Experiencing "random" no response from modbus sensor. #2446
-
|
Issue: I have provided code But it is not just a Modbus implementation, i am also using paho mqtt to send my modbus data to a remote broker. I am able to use modbus slave simulator and do not experience this issue, which leads me to believe it is he sensor that is the issue. I am reading the modbus register data from a json file. Code: Specs: pymodbus version. 3.7.4 logs: |
Beta Was this translation helpful? Give feedback.
Replies: 2 comments 10 replies
-
|
Your code is large, and not something I look into. If you have a problem then make some simple sample code that shows the problem. I am pretty sure you do not get an exception thrown but a object returned that inherits from ModbusException. You should use the isError() function after the request call to verify you got a correct response. Depending on your setup it is quite normal from time to time to get a bad or no response from your device. |
Beta Was this translation helpful? Give feedback.
-
|
This exception "AttributeError: 'ModbusIOException' object has no attribute 'registers'" is because you address .registers without having verified the response is ok. |
Beta Was this translation helpful? Give feedback.
-
|
What do you mean poor? the api signature identifies the possibilities uniquely! Apart from that pull requests are welcome. Your use of big/little endian seems wrong (but depends on your cpu). however why use the complicated payloader when we offer from/to int/float methods. |
Beta Was this translation helpful? Give feedback.
-
|
I have a hard time understanding the documentation. some others may find it easy to follow. its not a put down to you im just saying for me its poor. My apologies if my understanding of how it is meant to be understood is lacking. im just tyring to solve my own issue. what are the the use of bit and little endian was the only combination i could find to communicate with the RTU i am working with. What is "wrong" with my usage of them? how were they meant to be used? what are the methods of "to/from" int/float? i do not think i have seen these options. |
Beta Was this translation helpful? Give feedback.
-
|
What is difficult or poor in the signature read_holding(address: int, ... I do not know which documentation you refer to, our online documentation contains the signatures alongside examples of how to use the API. It's strange that you have a cpu with 2 endian encodings, normally it's either one or the other. Apart from that the registers contain integers in the format used by your cpu. If you have read the documentation you should have seen all the options. |
Beta Was this translation helpful? Give feedback.
-
|
And fyi, saying the documentation is poor, is a problem for the project, if you do not understand it, there can be several reasons. But instead of just calling it poor, submit a pull request to make it better....this is open source where you are expected to participate. |
Beta Was this translation helpful? Give feedback.
And fyi, saying the documentation is poor, is a problem for the project, if you do not understand it, there can be several reasons.
But instead of just calling it poor, submit a pull request to make it better....this is open source where you are expected to participate.