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Questions tagged [pymodbus3]

48 questions
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Reading registers using Pymodbus (Modbus RTU)

I am trying to communicate a Modbus slave device that uses Modbus RTU protocol, with RPi having pymodbus lib in python 3.8. Here's a link for this library http://riptideio.github.io/pymodbus/ My concern is when printing holding registers responses.…
bh96
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Simulator for multiple modbus slaves

Hello is there any tcp modbus slave simulator that could simulate 3 slaves simultaneously from one pc? Is it possible? The main concept is that i have to deal with a plc that controls some VFD although i want to imitate those VFD and give the…
LC1993
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Read RTU Pymodbus data through TCP/Forwarder

I have Energy Meter connected through RTU and i am able to get holding registers data through simple RTU Code. Now i want to make Convert this RTU to TCP through Forwarder. I want to send data to TCP which forwards the command to RTU and fetches…
Abbad
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How do you chose which slave to control in PyModbus?

So I'm doing a project where I have a Raspberry Pi 4 as master controlling 4 actuators with Modbus. I'm using PyModbus (with python 3) and I've been using code like this to test the Pi (with a PC slave simulator). client = ModbusClient(method =…
OverDemon
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Remove trailing bits from hex pyModBus

I want to built a function that sends a request from ModBus to serial in hex. I more o less have a working function but have two issues. Issue 1 [b'\x06', b'\x1c', b'\x00!', b'\r', b'\x1e', b'\x1d\xd3', b'\r', b'\n', b'\x1e', b'\x1d'] I cant remove…
victorR
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Stop python script aborting when there is no internet connection

I have a python script running on a revPi which uses Azure IOT SDK. The script basically accepts a bunch of modbus registers from a .json file, adds a few properties and sends it to Azure IOT hub for analysis. The script is currently too dependent…
Inception
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Modbus TCP Client does not connect

Background info: I am trying to read data from my energy meter. I have connected a gprs modem to the meter(via rs485) port. This modem sends data via tcp-ip protocol to a specified server and port. On the server(aws ec2 instance) I can see a…
iamjoebloggs
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How to get rid of LoopingCall in python code

I'm using Modbus server example code from pymodbus library to make a data forwarder (reading some serial data, formatting and then assigning data to modbus registers for Modbus master to read). My issue is serial delay (reading from 6 different…
coddr
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Issue while master is trying to read few registers via modbus serial console using python in raspberry Pi

I am using RasPi connected to other system via serial console. My other system is running modbus master and Raspi is acting as modbus slave. Raspi has written to some register values and master is continuously asking for some register values. Below…
Sumit
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Pymodbus converting input to the wrong address

I am trying to write to a PCON controller from a Raspberry Pi 3b using pymodbus. I have python 3.5 and pymodbus 1.4. I verified the communication path through the hardware by connecting a laptop running a modbus programming tool (this is for an…
Mike
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python use variable in Modbusclient

I am having an issue with using a variable in a function. ports = ["'/dev/ttyXRUSB0'","'/dev/ttyXRUSB1'"] for item in ports: print len(ports) #port = item print item client = ModbusClient(method = 'rtu', port = item, baudrate = 115200,…
David Delorme
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Modbus master&slave simulator

With no experience with Modbus, I'm creating a python script running on a slave computer receiving Modbus RS485 data from master ( a Siemens control computer). Then store it into a text file. The whole system is on a ship which is not so convenient…
Yang
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PYMODBUS: How to get master to communicate with slave?

I'm working on a project where I have two Debian VMs that both have Pymodbus installed. I'm trying to setup a virtual testing environment where I can perform various cyber attacks on the two from a third Kali VM while they communicate.…
Aidan
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pymodbus on RasPi read_holding_registers Returns none From Simulator

I'm trying to read holding registers from a Modbus simulator, but when I print the value in Python, I get a "none" object. The simulator does send a response, but Python seems to not receive it. I've googled for a day and have tried everything I've…
surreal
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Displaying today's date on SC2004MBS using PyModBus

I am intending to display today's date and time on Silicon Craft 2004 ModBus (SC2004MBS). I tried to left shift the value date string and pass to the device using write_registers() function. The code looks like this: @defer.inlineCallbacks def…
kushvarma
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