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Questions tagged [pymodbus3]

48 questions
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pyModBus : check if coil is True or False

I am trying to learn how to introduce values to a PLC trough python ModBus module what I'm currently trying to do is just to read the value of coil 1 to check if its True or false so I am using order_ready = client.read_coils(0,…
victorR
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Python read modbus over TCP

I have a modbus device and have connected a modbus RTU to ethernet converter ( and not modbus RTU to modbus TCP converter ). All modules I have come across can read normal Modbus RTU, Modbus TCP, Modbus ASCII. But I haven't seen any module to read…
mrid
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Modbus on a PI using Python works, but only empty results

In my first Modbus experiment on a PI, I can connect to the device. But all values I get returned are zero. As you can see from my code, I am new to this. What am I doing wrong? from pymodbus.client.sync import ModbusSerialClient client =…
JeromeBu1982
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Can I read Modbus RS485 data received on a slave computer with Python?

I am working on a slave computer and want to save the data transmitted from the master via Modbus RS485, into a text file. The master computer constantly send writing and reading request to the slave computer I am working on, below is a picture…
Yang
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Pymodbus in RaspberryPi 3

I am trying to get data from a modbus device through pymodbus in raspberrypi 3 from pymodbus.client.sync import ModbusSerialClient as ModbusClient client = ModbusClient(method = 'rtu', port = '/dev/ttyUSB0', baudrate =…
Hsn
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Python, using variables in pymodbus.utilities.computeCRC

I am searching for days, if I used the wrong search strings, I am sorry. I want to use "pymodbus.utilities.computeCRC" to calculate the CRC value to communicate with a Modbus device that uses proprietary code, so no default "read register" functions…
dakoal
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how to read file request with pymodbus

Actually I'm working with modbus protocol, and I need make a program using pymodbus library however I don't know many things about this protocol. I know to do basic somethings, for example: read input/holding registers but I need read the waveforms.…
Gilberto Marcial
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MasterDriverAgent.agent not calling modbus interface class

We are trying to implement a MasterDriverAgent in VOLTTRON that communicates with a simulated pymodbus asynchronous server on a remote machine within a local network. From the VOLTTRON log, it looks like the agent never calls the modbus.py…
jmattfeld
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Control Orientalmotors AZ with pymodbus via Modbus RTU (RS485)

I would like to control four stepper motors with my Python program. The motors are driven by four AZD-KD drivers from Orientalmotor. These can be controlled by RS485 via Modbus RTU. The library pymodbus can be used for this (version 3.3.2). There is…
AndyEverything
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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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How to use write_single_register function in pymodbustcp library

Using RTDS's MODBUS communication protocol, we intend to communicate with Python using the pyModbusTCP library. The register was assigned by mapping the components of the system modelled by RTDS as follows # RIR: Read Input Registers (16 bit word,…
joonbyeok Hwang
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Write to Device Command Register with Pymodbus Python

I have a device connected to a computer's COM port. Communication with the device takes place via the modbus protocol. I need to read some information from this device - the event log. The instrument documentation is not very extensive, but it says…
Etozeigor
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Unable to read correct register from pymodbusrtu server using controller (in my case TEMCO)

I have created a modbusrtu server using pymodbus library on Pi4.I am writing values on the context using the function def write_data(context,address, value, slave_id_reader,reg_type): context = context print(" Adddress =",address,",…
Umer Farooq
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How to capture Raw Bytes using pymodus and How to create Interrupt which prints / returns raw request or response when it is receieved?

I have started the modbus rtu server using the following code. server=StartSerialServer(context, framer=ModbusRtuFramer, identity=identity, port='/dev/ttyUSB0', timeout=1, …
Umer Farooq
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pymodbus can't understand the slave's response

I copied this code into the pymodbus documentation: from pymodbus.client.sync import ModbusSerialClient client = ModbusSerialClient( method='rtu', port='com3', baudrate=9600, timeout=3, parity='N', stopbits=1, …
Fabio Martins
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