Hi all,

2 PC's, sending data back and forth via comm, using
MSCOMM, all of a sudden MSCOMM buffer no longer gets data.
Using the Portmon utility on both machines I see the data
going out and coming in the ports. The MSCOMM control no
longer gets anything in the buffer but Portmon is showing
the data coming in.

Where might I start looking for problems ? Settings ?

Thanks

Hi,

I haven't ever seen this.  I'd have to see an example.  What is your MSComm
.Handshaking property?

--
Richard Grier  (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 3rd
Edition ISBN 1-890422-27-4 (391 pages) published February 2002.

Hi{*filter*},

Good to talk to you again.

I've tried None and XonXoff. The core buffer processing is
code suggested by you, which works fine except for this
anomaly.
-------------------------
    .Settings = "9600,n,8,1"
    .RTSEnable = True
    .DTREnable = True
    .Handshaking = comNone        ' comRTS
    .InputMode = comInputModeText
    .commPort = 1
    .InputLen = 0
    .RThreshold = 1
    .SThreshold = 1
    .OutBufferSize = 1024
    .InBufferSize = 512
--------------------------
Case comEvReceive ' Received RThreshold # of chars.
  InBuff = InBuff & m_comPort.Input

  nPos = InStr(InBuff, Chr(scEOT))

  If (nPos > 0) Then
    Call subCreateMessage(Left$(InBuff, nPos))
    InBuff = Mid$(InBuff, nPos + 2)
  End If
===========================

Hi,

You need to be more specific.  What is the problem (its too hard for me to
figure out other folks code; I have enough trouble with my own)?
Especially, since they are view the problem from a state closer to the
hardware than the one where I reside.

Dick

--
Richard Grier  (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 3rd
Edition ISBN 1-890422-27-4 (391 pages) published February 2002.

Ok, I'll try...

2 PC's, 2 serial ports, 2 MSComm controls, 2 copies of
Portmon. Data is sent between each PC. Call and response.

Portmon shows the data going and coming from both PC's.

MSComm's buffer on one PC, stops recieving data. Yet
Portmon shows that data is coming in. Data will keep going
out that PC, but nothing shows up in the buffer,
regardless of what Portmon says.

The Oncomm event stops firing.

Sorry, I haven't seen this.  My experience suggests that there may be some
underlying logical (program) error.  I have applications that run for weeks
at a time without trouble.

I you are interested in consultation, you can contact me by email.  I'm
afraid that I'd have to know more, to offer more.

Dick

--
Richard Grier  (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 3rd
Edition ISBN 1-890422-27-4 (391 pages) published February 2002.