The Industrial Raspberry Pi Forum

Posted: **04 Oct 2018, 08:22**

Hi,

I am using RevPi Connect to read RTU slave energy meter. I followed the tutorial as described on: https://revolution.kunbus.com/tutorials ... verwenden/
Additionally, I also followed the tutorial from Youtube. https://youtu.be/gaJ6-D4Vd6A
Unfortunately, I cannot initialize Modbus RTU Master.

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piTest -d

output given below:

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Found 1 devices:

Address: 0 module type: 105 (0x69) RevPi Connect V1.0
Module is present
     input offset: 0 length: 6
    output offset: 6 length: 5

I would really appreciate your help. Thank you.

Posted: **04 Oct 2018, 11:08**

Hi,
it looks like you didn't save the configuration in piCtory.
Have to save the configuration "Save as Start-Config." and "Reset Driver" and then please query the configuration again with "piTest -d".

Posted: **05 Oct 2018, 20:01**

Thanks for prompt reply. I managed to initiate Modbus Master. However, the output shows 0 only. I have attached the output as well as Extended Data settings.
For your information, I am using Socomec Diris A20 Energy Meter as slave. The meter has been tested from my laptop using Modbus Poll software. The connection and query was successful from Modbus Poll. Unfortunately, I am unable to query data using RevPi. Really appreciate your assistance.

Posted: **08 Oct 2018, 11:04**

Hi the device path of the RevPi Connects´ RS485 is

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/dev/ttyRS485

Please check the values of the Modbus_Action_Status_1 and the Modbus_Master_Status.
Please remind that you have to reset those values in order to receive new status by Master_Status_Reset = 1 and Action_Status_Reset_1 = 1.
Here in the tutorial Modbus RTU Master at the end you can see the error codes.

The Industrial Raspberry Pi Forum

Modbus RTU Master does not work

Modbus RTU Master does not work

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Re: Modbus RTU Master does not work

Re: Modbus RTU Master does not work