piTest does not show modbus value

[Peter_Platzer]

Hi,

I configured a small modbus test reading a holding register called Geraeteklasse with a modbus master.
It looks like the read is done correctly on modbus level but piTest shows the wrong value.
Setup:

Extended Config looks like:

Modbus log on the slave side:

Code: Select all

>12:23:29: RX: 0a 06 00 00 00 06 03 03 75 62 00 02 
>12:23:29: Sent data: Function code:3.
>12:23:29: TX: 0a 06 00 00 00 07 03 03 04 00 00 ff ff 

Register value is FFFF.
But piTest shows 0.

Code: Select all

pi@RevPi106990:/var/log $ piTest -r Geraeteklasse
2 Byte-Value of Geraeteklasse: 0 dez (=0000 hex)
2 Byte-Value of Geraeteklasse: 0 dez (=0000 hex)
2 Byte-Value of Geraeteklasse: 0 dez (=0000 hex)
2 Byte-Value of Geraeteklasse: 0 dez (=0000 hex)
2 Byte-Value of Geraeteklasse: 0 dez (=0000 hex)

BR
Peter

[dirk]

Hi Peter, take a look at the following registers, they may contain error codes:
Modbus_Action_Status_[1... 32]
Modbus_Master_Status
You can then reset these errors by writing a 1 to the corresponding registers:
Action_Status_Reset_[1... 32]
Master_Status_Reset
Here is the documentation
https://revolutionpi.com/en/tutorials/m ... -verwenden
Please carry out the steps on the checklist
Modbus Checklist
Here are the FAQs on Modbus from our knowledge database:
https://kunbus-gmbh.atlassian.net/servi ... 2629664769