#Modbus

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Check out the Modbus Playlist :::: • MODBUS STM32
STM32 Playlist :::: • STM32 Tutorials
To download the code, goto controllerstech.com/stm32-rea...
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[@mohamadghobadi3015]

thank you very much ControllersTech

[@nachiketathakur697]

Hi, Amazing tutorial. I cannot thank enough. During coding this, I have found some key information regarding the hardware, which will be useful for everyone. 1. The USB to RS485 convertor used in the tutorial is NOT reliable. You can use it, but make sure that the GND and VCC of the TTL to RS485 convertor is connected with 5V and GND of STM32 development board. 2. On the USB to RS485, the A and B points may not be labelled properly. I have found that in my device, the A was actually B and B was actually A. 3. You may need to update the driver of CH430 chip (used by TTL to RS485 convertor). As while working with the Modbus Slave Device, I found that I could not select the port (the software showed "no" and port area was in red color).

[@jatinshakya6735]

Thanks for doing such a amazing work ....

[@Zurenio]

ControllersTech.... The best...!!

[@bogdan1543]

Similar but with an STM 32 as a slave would be great to see! Thanks!

[@Jason-ky8ho]

Thanks!

[@dillibabugopalakrishnan3720]

Awesome video....

[@asdasdasd93679]

Hi, great videos, as always. Only one question for you: why not use DMA (as per a previous video) for implementing Modbus?

[@kibet]

thanks

[@annakkiliarumugam7594]

I am facing the COM port issue in the Modbus master Master & Slave. I can see the port detail in Device Manager. But while I am trying to connect with the master/ slave using the same COM port I have seen in the device manager, it always shows in red [that means it is telling as an Invalid COM port but I had given the correct one]. And the same COM port is not used in some other applications. I have checked it. Why it is showing as an invalid COM port even though I had given the correct one?

[@angkhongminh911]

Can you make a example about modbus rtu with rtos. Thank you

[@huijaeyoon1185]

ControllersTech,... you're a light...!!! but i hope you post Wiring diagrams with these kind of videos for viewers

[@this_is_kd_singh]

Can you give links for only components used in this video

[@smecmanca]

Hi, wonderful video, can you make others for modbus TCP?

[@ShaikJaavid]

small request from me . please post videos on Quectel mc60 modules . because there are not much videos on them . if you have time please give a try.

[@muratpolat3956]

Waiting next video modbus rtu

[@StreuB1]

Best video on this topic I have ever seen!!! Could you also do a simple Master RTU with an ATTINY85 to simply query a Slave device for a single read register and then allow another device to call the ATTINY85 and have it host that memory location so that another device can pull it? So, the ATTINY85 acts as a MODBUS Master to the Slave device and host the pulled data to another device via something like SPI or I2C?

[@Itsme-le8hs]

I find it very easy to understand. Can you show what is inside the "modbus_crc.h" file?

[@ControllersTech]

You can see yourself. Its inside the inc folder.

[@bobshiskabob]

Hello, I have tried to implement this in a loop, as running it once is not very helpful. However, the interrupt is only triggering once for some reason. I placed a breakpoint in: void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size) However, I can only get it to trigger once, do you have any tips? Thanks.

[@ControllersTech]

You need to call the same function (receivetoidle_it) at the end of the callback function. Check my code I have called it.

[@bobshiskabob]

@@ControllersTech maybe its later on in the video series (EDIT: It is haha, I just saw it in a future video) . Right now your receivetoidle_it is only called once during initialization, and is not in the RxEventCallBack void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size) { Data[0] = RxData[3]

[@sopandhaye2327]

Crc lib link ?

[@user-nn6tq8vm2i]

hi,in your playlist as you were using modbus applications for testing the client and server. Can you provide me the information regarding the one to one controller testing i.e., one controller as modbus master and other as slave .Have you tested it or are there any sources to test this

[@ControllersTech]

it works the same way... You literally have the code for master and slave. just use them.

[@user-nn6tq8vm2i]

@@ControllersTech I got it, thank you for your playlist.

[@aliasgarshaikh7884]

unable to change data types other than Static in modbusSlave.h file what is wrong with it , actually i want to declare "Holding_Registers_Database[50]" array without static keyword.

[@ControllersTech]

Define it in the modbusslave.c file. Then define in the header file as an external variable

[@NguyenLam-cv5nt]

Hello channel owner, can you tell me whether that USB to RS485 to TTL converter is supported on win10, thanks

[@ControllersTech]

Yes it is

[@NguyenLam-cv5nt]

@@ControllersTech thanks

[@woldecosgrove]

Hello... i m just wondering y there's no #2 Modbus video?

[@ControllersTech]

Look in the modbus playlist.

[@Binhnx1hn]

Thank you very much, but I don't read continuously. Can you help me?

[@ControllersTech]

why what's the problem ?

[@KAMALZINZUVADIYA]

i run this code for stm32f407 discovery but i got corrupted data in modbus slave software

[@ControllersTech]

Check the baud rate

[@Vazzible_gaming]

Dammit I feel like I’m listening to an aperture science robot.

[@user-jo1oe8sb2r]

How can yo tell if "Simply Modbus" is safe to install?

[@ControllersTech]

I can't... Install whatever you want as long as it can be a modulus master and slave.

[@joserosario7208]

I'll try this but in PIC18F45K50

[@VipinKrishna-bs3dw]

Thankyou for the Work. but Can you explain how to create the modbus.h file

[@ControllersTech]

Under the project explorer, right click on the folder where you want to create the file. The click new -> header file. The give name modbus.h and click save.

[@user-vh4gb9rz9m]

How I can add Modbus_CRC.C and Modbus_CRC.C file? where is taken?

[@ControllersTech]

Download the project from the link in the description. They are inside src and inc folders.

[@user-vh4gb9rz9m]

could you please share link with me?

[@ControllersTech]

Read the description of the video

[@ShaikJaavid]

Quectel mc60 module with amazon aws via mqtt is exactly what i need . i am always getting error near subscribing a topic and publishing a topic. there is no much help from Quectel guys

[@cutecuts2995]

Hi sir kindly explain the library file or else share the file..

[@ControllersTech]

Read description

[@ShaikJaavid]

why are you doing left shift. i dont understand why ? you just write data[0] = rxdata[4]; data[1] = rxdata[6]; data[2] = rxdata[8]; and so on

[@ControllersTech]

Registers are 16 bit wide. The data for each Register is transferred in 2 bytes. That's why..