Communicate with modbus RTU via vb.net

Posted on 2015-01-16
Medium Priority
Last Modified: 2015-02-19
I normally use Mitsubishi PLCs and have all the code to open and close communication lines, read and write data to and from vb express 2010.

I recently bought a Modbus RTU unit and would like to be able to do similar basic tasks from vb.

Has anyone an example of vb.net code that actually works.  There are quite a few snippets on the net but I cant find any that work.

Thank you in advance
Question by:SweetingA
  • 2
LVL 15

Expert Comment

ID: 40554569
I tried to write a Modbus RTU class in VB for work, and although I was able to get a simple program that would respond to a single message it was no good in our application as it would not work in an environment that had multiple messages respecting the 3.5 character lengths between messages. In the end we bought a vb.net plugin. Is the unit a slave, and you want to be a master to communicate to it, or vice versa?

Author Comment

ID: 40555112
I have also bought a plugin as i became super frutsrtated.

I bought msbus.dll but it i can't identify where to put it so that i can pick it up in in my toolbox.

Any advice would be most welcome.
LVL 15

Accepted Solution

ChloesDad earned 2000 total points
ID: 40555134
You need to add it as a reference to the project.

Right click on the project and select properties, then click on the tab for references and add it there. You should then be able to either add it to the toolbox or create the control at runtime.

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