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Logic Machine Forum › LogicMachine eco-system › Gateway v
Modbus RTU connection

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Modbus RTU connection
FatMax Offline
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#1
24.03.2023, 11:05 (This post was last modified: 24.03.2023, 11:06 by FatMax.)
I have an issue with at modbus client when connecting it to a Wiser.

The client is a Systemair Save 250/B.

In my attempts to solve the issue I purchased a USB to serial interface and was able to connect to the client with the help of the PC software from the manufacturer. 

I connected the corresponding cables to the Wiser and changed the RTU settings that was successful on the software. However, I am getting operation timeout when trying to get data from the client. 

I do not have a 120ohm resistor connected. As the installation is an hour away; Do you think this is the solution to the problem in this case? The cable from Wiser to client is 1.5 meters.
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Daniel Offline
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#2
24.03.2023, 11:10
Why are you using USB serial interface?
Are you sure you using correct Port? Check in System - Status- System Status - Serial ports
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Ctrl+F5
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FatMax Offline
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#3
24.03.2023, 11:13
(24.03.2023, 11:10)Daniel Wrote: Why are you using USB serial interface?
Are you sure you using correct Port?  Check in System - Status- System Status - Serial ports

Since I was unsuccessful getting response through the Wiser I decided to test the connection directly from my laptop to the client with the interface. Worked fine.
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admin Offline
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#4
24.03.2023, 11:13
Connect GND between devices.
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FatMax Offline
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#5
24.03.2023, 11:28 (This post was last modified: 24.03.2023, 11:29 by FatMax.)
(24.03.2023, 11:13)admin Wrote: Connect GND between devices.

Forgot to mention that, but did that as well.

A CAT6 cable was put in place by electrician. Might that pose an issue?
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