I have been using this program for about 8 years , it is by far the best RS232 terminal program i have ever used.
You can save serial string in files and call them back for testing.
its a great debugging tool
Note
to send a HEX string you send like this
$04$03$0D
Ascii like this
Test
Ascii with hex terminator
test$0D
Enjoy
[Link: sites.google.com]