Posted on May 17, 2011 at 15:09Found the problem. The hardware circuit have some issues. Use another tranceiver outside and directly connected to port A pin 4 & 5 and it has no any problem to communicate with hyperterminal. Albert 

Posted on May 17, 2011 at 15:09I used the scope watch the tx pin, I saw there is data sent to the pc, but why the hyperterminal didn't show any ASCII, I am sure the setting for hyperterminal is correct. and I used the following baud rate setting for...