Rs232 Hex Char

[Charlie]

Hi to all

To this time i have some troubles to send some
Hex chars. I'm using a 16f628a, 9600 bauds
Most of the chars print whitout troubles however
Chars $04, $40, $A2, $D6,$13 don't work, on the terminal shows 00 or empty. The serial configuration as fine. But i can't understand the reason. The realterm software and pic are setting properly. I aprecciate any advice about this issue.
Best Regards

For starters, most of these are either control codes (which don't print anything), or codes that don't exist in ASCII at all (anything bigger than $7F). The only exception is $40 which is "@" . Are you sure that one does not print?
What were you expecting to happen?