Modbus RTU Master does not work

rezaabdullah · Post by **rezaabdullah** » 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.

Post by **Eduard** » 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".

rezaabdullah · Post by **rezaabdullah** » 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.

Post by **dirk** » 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.