Modbus Checklist
The terminology changed according to modbus.org. Unfortunately, this conversion has not yet been completed here.
Update to the newest stable Revolution Pi Image
Update PiCtory to the newest version.
Modbus RTU
Set the timing of the action interval to 1000ms. This is the default value.
Check if the Extended Data in the Modbus RTU Master is set correctly.
Do the addresses and the access function fit to the slave?
Are there any empty data?
Modbus TCP
So far, there is no need for action here.
Client application
Check the status of the background daemons
sudo service pimodbus-master.serviceOutput | Fix |
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Unit pimodbus-master.service.service could not be found. | sudo revpi-config enable pimodbus-master
Created symlink /etc/systemd/system/multi-user.target.wants/pimodbus-master.service → /lib/systemd/system/pimodbus-master.service.
0 |
Server application
Check the status of the background daemons
Output | Fix |
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Troubleshooting
Check if the Modbus Service is Running correctly by inspecting the log to see if the Modbus demon outputs errors
Output | Fix |
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Check the PiCtory configuration
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Check the “Extended Data” configuration
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