is strange that happen,
look, I have my subroutines in another file called "subs.bas", When I compile the main file called "main.bas" I call the subs file, (include "subs.bas"),
compile ok but... doesn't work! (no send data over serial port)

when I compile without (include "subs.bas"), it Works!.
Why? I am confused...

then I comment ALL lines file subs.bas, for ensure that these code doesn't take part of program memory, doing this still doesn't working...

at least I put the two files to form one single, compile it and voila! its working
I don't understand that happen....