01- What is Modbus ? And detail of Modbus RS485 RTU Communication?

Excellent video and exactly what I needed for my research. Thank you!

It is a very good presentation, keep up the good work.

Modbus RTU u can able to connect max 32 devices without repeater and with repeater you can go up to 247 devices max length 1200 feet

Good presentation could follow up with actual sample

Practical example for energy anaylzer

Super video for iiot engineering thank you sir

Thank you very much for your detailed explanation.

I have a doubt in my loop 12 flow meters connected.some rime some meter is problem or went off.the total loop went offline please help me on this.

Great

Something I was looking for on the subject. Very nicely explained

Thankyou

Nice information ❤

Thank you for your video. It explained very well what I need it to understand.

Thank you for sharing your expertise❤

very nice Waqas sb, you are doing such a great job

Great video .... Superb thanks a lot. Very helpful

Why you stopped uploading new videos

Thank you

Mashallah ,, That was best video I have ever watched about the ModeBus. Thanks very much. AjarakAllah. If u could, please give some example how to send these data by PLC to the slaves.

Very nice video. It is a great one for the beginner's

Good explanation, thanks

I am experiencing some issues with the 4 to 20 mA output from my Rheotherm flow meter. When I power the transmitter, it shows up on the screen, I check the power is 24Vdc and when I check the output from the transmitter to the Analog input card, I'm not getting a known 4 to 20 mA signal.
To clarify, the power cable is connected to the power terminal of the transmitter, and the signal cable is connected to the output of the transmitter and channel 10 of the Analog input card.
Could you please assist me with this? Here are some details that might help:
SERIAL NO: 17014-01
RANGE: 0.0273-27.3 MMSCFD

Thank you sir

Nice video dear

Nice information.Thank you sir 🙏

I have delta dop-B05S100 HMI and autonics THD series humidity sensor. I am facing the problem in communication between HMi and sensor.

Informative Video Sir Keep it Up🙏🙏

Great explaination man thank you so much

perfect

Hello! I send a data packet "slave func data srs16", but the result is this signal "00 slave func data srs16". Why do two zeros appear? ModbusRTU

Excellent

Sure, here are the answers to your questions:

1. The Modbus function code used in the request from the master to read several registers of the slave is 0x03, which is the Read Holding Registers function code.

2. The address of the first register to read in the master query is 0x0202.

3. The number of registers to read in the master query is 0x0258, which is 600 in decimal.

4. To decode the Modbus message sent by the slave, we can break down the message into its different parts:

Slave Address: 0x04 - This indicates that the message is intended for slave device with address 0x04.
Function Code: 0x03 - This indicates the function code used in the request, which is 0x03 for Read Holding Registers.
Starting Address: 0x0202 - This is the address of the first register to be read by the master.
Number of Registers: 0x0258 - This is the number of registers to be read by the master.
CRC: 0xDE74 - This is the Modbus CRC value for error checking.

To answer the question "What is the request sent by the Modbus master to read the slave registers from the address of departure 00 64?", we can convert the decimal value 100 (which is 0x64 in hexadecimal) to a Modbus address, which would be 0x0064. Thus, the request sent by the Modbus master would be:

Slave Address: 0x04
Function Code: 0x03
Starting Address: 0x0064
Number of Registers: 0x0258 (600 in decimal)
CRC: Calculated by the master based on the request message.
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Very nice explanation that is so much helpful. Please improve your audio quality.

Hi I'm Sam from Nairobi, you are doing a good job now I have understood Modbus communication protocol well.

Sir modbus se RTU me communication karne ke liye kaun sa divice use hona hai

sir good morning,we are using modbus RS 485,how we can read signal in IEC 104,Party using SM 2556 system,any divice we used kindly suggest

Comprehensive tutorial. Great job!

Thank you sir. Its very useful.

Very very rare video with such clarity on modbus. I am not communication or instrumentation Engineer even then I liked and learnt a lot

Great explanation, easy to understand.
Thank you for your knowledge Sir

Explain about CRC data

It is great lecture to understand modbus, Thank You very much. Please continue or make a book for this. Prof Luhar

Superb ❤️

I want help in modbus communication

Hi sir

Thanku sir

Just what I wanted to understand modbus.

Good explaination sir

Great. Could you describe the term DTE, DCE, CRC in Modbus please?