Hi I have Siemens inverter MICROMASTE 440. Does anyone have experience with communicating with this device via the USS protocol on RS485?
Hello Lucia,
You can use the DVFrame library to send data serially over the RS485 interface on a B&R CPU or remote IO module. This would require you to build each command in your code according to the Host Communication Protocol in the Siemens USS Protocol Manual (siemens.com).
More information and examples for using the DVFrame library can be found in the AS help under Programming > Libraries > Communication > DVFrame or this link DVFrame - B&R Online Help (br-automation.com).
-Ryan
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Thank you very much for the answer. Yes, I know all this. I also have the pdf with that communication. My question was more focused on whether someone could help me with this particular device. I mean specifically how the telegram should look and what to set on the given device. What I’ve managed to do so far is to set this up:
I used the DVFrame example and the Receiver specifically FRM_Read is in the listening state. But I failed to send a telegram in the correct form. I have no error with FRM_Write.
I tried different forms of telegram but I can’t find the right one. The next thing I can’t find is how to set the parity, but I also tried to set them all and the result is still the same.
Hi Lucia, what is status of your topic, have you found solution?
Yes, my colleagues and I managed to find a functional solution.
ok and can you share with us description of your solution? or maybe sample code? 
We plan to put it on Confluance, but we want to edit it into a better form. It’s still only about one specific converter, but I believe that explaining that message could help someone in the future. If I have any update I will post it here. Hopefully, before the holidays, things will be freer regarding projects.
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