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I have a simply application. TRB145 is a gateway between Modbus TCP client(Master) and RS485 RTU device(Slave). The problem is that frame received from client is send to the slave device, slave is making correct response, but the response is not send back to the TCP Client. Below is a communication diagram:

Here is the configuration of RS485:

Firmware: TRB1_R_00.07.00.1_WEBUI

In the attachement backup configuration of teltonika (admin password is: Zapsoft1)
and modbus log from Modbus Poll (TCP Client) and Modbus Slave (RTU).

Is there any way to log communication on RS485 (in Teltonika)?

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Please let me know if it is a hardware problem or a configuration issue.
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Hello, dareksm,

Thank you for contacting us.
In order to avoid any misunderstanding, I would like to ask I understand correctly: is TRB145 are a gateway and device behind it is a slave?
Also, I would like to ask to generate a troubleshoot or a backup in order to check configuration and what cause the issue.
At the moment, I could not see any added attachment with this post.

Best regards,

Sigitas

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That's correct - TRB145 is a gateway and device behind it is a slave.
I resent attachments to the google drive:
https://drive.google.com/drive/folders/1kjk1erCxbCn5NJqLRBIxX5ChZo7nxOw_?usp=sharing
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Hello,

Thank you. I will check them and inform you directly with private message.

Best regards,

Sigitas
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I'm still waiting for the answer...
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Hello,

Please check your message inbox.

Best regards,

Sigitas