Slow serial communication

[George]

We are trying an old Win 3.1/95/98 software that
communicates through the serial port with a specialized
system(National Instruments Labview). Works fine for 3.1,
95 and 98 but acts sluggish with data communication delay
indications. I have tried the roll-back feature in XP
professional with no difference. Otherwise software works
fine, just the periodic delay of up to 20 seconds for
normal once per second communication at 19,200.

[Peter Hutchison]

On Tue, 9 Sep 2003 08:41:45 -0700, "George" > wrote:

>We are trying an old Win 3.1/95/98 software that
>communicates through the serial port with a specialized
>system(National Instruments Labview). Works fine for 3.1,
>95 and 98 but acts sluggish with data communication delay
>indications. I have tried the roll-back feature in XP
>professional with no difference. Otherwise software works
>fine, just the periodic delay of up to 20 seconds for
>normal once per second communication at 19,200.

The problem is that direct access to the serial port is more
restricted in NT/2K/XP systems. The software needs to be updated to
use the OS API to access the Serial Port rather than directly.
For now, I would NOT use NT based systems for this software.

Peter Hutchison
Windows FAQ
http://www.pcguru.plus.com/