How does Modbus Communication Protocol Work?

▶ Check out the full blog post over at

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In the previous video, you learned about what Modbus communication protocol is and the types of Modbus communication used in the industry.

Now, as promised, in this video you are going to learn about How Modbus communication protocol works between devices.

Each Modbus message has the same structure. Four basic elements are present in each message. The sequence and order of these elements are the same for all messages. This allows for easy parsing of the content of the Modbus message.

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And for more information about different protocols used with automation, refer to the following website;

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#RealPars

[مجتبىالشمس-رل]

I am a fresh graduate electrical engineer whose experience in automation is less than a year. "RealPars" is my #1 source to understand the basics and smooth my learning curve.
Thank very much for the effort and time you put into these educational video.

[farhad]

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[rhoonah]

I used to work for a process control company called Intellution and I wrote their Modbus driver :)

[kubapacura]

Thank you a lot guys for these videos. I'm writing my thesis about Modbus protocol and your videos are helping me so much to deal with this problem. Many thanks again! ;)

[nasirmustafa]

Real Pars,
We do really appreciate your efforts and time to provide these learning videos, simple, informative in a very short of time
Well done
Hamza

[pseudolimao]

these videos are great, wish there was a playlist on your channel for them

[williambravin]

Thank you for this teaching clear and pragmatic. As i see this is a old video may i suggest that these videos are updated to include integrations with Home automation solutions such as home assistant.
Once again thank you

[kiranrathod]

More knowledgeable and Hopefully video for All kind of Larners, Thank you sir

[picable]

Hello RealPars..!
All your videos are extremely useful and content full. Sir Pls make some videos on OPC Server or OPC/DA Server and why and where it is used.??? How to configure it.

[pcrb]

Hi, really appreciate for your time, knowledge and effort in the process of educating us by providing simply superb demonstrations. Thank you so much .
at 9min 18 sec video, for "most common function code" for 02 instead of read inputs captured as read outputs, kindly correct me if im wrong

[alitaherkhani]

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[EdwardtbA]

Good video!!!
This video contains protocol format and communication example. Explains each communication step with clear animation. That is very useful for beginner like me.

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[syedjawadable]

Sir your team is really doing a wonderful job... The video is so informative..
Sir request you to please explain us how to evaluate P, I and D values in stand alone pid controller.

[vinceroos]

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Clean. Neat. Professional. To the point and understandable.

[natriumguy]

Very informative and easily understandable video.

[islammuhammed]

Great job n informative as always Real Pars!
Hope you continue videos series like this for all Industrial comm. protocols like ASI protocol, ProfiNet, Profibus ....etc

[AungWinHtutGH]

Dear Sir, Thank you so much for the crystal clear tutorial. We all love to learn from your videos. I have one question, Sir. How can I get a copy of the simulation software for the slave devices? Would you mind kindly reply me the link if you have free time, Sir.