RS-485 MODBUS Serial Communication with Arduino as Master

Check out the detailed tutorial on RS-485 MODBUS Serial Communication with Arduino as Master: circuitdigest.com/microcontro...
For Arduino as Slave tutorial, visit this link: circuitdigest.com/microcontro...
A Brief About RS-485 Serial Communication:
RS-485 is an asynchronous serial communication protocol which doesn’t not require clock. It uses a technique called differential signal to transfer binary data from one device to another. It provides a Half-Duplex communication when using two wires and Full-Duplex requires 4 fours wires.
Connecting RS-485 with Arduino:
RS-485 Module can be connected to any microcontroller having serial port. For using RS-485 module with microcontrollers, a module called 5V MAX485 TTL to RS485 which is based on Maxim MAX485 IC is needed as it allows serial communication over long distance of 1200 meters. It is bidirectional and half duplex and has data transfer rate of 2.5 Mbps. This module requires a voltage of 5V.
Visit circuitdigest.com/arduino-pro... to access 200+ useful arduino projects and tutorials.

[@qzorn4440]

this is a wonderful rs-485 modbus arduino explanation... thanks so much sir...:)

[@viviresbrillar]

Thank you for this excellent example and explanation, sir.

[@yugendravenkatadurgamruthk7797]

Awesome Simple and decent Video. Congratulations for such wonderful video.

[@OliverBasoa]

Thank you very much for this video. It has been very helpful

[@guyvanleuven5814]

This really helped me getting started with this ... well done 👌

[@davidshalem1688]

great video! do you have a video that shows how to read from the slave and not just writing to him? thx

[@electronic7979]

Helpful video. Very good

[@shridharkatwe2549]

Thanks a lot for this helpful content.

[@derrickpresley8708]

Hi, I need to know how I can put the same implementation to a pressure sensor

[@mohdzubair80]

Good work...very helpful to me....Tha nk you

[@bhaipagent]

one of the best videos and only ways that worked for me thank you very much.

[@peachville4383]

A 3 second delay between button press/release and Modbus software display??? I use VB6 to interface PC and Arduino directly using USB (RS232), which also powers the Arduino.

[@surajchauhan-ug4fl]

Can you tell me how to control vfd using Arduino or with 8051 microcontroller??

[@txonso1194]

Hello, with this library you can control several slaves, would I need a closing resistor? Thank for your time

[@ilokanoak03]

can you interface Arduino uno to max485 ttl rs485 to usb to rs485 to a sensor specifically to 485 soil npk sensor.?

[@joneschotten8056]

It works fine when connected via USB with slave simulator, however when connecting MAX485 to a modbus meter it does not work. Have you ever had this problem?

[@thinktubers]

Everything okay but it shows insufficient bytes received could you please guide me on how to solve this issue?

[@egrabhishek]

Helpful. Thank You.

[@electronicprojectspune3523]

i have a temperature controller with RS 485 out put , i want to send the signal over to wifi

[@RahulKumar-od9ns]

thank you for a good example, but can we do it vise-versa, I want Modbus signal as an input to Arduino & same is transmitted to the cloud through wifi. is there any tutorial on it, plz share, thanks

[@lekimcong1549]

I followed the instructions, using the modbus slave software, I received the transmission data, but using the modbus poll software, I got a CRC check error. Can you guide me how to fix it.

[@wilmaridmawan6255]

Your video is verry usefull, thank you for your videos's sharing....

[@rickelmedias]

Do u have reading values with arduino as master and slave simulation?

[@nguyennhatquang4894]

hello i have downloaded your library and used your code but i keep getting the error that no matching fucntion for call to "ModbusMaster::begin(int, HardwareSerial&)"

[@dibyakantajana7358]

Can I use two way communication with master and slave using rs485 ?

[@user-yz9hi6by2u]

ขอบคุณมากเลยครับ

[@wuttichaiwetsanon1107]

ข้อติอต่อหน่อยครับ

[@domoledlight]

very good video how to read float value 2.5 from pc slave from arduino master

[@ilkeraykut7064]

I am trying to do this with esp32 but nothing appears.Please help.

[@FabricioDanielWellig]

With this sketch it is also possible to read slave registers?

[@mrashad219]

If this is hooked up to a PLC to recive counter or timer values, does it become a master or slave.

[@ankithaarun3507]

Node.begin in the program is giving some error please help me in this..

[@PredragMrvic]

Why is display so slow when pressing S1 and S2 buttons? Is it the delay loop in arduino program?

[@elnicus]

change it to delay(10);

[@chithanhbui8472]

i can't upload this code to arduino uno R3. Pls help me

[@sajitsingh3965]

It's not working for me..Any suggestions?

[@soundarrajan153]

Can you please share about modbus to bacnet communication

[@pratikshafunde3457]

plz make vdo of how to read temperature sensor with ptc1202A with rs485 ,aurdino.

[@seimela]

Can i control a servo motor?

[@maciejpawlinski9009]

I try to upload the code to arduino, but some functions are not defined (for example begin, pretransmision and posttransmission). Does anyone have a solution to this?

[@jianweiliu1500]

I also get into this trouble, did you figure it out? If so, could you give me some suggestion?

[@JoeEvansSound]

@@jianweiliu1500 put this at the top after the defines... void preTransmission() { digitalWrite(MAX485_RE_NEG, 1); digitalWrite(MAX485_DE, 1); } void postTransmission() { digitalWrite(MAX485_RE_NEG, 0); digitalWrite(MAX485_DE, 0); }

[@gadisykes4499]

@@JoeEvansSound Thats already in the code, after this: LiquidCrystal lcd(8,9,10,11,12,13); //Object lcd for class Liquidcrystal with LCD pins (RS, E, D4, D5, D6, D7) that are connected with Arduino UNO. I´m having problems too, I can´t even compile the sketch, but it highlight the ID line on the code, on void setup

[@kirannb5354]

Nice demonstrate sir.. I have a doubt, how to communicate two HMIs with two ardiuno board, with HC-12 Wi-Fi module at both TX and RX side. And one more thing is I did all the connection and everything, I failed to write ardiuno code for this task...

[@kirannb5354]

Please help me to write code, 8431063162 Is my Whtsapp number. Please feel free to reply...

[@receptolgamutlu8263]

thanks for the video and info,ı wanna take data from three phases multimeter how can ı fix this or code could you help me, please

[@chethanvdevadiga2600]

I am not getting the data in Modscan

[@NoName-ut9wd]

Sir can you give me this arduino code ?

[@mohdzubair80]

It's only transmit integer part of the value....so how I can transmit a float value...let me know plzzzz

[@elnicus]

analogRead(), return an integer value, you must apply maths to convert this number in voltage for example.

[@neethurs6278]

Can you please tell about where the Arduino 's USB port is connected with?

[@ozcanaltinbas3101]

As far as I know, Arduino's USB port is connected for power requirement only.

[@grantcollie7346]

Is there any way I can convert this to be used with an RJ45 port?

[@Circuitdigest]

RS-485 is a bit different from RJ45. Please post your questions in detail on our forum circuitdigest.com/forums. Someone there will be able to help

[@charanpreetsingh8866]

yes, use W5100 and ModbusTCPServer, you will get same functioning over LAN port (ModbusTCP/IP protocol)

[@chiragpatel4335]

TCP IP communication???

[@med6402]

can you send data from slave to master??

[@elnicus]

You must to use read function (coils, holding registers, etc)

[@kumaranms3572]

What are the applications of this project Sir ?

[@AndreasDelleske]

Kumaran M S Reading all kinds of electronic Meters, Solar converters etc.

[@vishalmhatre1731]

Hello i am trying to connect rs485 enabled temperature sensor with arduino can you help me

[@Circuitdigest]

Hi, you can use the above video as a reference. You mostly will only have to change the register address according to your sensor.

[@vishalmhatre1731]

@@Circuitdigest is it possible i can get connected with you

[@gadisykes4499]

I couldn´t even compile the sketch, it shows an error on the ID device line, but I'm using the exact same code

[@jilsonjose3408]

i am facing same issue

[@gadisykes4499]

@@jilsonjose3408 spanish? I solved the problem by installing a modbusmaster library directly from the IDE

[@jilsonjose3408]

@@gadisykes4499 but now I have weird behavior on modbus poll "insufficient bytes received"

[@gadisykes4499]

@@jilsonjose3408 what is the slave you are trying to comunicate with?

[@thinktubers]

@@jilsonjose3408 Did you solved it? am getting the same error

[@tanmeowsoon5252]

Hi Sir Good day can guide about how this Modbus work can i learn from you , hope you can reply me Thanks you ,

[@Circuitdigest]

Hey please check the link in the description for the step by step guide

[@tanmeowsoon5252]

@@Circuitdigest Hi sir good day ok i will try it later see how it go Thanks you ,

[@pruthuvinavod7035]

How to change the parity bit via Arduino???

[@Circuitdigest]

If you mean how to change parity bit in Arduino code you can use the Serial.begin(speed, config) function. replace speed with our baudrate(eg 9600, 115200 etc) and the config with appropriate config parameter( for eg the default will be SERIAL_8N1, 8 bit data , no parity and 1 end stop. If you need more help please start a new discussion in our forum. circuitdigest.com/forums

[@pruthuvinavod7035]

@@Circuitdigest thank you for the advice 🤍

[@BKK-Japan1]

There some lot of delay.

[@2012javad]

whats with the fast talk if you got such heavy accent? No hate tho

[@kremicfein]

that's compression - more information per brain cycle