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From:	"Petr Maxa" <pmaxa AT mapyoscar DOT sk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: recomend simply and good rs232 library please
Date:	Fri, 25 Jan 2002 00:13:46 +0100
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Thanks a lot for Your responze. You help me a lot.
I just wanted to hear some opinions about this matter to start tests.
It is always good to here opinion someone who has experiencies in some area.
I try one of them and let You known my results.

> By the way what is hanging on the other end of the multiport serial
> card? Does that card use 16554 or 16552s?

We use 16550, 16540 ports.
As multiport card we use Flynix - 4 ports (16540), MOXA - 8 ports (16C550)
or other.

Petr

"Andrew Cottrell" <andnews AT ihug DOT com DOT oz DOT au> píse v diskusním príspevku
news:g16t4ucm984s46r6jm9bgilpugbi2ocs2a AT 4ax DOT com...
> >I would like to hear from You a recomendation for simple but good rs232
> >library for djgpp.
> >It should be used on PC (DOS) with aproximately 8 ports and com speed
19200
> >bit/sec.
> This limits it to two as far as I know PMCOM and DZCOMM. There are a
> number of single port comms libraries and there may be a few more
> multiport comms libraries available, but I have not used them.
>
> The serial comms libraries are in the v2tk directory.
>
> >As the communication might be logged, it should be bulet proof mainly
> >because of huge amount of disk writing.
>
> I have logged over 320 MB in 15 hours on a 486 DX2-66 on a single
> serial line runnign at 9600 baud using PMCOM. I have a Data sniffer
> application in source code form that is fully self contained it
> includes PMCOM and timers (cut down Allegro to minimise exe size) that
> is available at http://homepages.ihug.com.au/~acottrel/
>
> There have been  a number of improvements and enhancements made to
> DZCOMM since I last used it.
>
> Logging to the hard drive is the tricky part as you need to way up the
> time to write a block of data, CPU usage in writing the data, type of
> H/D in respect of access time, storage buffer to save data before
> writing  to the hard drive and finally the amount of dat abeing
> received.
>
> >Where do I find such serial comms packages, and would they be for 32-bit
DOS
> >(DPMI) without MS-Windows?
> Both PMCOM and DZCOMM work on MS-DOS with CWSDPMI and under Win 9x, NT
> 4.0, 2K and XP.
>
> >I have Borland version of this program working quite well, but I am
getting
> >out of memory, so I try to look for other alternatives.
> PMCOM also works with Borland so you if you investigate using this
> then you may be able to do a staged upgrade.
>
> >I would like also to hear about other possible alternatives with 32 bit
> >protected mode system, which is reliable and simple as DOS is but runs
> >nauraly in 32 bit mode (no 16 bit switching)
> You may also want to have a look at Linux if you want to use another
> 32 bit OS, but I do not have any experience in Linux serial comms.
> There are other commercial 32 bit OS's out there, but you need to
> consider maintenance and costs.
> I would try DJGPP and PMCOM or DZCOMM first as it will be the least
> cost and time compared to other alternatives. If you don't like it
> then you have only spent time in learning what DJGPP is capable of.
>
> By the way what is hanging on the other end of the multiport serial
> card? Does that card use 16554 or 16552s?
>
> By the way PMCOM also supports 9 bit protocol (wakeup mode).
>
> Andrew
>
>

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