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Questions tagged [modbus-tcp]

A messaging structure developed by Modicon. It is used to establish master-slave/client-server communication between intelligent devices.

A messaging structure developed by Modicon in 1979. It is used to establish master-slave/client-server communication between intelligent devices. (from http://www.modbus.org/faq.php)

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Simulating a modbus slave using node red

I'm trying to use node-red to connect to a master using Modbus and simulate slave devices, sending data to the master when it asks. I have tried looking everywhere for hints on how to get started and the only examples using the…
MattieG4
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Calling multiple registers simultaneously in a ModbusRTU using python?

I have a Modbus-RTU thats connected to a Modbus-RTU/TCP-Gateway, which i'm trying to call. Works fine, but I have to read multiple values each reading cycle. I'm using the pymodbus library. Say I have 3 Registers to read: Address, WordLength 1:…
JCB
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mgsmodbus of myarduinoprojects.com how to use it

I'm trying to implement a modbus tcp comunication between two arduino. Following the two examples on myarduinoprojects.com, when I connect two controllino and load the program to the slave and master, it prints on the serial this serial output, and…
nicola marconi
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How to integrate tcp-modbus with diffie hellman?

I have a simple modbus client-server code and also have a diffie-hellman client-server key exchange. My aim is to integrate the two so that when modbus client initiates request to modbus server, first step is do a key exchange and then encrypt the…
InfiniteMonkey13
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ModBus on TCP with Java

I have a HLK-DIO16 device supporting modbus over tcp. In the user manual I see an example to read Simultaneously 16 digital input the string is: 0x01030026000165c1 01 device address 03 function code 0026 register initial address 0001 register…
Giuseppe
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How do I send signal to modbus over TCP/IP in java?

I am working on a client application that is supposed to send a signal to modbus that opens and close a gate with ip address and non-changeable port number 502. The instruction say to create a win-socket client application and send command buffer. I…
sanki
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How to read from modbus/tcp using libmodbus

I have a moxa ioLogik E1214 and I want to communicate with it using modbus/tcp. I found a library that should do that - libmodbus. Firstly i copied the code sample from their website and changed it a litte so it looks like this: #include…
P.B.
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How corrupt checksum over TCP/IP

I am connecting my slave via TCP/IP, everything looks fine by using the Wireshark software I can validate that the CRC checksum always valid “good”, but I am wondering how I can corrupt the CRC checksum so I can see like checksum “Invalid”. Any…
Tariq Bellachhab
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Reading 32 bit Float from modbus TCP using node red

how to read modbus TCP holding values (03) - 32bit float word swap (CD AB) with node red function block ? I have problem with modbus... Reading from modbus TCP ( FC3 , data size 32 bit Float, address 272 decimal)... When Node RED read values ( FC 3,…
Damir Švegović
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Using EasyModbusTCP Java, how do I read my registers as unsigned values?

I am trying out easyModbus TCP, to read in holding registers of a ADAM 6017 analog unit. I am using the example client code to get familiar with this library. The problem I seem to be having is I need the values of the registers to be read as…
Michael H.
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convert Modbus TCP data in readable format

I am trying to read Modbus TCP data over my AWS cloud EC2 instance. As I have one machine which is generating MODBUS TCP(Slave) data and sending it to Cloud. And at cloud I'm receiving data using TCP server program written in python using socket.…
Shriniwas
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is Tcp-Modbus basically a Cleint-Server socket communication?

I'm building a TCP-Modbus application on PIC32MZ starter kit and My kit should act as Modbus-Slave device (read some data available on the ADC channels and send it to Modbus Master on every poll it will make), but I'm not sure, whether my device…
Aatif Shaikh
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pymodbus: Issue reading String & multiple type of data from Modbus device

I am trying to read String (Usecase-1) & multiple type of data in one request (Usecase-2) data from Modbus TCP device but, it failed to decode it correctly. System Configuration: Python 3.6.5 Pymodbus: 2.1.0 Platform: Windows 10…
OO7
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Setting up Modbus network using pymodbus

I'm setting up a Modbus network. I have a Raspberry Pi, the Pi should be functioning as a server (collecting the data). And the data will come of multiple Arduino running as a client. I hope I say that correct. See the photo for a layout…
Stefan de Kraker
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pymodbus read meter registers

I'm new to modbus but I have a small project to work on. I need to read some values from an energy meter. I wrote this from some examples found in the internet: import logging from pymodbus.client.sync import ModbusTcpClient as…
Luis Javier Alvarez Rodriguez
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