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Questions tagged [pymodbus]

Pymodbus is a python implementation of modbus protocol providing both client and slave features.

PYMODBUS is a full modbus implementation of modbus protocol using python. It provides both client and server features and supports Modbus over RTU, ASCII, TCP, UDP protocols. The library also supports both synchronous and asynchronous variants of both client and server features.

Pymodbus is supported on both on python 2.7 and python 3.x

For more info refer

290 questions
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PyModbus efficiency with out of order registers and different functions

I've recently started using PyModbus and have found it very easy to do basic polling with their ModbusTCPClient and read_holding_registers function. I'm interested now in the best ways to structure a more complex logger - non-consecutive registers,…
Oscar M
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How to read/write a device's register connected to a gateway with pymodbus via TCP

I have to read and write a sensor using pymodbus. I'm not directly connected to the sensor, but I'm connected via TCP to a gateway and the gateway is connected via serial to the sensor. I established a connection with the gateway in this way: client…
antoninus96
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Python script for RTU Modbus Slave

I am working on a automation test case for a system and need a automated modbus input device. My use case here is to implement a Raspberry pi based RTU modbus slave and connected to a modbus master. I want this Raspberry Pi based slave to populate…
vkrm
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How do I fix a PyModbus Unable to decode Response-Error with IF96015 Interface by IME

I have a PyModbus running on a Raspberry PI 3b. I have the IF96015 Ethernet Interface for the Nemo 96HD Digital Multimeter. When I try to connect to it over ModbusTCP with the PyModbus console I can ask if it is connected and it says "true" but I…
DJCheeky
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PyModbus RTU response received even if there is no connection

I'm using PyModbus on Linkit MK7688 that is connected to Arduino UNO using MAX485. Following is my code for writing to coil. from pymodbus.client.sync import ModbusSerialClient as ModbusClient import logging FORMAT = ('%(asctime)-15s…
prashant
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What is difference between pymodbus and pymodbus3 modules?

Hope you are doing great! I recently started using python for modbus communication. I want to clear my few doubts. What module is better for modbus implementation using Python - minimalmodbus, pymodbus, pymodbus3 or else. I am using python3.4 but…
Ravi C
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Write data ower Modbus tcp to HUAWEI SUN2000 KTL error

I would like to change the PV inverter settings via Modbus TCP. the system reads correctly when I write I get an error!!! I use Raspberry PI and Python. Modbus address is 40125 and data is RW (readable and writable, U16 unsigned integer (16…
Maario
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PYModbus can't replicate Modpoll register read

I have attempted many of the fixes related to pymodpoll that exist on this platform. I am able to successfully write to the register but I am unable to read from it, I have confirmed that the register I am attempting to read from is in fact a RW…
Hos
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pymodbus sending data from PC to raspberry

I am trying to transfer data from PC to Raspberry PI 3B+ using pymodbus library. I want to send data by Modbus Slave program on my PC. To get the connection I an using CH340 modbus-USB converter, but it's not working. This is the code I am using on…
Albert B
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Finding slave devices with Python pymodbus

I have a device connected to the computer's COM port and communicating with it via the Modbus protocol. Up to 40 of the same slave devices can be connected to this unit. How to find all slave devices using Pymodbus? I know that in order to…
Etozeigor
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Reading modbus registers

I have python script which reads registers from energy meter and saves values to database. Script was working fine until today when i tried to run it and i got error: AttributeError: 'ModbusIOException' object has no attribute 'registers' I can…
user13592259
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pymodbus package import error - modulenotfound

Raspberry Pi 4 running Raspian (most current as of 02/09/2023), Python 3.9.2. Installed Pymodbus with pip3 install -U pymodbus[twisted] (detail: it said twisted was not available). When I run my code in Python I get the error ModuleNotFoundError:…
Clóvis Fritzen
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Mimic Chint DDSU666 Meter with python

i am looking for some help. i already figured out how to read the Chint DDSU666 energy meter, these meters are used with modbus RTU to communicate with solar battery inverters. so i would like to mimic this type of meter to adjust charging and…
Baptist Vermeulen
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Why does Pymodbus change baudrate when running on linux without requesting a baudrate change?

I have python3 program that acts as a Modbus Master. I start a ModbusSerialClient and then proceed to read register from the slave. This is working fine on Windows. The issue is that on Ubuntu I am seeing that the ModbusSerialClient keeps changing…
Ricard Molins
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How to read slave modbus holding registers by pymodbus?

I am trying to read holding registers over Modbus RTU with python. I can make it work with the minimalmodbus library, but not with the pymodbus library. What has so far worked is the minimalmodbus library: `import…
Jan
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