1. Have you read the PBP manuel HSERIN? Have you been reading the datasheet for MAX232? Have you been reading something about the RS232 Standard(EIA232)? If not try to search the net, here is a link to start with:
http://www.engr.uky.edu/~jel/course/.../rs232std.html
2. I'm not quite sure that I understand what you mean, but could it be a Schmitt Trigger that you are looking for?
3. How do you know that you are having a noise problem, do you have some failures that indicates noise problems?
Regards
Gert K.
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