Help configure waveshare modbus CTS_602 hmi

[Martin21186]

Hello, could someone help me set up Modbus for Nilan CTS602 HMI? I have this Modbus Waveshare, but I don't know how to configure it correctly to send data. Thank you very much

[veista]

https://github.com/veista/nilan/discussions?discussions_q=waveshare

https://github.com/veista/nilan/issues?q=waveshare

[Martin21186]

I have a problem connecting in Homeassistant. I don't know what to do anymore. Do you think it's because I don't have modbus To eth from waveshare? I am uploading my configuration. If you can think of anything else, I will be glad.

[veista]

I have a problem connecting in Homeassistant. I don't know what to do anymore. Do you think it's because I don't have modbus To eth from waveshare? I am uploading my configuration. If you can think of anything else, I will be glad.

I'm sorry, I don't understand. What don't you have?

[Martin21186]

I am using the latest ha core 2023.10.2 and your addon 1.2.7.

[veista]

You need to get your bridge to translate modbus rtu messages to modbus tcp.

If your bridge can not do this you can try editing the device.py file and change from modbus tcp to rtuovertcp mode. This circumvents getting the proper equipment. I do not support it in the integration officially, but it is possible.

Timeout means it does not work. You can try editing the settings until qmodmaster says it works or you can try editing the file.

Just install vs code addon to HA for example and edit the file located in custom_components/nilan

[Martin21186]

Can you send a screenshot of where I can find the Modbus_TCP? I tried to look for it but couldn't find anything. I also tried to set up another Modbus in the QModMaster program that I have, and it's giving me some errors, so I probably have it configured incorrectly. Do you know how to do this? When you mentioned needing a bridge, what did you mean by that? Is there something else I need in addition to Modbus? Thank you.

[veista]

The waveshare device you have might not be a "bridge" it might only be a repeater.

A bridge translates modbus RTU messages (rs485 in this case) to Modbus TCP and vice versa. These are two different protocols which the device should bridge.

If you only have a repeater (I do not know) your waveshare device will send Modbus RTU messages over TCP. In this case you have to edit the code to support this.

Easier if you edit the config_flow.py file:

Replace line: self.data.update({"com_type": "tcp"})

With: self.data.update({"com_type": "rtuovertcp"})

This way you can receive updates without modifying the file every time.

[veista]

You also have to reboot HA after the edit.

[Martin21186]

I have this one. I'll try it when I have some time. Hope this helps. Thank you
https://www.waveshare.com/rs485-to-eth.htm

[veista]

Yeah...

• This module does not support Modbus TCP, if you need to use this function, please purchase

[veista]

It wont work without the edit, it might not work at all.

[samupa]

Hello,

I have the same Waveshare Modbus repeater that sends Modbus RTU messages over TCP. I am able to read values from nilan with it, but Home assistant integration configuration fails even when I edit the config_flow.py file.

Here are my repeater settings and read values from nilan.

Here is my edited config_flow.py file.

Here is failed integration.

I am not really familiar with home assistant, but I didnt find anything from home-assistant.log or home-assistant.log.1
Is there some other log that would help?

[Martin21186]

It doesn't work with this device. I bought a newer one and it worked the first time. I also had to swap + and - for rs485.
https://www.waveshare.com/wiki/RS485_TO_POE_ETH_(B)

[samupa]

Thank you for reply.
I would have bought that one if I would have read this thread fully.

I thought your problem was between nilan and waveshare? That you couldnt get any readings from modbus. I just cant with this integration.

veista wrote this:

If you only have a repeater (I do not know) your waveshare device will send Modbus RTU messages over TCP. In this case you have to edit the code to support this.

Easier if you edit the config_flow.py file:

Replace line: self.data.update({"com_type": "tcp"})

With: self.data.update({"com_type": "rtuovertcp"})

I think its possible to use this device if integration supports RTU over TCP.

[veista]

The integration does not support it. I won't develop it, but technically it is possible. You will have to do all of the work by yourself.