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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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Creating a Customized MODBUS Program for a Remote Terminal Unit

I have here a unit of King Pigeon S275 Remote Terminal Unit.. this RTU has communication modules for GSM, GPRS and TCP/IP (via RJ45 connection) I can also communicate with this RTU by connecting it to my computer via USB . The Manual I uploaded in…
user5150379
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What's the best way of writing the float value to ModbusServerContext

I'm using the pymodbus library for creating the Modbus server. I've discovered all examples which you can find here. I faced with problem related to writing float value on the server (slave) side. There is an updating_writer function in which I want…
Mind Mixer
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Pymodbus: read operation on invalid unit id renders all future transaction with valid unit id's failing

I have a modbus simulator with 4 slaves [1,2,3,4] defined in it [using modbus_tk] , I also have a pymodbus client to talk to this modbus slaves over TCP . Everything is working fine as long as we are using the correct slave device id's (unit id) but…
Sanju
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Modbus RTU Implementation in embedded C

My question would be weird so I do apologize for that. I am going to implement Modbus RTU Master in an electronic device Called "DiGi Module Connect Me 9210". From this device I will request some data from PIC, data like Nodes and Temperatures and…
Master Blaster
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How to get the ip address through modbus communication?

I am making an iOS application in which it will access IP addresses through Modbus communication device by UDP socket program not all the IP addresses which is present in wifi as the project is already present in github. I have android code which is…
Satyajit Patnaik
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php rtu modbus connection write to coil and read holding registers

First of all this is my first attempt for PHP - Modbus. I am trying to read registers from a modbus register using phpmodbus from http://code.google.com/p/phpmodbus/ My micro-controller is connected to serial port COM10 by Prolific usb-to-serial…
mokNathal
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Boost shared_ptr with typedef struct

I am having compile issues with libmodbus. I have the following code boost::shared_ptr ctx; ctx->modbus_new_tcp(ip_address.c_str(), modbus_port); but I get the following error error: invalid use of incomplete type 'struct _modbus' it…
xinthose
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Modbus4J Modbus RTU master

Currently I am working with the Schneider Power Logic electrical device. I want to read the data from the device and show the value in my system. So far, I discover J2mod, Jamod and Modbus4Java library. I used all modbus4java to connect and get the…
ameruddin jamil
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Why can't the Modbus Flex Server node connect to the Modbus client?

Questions: Why am I unable to establish a connection to the Modbus Flex server? Can the settings inside the Modbus Flex server (such as coils) be configured to immediately transmit data once received? I initially used the Modbus read node, but there…
Quanta Wu
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Micropython reading MODBUS device Buffer too small error

I wrote an application in Micropython for ESP32 to read the MODBUS TCP registers of a photovoltaic inverter, the MODBUS RTU registers of PZEM 004T sensors, read and write some data obtained in the Firebase Realtime database. It turns out that after…
Edson Quaresma
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How to connect to Hawaii SmartLogger 3000 using Modbus TCP

I'm trying to query a smartlogger using modbus TCP. I used pyModbusTCP from pyModbusTCP.client import ModbusClient c = ModbusClient() c.host = 'x.x.x.x' #my smartlogger IP c.port = 502 c.debug = True regs = c.read_holding_registers(0, 10) if…
tnmesquita
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Efficient algorithm for modbusaddress scan on multiple connected devices in Python

I am trying to connect to multiple (20) separate devices using Modbus TCP. Since it is beforehand not known what the modbusaddresses are (devices are changed regularly), I want to implement a modbus address scanner. Usually, the addresses are…
MZij
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Modbus serial implementation

I'm trying to write registers using modbus-serial library. This is my code: const ModbusRTU = require("modbus-serial"); const gatewayIpAddress = "XXX.XXX.XXX.XXX"; const tcpPort = 502; const unitId = 1; const…
Deesak
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Problem establishing connection over Python Modbus TCP to a Mitsubishi Inverter

I am trying to establish a Modbus connection from a laptop to a Mitsubishi inverter (FR A-800 E series) (the manual for this connection can be found [here][1]) I am using pymodbus and I can establish a connection, but the problem comes when I try to…
Bohm Arahnmob
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Detecting value of a discrete input through pymodbus

I currently dont have access to the plc that would be implemented and am unable to find much on the internet that covers reading discrete inputs. What im aiming for is something that will detect when a prox switch is turned on which could =true or 1…
Peddlur
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