Help with serial communications

[Paulo J. S. Jabardo]

Hello guys

I've written a program in PBDOS that does serial communications
with a data logger. The program works great but I'm trying to
convert the code to PBDLL60 using the new COMM commands. I have
had a few problems with that.

To establish the connection, in PBDOS I use:

FN = FREEFILE
OPEN "COM2:9600,N,8,,cs,ds,cd" FOR RANDOM AS #FN

In PBDLL60, when I try to set: COMM SET #FN, CD = 1 I get the
compile time error 542: Value may not be altered (the same thing
happens when I try to modify RLSD)

Can any one show me how to convert the above PBDOS code to PBDLL60?

Thanks a lot for any suggestions.




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[Edwin Knoppert]

You need to reread the help.

Use Comm OPEN instead..

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[Paulo J. S. Jabardo]

Sorry, I think I didn't mak e myself clear. I've read the
help file thoroughly. The first piece of code is the PBDOS
code.
In PBDLL60, I use something like this (I don't remeber exactly
since now I'm home not at the office)

FN = FREEFILE
COMM OPEN "COM2" AS #FN

COMM SET #FN, BAUD = 9600 'OR CBR_9600
COMM SET #FN, BYTE = 8
COMM SET #FN, STOP = 2 'And I've tried every other possibility
COMM SET #FN, PARITYTYPE = 0 'None
COMM SET #FN, CTSFLOW = 1 'CS option in DOS
COMM SET #FN, DTSFLOW = 1 'DS option in DOS
COMM SET #FN, CD = 1 'The code won't compile unless I comment out this line. If not, I get error 542


Probably I'm missing something very stupid and any help in

converting the PBDOS code
OPEN "COM2:9600,N,8,,cs,ds,cd" FOR RANDOM AS #FN

is welcome

Thanks guys

Paulo


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[Jim Huguley]

paulo..

from: http://www.powerbasic.com/support/pb...hread.php?t=43

19. comm set
errata applies to pb/dll 6.0 & pb/cc 2.0
comm set incorrectly suggests that it is possible to programmatically alter the cd and rlsd parameters - in fact, cd and rlsd are read-only parameters. attempting to change these parameters with comm set will yield a compile-time error 542: may not be altered.

to check the value of cd (or its synonym rlsd), use the comm() function.



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jim..
[email protected]