TCP/IP communication using Simulink- blocs (send/receive) under Real- Time Windows Target

Hello community,

I try to connect two PC using Simulink Blocks TCP/ IP send and receive. The Problem is, that I need this communication in Real- Time. I know, that this is not really possible with TCP/ IP, but if it can run under RTWT, then it would have a lower interupt mask and this would be enough for me.

I'm able to applicate the communication under the "Generic Real- Time Target" code generation. If I choose "Real- Time Windows Target", then everything is fine and i get the information:"Successful completion of build procedure for model: **"

The Problem is, that the receive- block has no Data containing and so the scope plots "0" and Matalb displays:"Warning: Simulink cannot upload data to 'sinuskurve/IP Receive' because it has no input ports". With wireshark I can detect, that Data between the two Systems is transmitted.

Now my question: Why there is no Input in the receive- bloc although there is a communication and how can I fix this problem?

I hope there is someone out there, who solved such a problem and can give me advises for my project. By the way: my Matlabversion is 2012b.

Best regards

Juri Romanez

Answer 1

[Jan Houska]

The IP Send and IP Receive blocks are not usable in Real-Time Windows Target. Instead, please try to use blocks from Real-Time Windows Target library - either Packet or Stream I/O (based on your data format) and the UDP driver.

[Juri]

Thanks for the answer. I managed to create a communication with the blocks from the RTWT library.

Sorry, that I didn't describe the whole problem. I need to communicate by sending XML- strings. The aim is, to control a KUKA robot with RTWT over RSI- XML. For that I need to send and receive XML- Data with TCP/IP or UDP.

The packet in- and output -block seems to send and receive unformatted binary data. That is a good sign. The question is: Can I send and receive char strings with this blocks? Can you tell me, if this has a chance to succeed? Or do you know, how to send char strings with the usage of this RTWT blocks?

Thanks for help.

[Jan Houska]

Use Stream Input and Output blocks instead. They are designed for formatted text data and are better suited for XML. Please see the rtstreamio example.