Suggestion for Modbus control?

28 Jun 2009 9:38 AM

John Dann

Can anyone recommend a cost-effective Modbus control for use under
..Net?

Requirements are very simple - I just need to be able to read a few
Modbus registers from within an application, so nothing elaborate
needed at all. But because it's just a small part of the app, I don't
want to spend more than is strictly necessary. I'm guessing that
there's nothing free (haven't been able to spot anything anyway) but
low cost would be very appealing, provided the control is reliable.

JGD

29 Jun 2009 11:32 PM

Tom Shelton

On 2009-06-28, John Dann <n***@prodata.co.uk> wrote:

> Can anyone recommend a cost-effective Modbus control for use under
> .Net?
>
> Requirements are very simple - I just need to be able to read a few
> Modbus registers from within an application, so nothing elaborate
> needed at all. But because it's just a small part of the app, I don't
> want to spend more than is strictly necessary. I'm guessing that
> there's nothing free (haven't been able to spot anything anyway) but
> low cost would be very appealing, provided the control is reliable.
>
> JGD

Here is some C# code from code project:

http://www.codeproject.com/KB/trace/modbuscs.aspx

A quick glance suggests they are just using the .NET serial port stuff, and
then implementing the protocol on top of that. Anyway, maybe it has what you
need in there :)

--
Tom Shelton

30 Jun 2009 5:49 PM

Dick Grier

Tom's suggestion is fine. Translating this to VB should be straight
forward.

AFAIK, it should work with no problems, but I don't have any MODBUS hardware
to work with right now.

Dick

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.