SSH Troubleshooting modbus_client

[Zonk1988]

Hello everyone,

I have Trouble with my modbus client configuration because iget
lots of failed connections in the modbus status. But i need more information or errorcodes of the modbus_client.

I would read the event log over SSH with command: logread -f | grep client_modbus but nothing shows up . Now to my question is there a special log file for the modbus client or is my command wrong ?

FW 07.14.03

Best Regards
Chris

[minecraft_creeperis]

hi,

system → maintenance → troubleshoot → download

open the file → system.log

[Zonk1988]

@minecraft_creeperis

system.log

This worked but i seek for specific modbus errorcodes. Because there are many failed connection of one device. so i want an errorcode or function code when the modbus client enables an connection and try to poll the values. In don’t find some modbus poll log in there. MFG Chris

[Matas]

Hello,

The command modbus_client -D <debug level number> should allow you to view the logs.

Regards,
M.

[Zonk1988]

Hello MatasR,

Thanks for the fast answer. I must first seek the debug level number that you can enter because I had never seen this bevore. However, this command is often based on the libmodbus toolset, where debug levels typically work like this:

• -D 0: No debugging (default)
• -D 1: Basic debugging (shows Modbus messages sent/received)
• -D 2 and higher: More detailed debugging (e.g., internal library functions, timestamps, error details) -D 3 Hex description and more specific Error Codes.

[Matas]

Hello, the highest level it goes up to is 9.

Regards,
M.