You can read previous comments to see how other people solved the same problems as yours. I also uploaded here the S275's; 1. So it would be nice to read the message. I think everybody who works with Modbus has to solve this… So there should be a common way to do it. I was expecting ur reply tomorrow. Thank you for your great work! This is a real problem that may require my client to walk away from the software altogether.
Is there a recommended way to close the client ports? I used your code and I got the expected message. This makes porting to new platforms easy. So as my analyze hardware already configured with Modbus communication. Another alternative is to re-write one of the Java drivers into C. This is the only library that I have heard of that targets.Next
Sorry for my questions, I really could not make it work! Mesta, The above articles talking about Serial Port or TcpClient 127. The controller is a Protocol3. Engineering Engineering and workplace issues. Meaning it has to be connected with our manufacturing system where we can automate and control. Right now, I'm trying to figure out if FreeModbus on SourceForge is what I'm looking for.Next
What other parameters do I need to know? To develop an asyncronous communication you need to have a thread dedicated to polling the modbus device. Hello Mesta, I have read forums entries here from 3 years ago. A lot of functions is backing you up to accomplish different tasks or configurations. I can't even get a custom build working with the demo because they lock it off. Also learn little bit about Wireshark which may be of great help finding out problem in your code initially. If a frame is complete it is passed to the Modbus Application Layer where its content is inspected. Please tell me which function I have to call for the following scenario.Next
I wrote this to collect the data and write into Excel cells. Thanks so much for replying, that is similar with what I want. Perform easily Modbus master or slave device functionality in your application written for example with C++, C , Delphi, Pascal, Visual Basic incl. As far as licensing goes, it is free to use as desired but the source code is not provided. The master sends out requests which the slave node s reply to.Next
You need to use a serial port sniffer to debug modbus problems. Can you please help me in this? Example Code: Other Important Documents: : This describes the full Modbus Protocol. The method linked to this event handler is supposed to remove the master and close the socket, but it is not being called. Then you connect a working device and you check again what is the request from the working device and what is the reply. If I manually close the masters, they are closed, but the event handler created when the connection was first made is still active and polling, so the software immediately throws the exception and kills my software.Next
Whatever way you decide to go, I would suggest that you figure out how your overall program is going to work before deciding that one or other of the possible solutions will work for you. The drive supports both protocols. Many of the solutions proposed within this thread were very promising, and I've revisited them. However, the error popup when I try to read the address with 2 or 4 bytes number start address and read the length of data as 2 or 4. I have not used it, but looking at the site and the on Google Code, it looks pretty active.Next
Net, you can check a working hardware configuration sample in this thread: this has been tested. So, when I open the script, I feel a little bit confuse. I am running code as-is without any alteration. But it would be possible just to wait some time till it is not busy anymore and then close it. Projects built with a Team Edition license generate an embedded runtime license which is embedded into your executable assembly. It just timed out if I set read time out value on my port. The background for the question is that I found the S7.Next