Modbus Block Reads

[@shashankkr1008]

Hello Emile, I just started my career as a Software engineer, and in one of my projects, I needed to control, get data from a cleaning robot on solar panels for which I am using Modbus, being from a computer science background, this is was bit confusing to understand, but then found you channel. Thank you so much for uploading these videos, the explanations are very clear, and animations are on point. Great work sir.

[@EmileAckbarali]

Hi Shashank, I am so very pleased to hear that you found value in the Modbus videos. Thanks so very much for letting me know. All the best with your project!

[@mother_hacker]

Your videos are just like a sip of water in center of desert! Thank you!

[@EmileAckbarali]

That's very kind of you to say. Pleased to hear that you have found benefit in them.

[@RushitShukla]

Thank You for uploading all these videos..I am an Instrumentation engineering student and I was very confused in all these protocols.. as at the first glance all seemed to work the same way..Now I am at least clear with Modbus and the fundamentals of RS485.

[@EmileAckbarali]

You are very welcome Rushit. Thanks for your kind message.

[@eng.aymanelsayed5159]

excellent demonstration . thanks alot

[@EmileAckbarali]

Thanks very much!

[@inamaman9891]

@@EmileAckbarali sir where I can get this course free I am a student and want to learn your teaching style is zabardast, please support

[@magudeseswaran9853]

Really interesting,great job.

[@EmileAckbarali]

Thanks very much Magudes.

[@augustmushi5743]

Thanks a looot ..........very informative.

[@EmileAckbarali]

Very welcome.

[@qzorn4440]

excellent... thank you..:)

[@EmileAckbarali]

Very welcome.

[@camilogalvispacheco4781]

Thanks for your videos, i'm a chemical engineer and these concepts haven't been clear for me until now! Can you please explain what is the nature of the communication signals?? i mean physically how is information transported??

[@EmileAckbarali]

Camilo, that depends on the physical medium being used. The Modbus protocol does not specify the media that is used. So there could be Modbus communication over RS232, RS422 or RS485 and others. Each media will represent logic 1's and 0's using different voltages. So the manner in which the information is transported will depend on the medium being used in the particular installation.

[@steve-o5859]

Question: if you indicate the start address memory block followed by “0” number of blocks, would it return only the data for the indicated address? I.e. Start address = 10050; Number of blocks = 0. Also, thank you for producing these lectures! They are quite helpful.

[@EmileAckbarali]

Hi Steve. Interesting question. In all of the equipment that I have programmed over the years, to read a single block, a "1" was always required for the "Number of blocks" parameter. The systems actually never allowed "0".