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[richard]

defines are set in concrete when your program is compiled ,they cannot be used to alter precompiled code at all '
if you wish to change parity or bit length on the fly you will need to write your own version of hserin/hserout

2.3 DEFINEs
The DEFINE keyword in PBP is used to set parameters for compilation and
assembly. This should not be confused with #DEFINE, which is used for
conditional compilation. Further explanation of DEFINE and how it works can be
found at the end of this section.

before you ask

The #DEFINE directive creates a compile-time constant and, optionally, assigns a
value to the constant.

[Andre_Pretorius]

Thanks Richard
Just a question from what manual did you get the quote I had a look in the manual I got when I bought PBP and it does not match, is there a advance manual for PBP ?

[Demon]

He is probably on v3 and you are on v2.6 on less (like me).

Robert

[richard]

Robert is right , the excerpt is from the pbp3 online pdf .
I had a look at my old pbp2.6 printed book and its definitely not as informative on this issue , I hope you get the concept though
any defines are set in concrete after compliation and not really expected to be alterable at runtime