I have an application built using VB4/32. It uses the MSCOMM32.OCX control
to speak to a serial device. If the FIFO Uarts are set to their minimum
levels, it does not communicate with the serial device. If I break inside my
receive routine, it tells me that the message I have received is much larger
than normal(5 to 6 bytes is normal). The received message is greater than
9K. It doesn't seem to matter what I do to the control settings such as the
inbuffer and outbuffer size properties. If I set the FIFO's on the default
settings than everything works just fine.

Has anyone had any similar experiences?

Andrew Bailey

Hi Andrew,

Has anyone had any similar experiences?
<<

No.  But, I admit, that I wouldn't set the FIFO to less than the recommended
settings.  Are you doing anything unusual in your code?  Are you using
OnComm (with RThreshold = 1), or polling MSComm?  What version of
MSComm32.ocx are you using (there was a SP after the original release).

You can try XMComm (download from my homepage), and compare the results (it
uses MSComm32.ocx from VB6).  You also may be interested in my book (see
below).

Richard Grier
Hard & Software
12962 West Louisiana Avenue
Lakewood, CO  80228
303-986-2179 (voice)
303-986-3143 (fax)
Author of Visual Basic Programmer's Guide to Serial Communications, 2nd
Edition (355 pages).
For information look on my homepage at http://www.hardandsoftware.net.
Use the Books link to order.  For faster service contact the publisher at
http://www.mabry.com.