How to get values through Modbus communication

[jiji.thankappan]

Hi all,
am trying to connect my winccoa demo project with an RTU through Modbus driver, its showing some values (not exactly the values stored in RTU) , here am attaching 3 screenshots, pls give me solution for this https://www.winccoa.com/fileadmin/image ... hot_10.png

[Gertjan van Schijndel]

It looks like you want to read 32bit values from a TBox RTU, which uses big endian. So setting the following config entry should resolve your issue:
[mod]
littleEndianRegister = 0

But to make use of the buffering functionality of the device you could better use the IEC 60870-5-104 or DNP3 protocol.

[jiji.thankappan]

Thank you.....

[jiji.thankappan]

Hi Gertjan van Schijndel ,
Thanks for your support.....now i am getting the exact values.... :woohoo:

[jiji.thankappan]

Hi,
Also in DNP3 I can read and write the analog signal, in the case of digital signal i can read the values from RTU but i can't write ,so can you please give me a solution for how could I write digital output values?

[Gertjan van Schijndel]

Jiji T S wrote:

Also in DNP3 I can read and write the analog signal, in the case of digital signal i can read the values from RTU but i can't write ,so can you please give me a solution for how could I write digital output values?

You could better open a new topic for this question, since it has nothing to do with Modbus communication. After first looking into the other DNP3 topics.