Many thanks richard.
Take care.
No code error , no compiler deficiency. as suggested in post #9 its wired incorrectly
who would have known
Warning I'm not a teacher
Specialy when the GM65 user manual mention TTL logic level, yes the DC supply is 5V, for the USB / UART ports.
but it's not specify 3.3V Tx/Rx output line.
Learning everyday like everyone here.
Bookmarks