The MSCOMM control does allow individual control of the discrete serial
port signals (CTS, RTS, DTR, etc - only outgoing, of course).

I know it works - when I needed to listen in on communications between a
computer and another device I used two serial ports on a seperate system
running a VB program.  It detected and shuttled not only byte
information but also the status pins toggling - the device I was using
didn't run without proper use of these signals.  You need to tell the
control that the communication should have no flow control (as opposed
to hardware or xon/xoff) so it doesn't automatically toggle them for you.

I probably still have the program and source around here somewhere.
 Never did get it on my website.

-Adam

Tim McDonough wrote:

>On Fri, 26 Jul 2002 12:00:13 -0500, Richard Mellina wrote:
>
>
>>MSCOMM is an Active X control that allows you to send and receive
>>data via a PC's serial port. It comes with VB6 Enterprise and
>>Professional. If you have the Learning edition a MSCOMM clone is
>>availed for download free of charge at
>>http://ourworld.compuserve.com/homepages/richard_grier/xmcomm.htm
>>
>>
>
>I have the Enterprise edition. The MSCOMM control does not allow you to
>manipulate or test the individual port lines. In my application I
>programmed lines to control the programming mode as well as provide
>clock and data signals for the programming protocol.
>
>
>
>>I have played around with WIN95IO.DLL which is also free. Info on
>>using it to control a parallel port is available at
>>http://www.aaroncake.net/electronics/vblpt.htm
>>
>>
>
>I'll give that one a look but now that I've bought the other and it
>does both port types it may be harder to change!
>
>Thanks for the pointers,
>
>Tim
>
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