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+--- Thread: Modbus RTU connection (/showthread.php?tid=4676)
Modbus RTU connection - FatMax - 24.03.2023
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.
RE: Modbus RTU connection - Daniel - 24.03.2023
Why are you using USB serial interface?
Are you sure you using correct Port? Check in System - Status- System Status - Serial ports
RE: Modbus RTU connection - FatMax - 24.03.2023
(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.
RE: Modbus RTU connection - admin - 24.03.2023
Connect GND between devices.
RE: Modbus RTU connection - FatMax - 24.03.2023
(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?