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Questions tagged [modbus]

Modbus is a simple protocol for serial communication between electronic devices.

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43 views

Problem with modbus communication between two arduinos when writing more than 27 registers

I have the following problem: I want send 200 registers from a modbus master to a slave. Both are arduinos. I can't send more than 27 registers. When I send more i get the Errorcode 255 which means ...
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2answers
208 views

Modbus IP with Simply Modbus TCP

include SPI.h include Ethernet.h include Modbus.h include ModbusIP.h //Modbus Registers Offsets (0-9999) const int SENSOR_IREG = 100; //Used Pins const int sensorPin = A0; //ModbusIP object ModbusIP ...
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1answer
160 views

Using Modbus-RTU with Arduino and temperature controller

I'm trying to connect with a 4 channel temperature controller using Arduino Modbus Library. This is a part of my temperature controller datasheet. It has register for read PV of each channel. I have ...
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1answer
276 views

Using Modbus TCP server on Arduino

I have a scd30 sensor wired to an Arduino Uno. The scd30 works on the I2C protocol. I am able to read data live on the serial monitor on the Arduino IDE. I have an ethernet shield on my Arduino. I ...
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0answers
125 views

Arduino and RS485 comminucation

I want my arduino to communicate with a rishabh delta energy meter - http://rishabh.co.in/uploads/product/Delta_Energy_Manual.pdf I used the Max485 module for arduino and connected it as follows: A(...
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2answers
66 views

How to control two devices with Arduino? [closed]

I want to control two devices: AC Humidifier I have a DHT11 sensor for temperature and humidity. I want the AC to turn on when the temperature is greater than 30°C, and off when it's less than 20°C....
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0answers
372 views

ENC28J60 + Modbus master - proven library needed

I'm trying to connect my Arduino Uno to the PLC (Fatek) through an ENC28J60 module. Arduino must be a Master (Client). PLC is the Server (Slave). ENC module is connected to the ICSP port and the CS is ...
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1answer
125 views

Multiple #ifndef vs. single one #endif

My question is connected with the issue as linked: Is there any good working MODBUS TCP master library available for Arduino? An example of Modbus TCP master library as suggested in the post above. A ...
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1answer
335 views

Arduino Modbus RTU VFD control

I need help with this code: /** * Modbus master example 1: * The purpose of this example is to query an array of data * from an external Modbus slave device. * The link media can be USB or RS232....
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1answer
641 views

How to make I2C work on RS485?

I'm trying to optimize the communication (minimize wires) on a project where I can control a motor and toggle some 230V devices by using RS485 and I2C. On this project, I'm using an Arduino (Mega) ...
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1answer
551 views

Arduino Modbus Master code to read data using arduino uno from EB meter

I am using DC energy meter as slave.When I am testing DC energy meter using Modbus tester tool,its showing value from 1 to 24 register.I am using my own atmega328P with on board RS485 as a master ...
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129 views

Problem when read data from Schneider PM1200 by Arduino MEGA 2560 [duplicate]

Mission Read data from registers of Schneider PM1200 by Arduino ( Modbus Master) Link : http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/212000/FA212509/en_US/...
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224 views

Problem when read data from Schneider PM1200 with Arduino Mega 2560

Mission Read data from registers of Schneider PM1200 by Arduino (Modbus Master) Link : http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/212000/FA212509/en_US/...
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1answer
5k views

Modbus RTU controller monitoring with arduino and RS485 module

I'm a medium user in Arduino. I baught a pHmeter controller with RS485 output (MODBUS RTU protocol). I want to get pH value read by the controller over RS485 module and Arduino. According the ...
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2answers
5k views

Arduino ModBus RTU master communication with Power Meter problem

i have an arduino UNO with RS485 module. I have made this connection: And i have an problem with communication of this module with power meter "InePro PRO-1Mod" (datasheet) over ModBus protocol. I ...
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1answer
138 views

Cannot obtain reading from meter (Modbus)

I have a system in which I am taking readings from a meter and processing it through an Arduino Nano. My code looks as follows: #include <SoftwareSerial.h> #define SerialControl 7 #define ...
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2answers
439 views

float not a float

I am trying to read a SDM220 meter on my solar setup. I've been reading it using Modbus SCADA, so know it all works ok. But I want to read it with my Arduino Mega 256. My problem is that when I run ...
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0answers
168 views

Behaviour of Serial.available() and Serial.Read() in Genuino Zero

Here is my code. I have implemented a modbus slave in Arduino Genuino Zero. For the master I am using modbus poll. In this code, I am saving the data received from modbus poll's in frames. Using this ...
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0answers
1k views

Problem in MODBUS RTU communication between two arduino's

I am doing a project to communicate between two Arduino's using MODBUS RTU protocol. I have set one Arduino as the master and the other as the slave. The slave Arduino reads the analog value from a ...
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2answers
5k views

Modbus RTU slave library

I want to use an Arduino Genuino Zero as a Modbus slave. I tried to search on google, and found a library. When I try using the library, I get a timeout error. Can anyone tell me how to solve that ...
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1answer
394 views

Need Help to implement MODBUS TCP Master over Atmega32 MCU

I am doing a project where I have to interface with Fronius Solar Inverter with Atmega32 MCU over MODBUS TCP. I want to set the MCU as client and The inverter as Server and I have to implement two ...
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1answer
6k views

Is there any good working MODBUS TCP master library available for Arduino?

I would like to connect with Fronius solar inverter through MODBUS TCP with Arduino to READ and WRITE register values only. I want to set the Arduino as master and the Inverter as slave. I want to use ...
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1answer
412 views

Connect Arduino to PLC (Data Exchange)

The Arduino should read data from a PLC. Has anyone experience with this? What would be possible interfaces? I would prefer OPC-UA, but all the research I did, only OPC-DA was mentioned. Thanks in ...
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1answer
1k views

Can I connect to a DALI network as a master node using an Arduino?

I have googled a lot, and mostly every website you can link me I have already explored, some are outdated and don't work, others aren't clear in their documentation, and use equipment too expensive to ...
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1answer
466 views

Talking to Eurotherm 2416 temperature controller over modbus rs232

I am trying to implement the modbus library written by smarmengol to read process values and to set new setpoints (e.g. temperature) on a Eurotherm controller. The Arduino sketch looks like this: /** ...
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1answer
3k views

Modbus RTU over TCPip

I have developed my arduino code using below library. I tested code working fine over modbus RTU slave. Now i am planning to use RS485 to wifi instead of wire connection. In order to get data over web ...
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0answers
574 views

Modbus Protocol RTU

I have simple code working on Serial Communication asn below. With Same data i would impliment Modbus protocol> I have Used Modbus library for arduino earlier which works fine with 9600 baudrate and ...
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1answer
1k views

Why ModBus RTU Master-Slave Dont Work

I have two mega arduino and want to them communicate with modbus rtu together, i use below link circuit for this : http://www.microcontroller-project.com/rs485-communication-between-arduino-mega-and-...
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1answer
777 views

Arduino throwing error while using modbus RS485 code

I have been trying to make a communication with my industrial drive. All I want to do is read a few values of drive, like current, voltage etc. For that I am using a library: I don't understand why ...
1
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1answer
327 views

Modbus master arduino code is throwing weird errors on upload

I am using the following https://code.google.com/p/simple-modbus/ arduino master library code. In order to communicate with my industrial drive. All seems right but I am getting some weird errors. I ...
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1answer
1k views

Modbus Communication protocol for Arduino as Slave

I have an Arduino Uno board, with these components: rs-485 Modbus module shield Multiprotocol radio shield board for Arduino In addition I have a level sensor which reads either 1 when it is above ...
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4answers
5k views

How to interconnect multiple Arduinos with a Rpi to control home-lights/switches

While planning the lightning infrastructure (wall-switches and lights) of my new home (it's still under-construction) I choosed to go through the "automated route" way and due to my background (I'm an ...
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0answers
192 views

Anyone using ModBus RTU on Galileo gen 2?

I'm trying to communicate with some industrial hardware, on ModBusRTU, from my Intel Galileo Gen2 board. I use this board to convert UART to RS485 http://linksprite.com/wiki/index.php5?title=...
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2answers
329 views

Communication arduino MODBUS fails on high number of registers

When I try to run the following program it runs ok: #include <modbus.h> #include <modbusDevice.h> #include <modbusRegBank.h> #include <modbusSlave.h> #include <...
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1answer
354 views

ModbusMaster.h - changing node

I'm using the ModbusMaster.h library on a project, with arduino-uno and a TTL/RS-485 converter, and the function has to identify the slave that it is communicating. The slaves goes from 1 to 16. After ...
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1answer
846 views

modbus slave ID setting

I have small problem in setting device ID for Mosbus slave arduino. Here is simple example In Modus library; device ID being configure hardcode while program. This code works for Me. Modbus slave(1,...
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1answer
2k views

Modbus slave data into word

I have simple code. The library downloaded from github:smarmengol/Modbus-Master-Slave-for-Arduino. I wanted to store floating point. In the code blow, I type casted to integer value. As I know ...
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1answer
3k views

Modbus master slave

I need Help in two thing Here. 1)My main project is i have 23 hallsensors with analog output. There are connected to arduino UNO analog pins using 16:1 Mux or 8:1 mux circuit. The currently i can ...
2
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0answers
527 views

Negative value conversion for modbus slave

I have an analog sensor which reads values 0-5v, -75 degrees to 75 degrees. Now I have converted to +75 degrees and -75 degrees format depend on the voltage. From 2.5v to 5v data is read properly (i....
3
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1answer
2k views

Response of Modbus Protocol

I have the below code. This code is successfully compiling and uploading, but I am not getting any response from Slave. What do I need to do? Some time data being received from Slave (I get this ...
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0answers
857 views

MODbus response for configure data

I am not able to receive data. I am able to send data from master but am not getting any response. This program uploaded successfully. I have below setup to monitor data from Modbus. I have included ...