Using Arduino to read rs485 Modbus RTU holding registers 

Thank you very much. I have been working on controlling a VFD from a PLC and I can monitor my VFD values. Just a note, I had to swap the A and B 485 connections.

Thank you, I learned software serial configuration in your practice.

Very good, thanks so much ❤️

Hi Sir..! Hope you have a great day. Can you please help me I'm a student. I used same rs485 module and wants to communicate between master and slave system.....but both can transmit and receive data in two-way......! Problem is Master can transmit it's data towards slave but slave transmission towards master is in possible....! Please help....is it possible to transmit Data in both directions with this same ttl or I have to use another module..?

how can i made the same proyect but with a ESP32?

merci

Hi sir, instead of reading registers through modbus, can I use the Arduino to write registers on for example a PLC? Would you be able to provide me an example program?

Hi, what about the ground terminal which is near A and B pins of the converter? I think you should have common ground with the modbus device you are communicating with?

is this converter RS485 to RS232 ?

nice

Hi I need help M connecting it by my own controller but not connecting

Does the same ModbusMaster library allow the Max485 to send data? I am looking for a way to save previously received RS485 signals, and duplicate them in a new system. Basically tricking a controller into thinking it is connected to the original actuator

not working at all , reads constant value of 255 and not related to RS485 sensor

Sir how to write the register

Hello Sir, I am Anosh Milton I want your help How to get data From RS485 To Arduino Register Address is: 139 , Actually i hav6 temperature controller, and i want to get it reading on Arduino Serial, please help me..

Whats data[16] for?

Hello sir, can you answer my questions? A Modbus master sends a request to a slave to read several registers. The slave responds with the following Modbus message: "040302025874DE". 1. What is the Modbus function code used in the request from the master to read several registers of The slave? 2. What is the address of the first register to read in the master query? 3. How many registers to read in the master query? 4. Complete the following table to decode the Modbus message sent by the slave by answering the question What is the request sent by the Modbus master to read the slave registers from the address of departure 00 64

Hello I would like to create a project where I can read Rs485 (Holding Registers), (Float Registers) in arduino via wifi server. How much will a code like this cost me?

Hello sir, can you help by making a code to write data using MAX485 and i want to read the data in Modscan32 or 64

source code please

mình muốn đọc dữ liệu từ đồng hồ MFM384 selec được ko bạn ?

the link is broken sir, may you send me the code. thanks

i am getting error why

Hi

if uno, uno.