channel 0 section, set the Mode to "User".

Leave the Channel 0 System Mode on DF1 Full Duplex. I think that "Shutdown" disables Channel 0 entirely.

Set the Channel 0 User Mode to ASCII and configure your speed, serial framing, and termination characters.

Now re-examine your repeating string of nonsense. It's probably because of a mismatch in the serial data rate, or the serial framing.

In general when you see mostly 0xFF, it means that the port is transmitting more slowly than you expect, so the UART is seeing mostly 1's.

What sort of microcontroller are you using ? Does it have an internal or external UART ?
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