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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 protocal 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

203 questions
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How to implement a message with a custom function code in pymodbus?

I'm currently trying to implement a modbus request that has a custom function code. The implementation is based on this example: custom_message.py import struct from pymodbus.pdu import ModbusRequest, ModbusResponse from pymodbus.client.sync import…
laberning
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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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Auto Discovery of the slave id of modbus device in a network

How to determine whether device connected to the network is modbus device after getting valid ip range through broadcasting mechanism or How to Auto Discover the slave id of modbus device connected to the gateway ?
Ayushi Gupta
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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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pymodbus: request creation and response receiving

Can anyone explain how to create the request and get the response in right way using pymodbus via Modbus TCP/IP? I have the PLC which I want to use as slave and PC - as master. I trying to do it in such way: from pymodbus.client.sync import…
user2739393
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Decoding Holding Registers to binary format

Need help decoding storage registers to binary format. When reading, I get a value from 8 to 15 bits. I can't read the value from 0 to 7 bits, I want to count bits 0-15 as a request, but 8-15 comes in. What am I doing wrong? I tried different…
fess1100
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Noob trying to get values from his EnergyMeter via Modbus RTU RS485 in python

fist Post as i normaly find the answers if i search long enough. But today is the day... I bought a EnergyMeter from Aliexpress with MODBUS RTU connection and im trying to read it out. I already tried a lot of stuff from all over the Internet. This…
Marv21
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Having Trouble converting a string to bytes

I'm trying to convert a string to a byte, thats what I've done. I want to send out a Modbusprotocol via serial and put it together in bitstring: tiger = '01' read = '03' ac_val = '0031' word = '0002' code =…
Tec_Ley
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Minimalmodbus I can read data, but i cannot write it (RTU)

I´m using minimalmodbus python library to communicate my Raspberry Pi with "Spacelogic Thermostat TC900" (RTU). I have no problem reading the data, but when I try to write on it, the console shows the next error: No communication with the instrument…
javiertxu18
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After read holding registers with Pymodbus connection is broken in Raspberry Pi

import pymodbus from pymodbus.client.sync import ModbusTcpClient from time import sleep connection = False data = {} while True: if not connection: client = ModbusTcpClient(host="176.219.185.16", port="502") …
Adem Berk Aksoy
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Reading More Than One Slave Sequentially With Pymodbus

2 slaves(devices) are working. I use slave units #2 and #5. MPR_46S in #5, Thermometer in #2. Slave addresses are not read sequentially, so I need to read an empty slave address that i named 'Slave…
Ozgurserinkaya
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Pymodbus Asynchronous Server with RTU framer not working

I'm trying to implement a modbus asynchronous serial server with the library Pymodbus. I'm using a ModbusRtuFramer as a frame template. Unfortunately, when I send a command, it looks like the bytes are splitted and the frame is not recognized. I…
bui3
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MODBUS for Python proper referencing

I'm using pymodbus to attempt to access data on a Morningstar Solar Controller. I have the MODBUS documentation for the controller here and it lists where the values are in the registry. I'm really only looking for a few values in the Read Holding…
NickKatchur
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How to get pymodbus to correctly communicate with PLC?

Before I ask, I just want to mention that I have spent a few days researching this and can't seem to find my way out of this basic issue. I have read the docs and spent time here. Otherwise I wouldn't have asked. I have inherited a massive…
driv3r
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