modbus-tk

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Welcome on modbus_tk discussion group.
modbus_tk is a implementation of the modbus protocol in Python. It supports master and slave developpent for modbus TCP or RTU.

This is the right place for people who wants looking for help when using this lib. Newbies and experts are welcomed.
It is also a place for any discussion around PLC and automation development with Python.

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Mar 25

Slave missing communication with its master

Hi, I wounder if anyone have noticed if there is a way for the slave to inform the application if the

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Slave missing communication with its master

Hi, I wounder if anyone have noticed if there is a way for the slave to inform the application if the

Mar 25

Muhammad Hunzala Ayub Awan

10/21/22

Modbus-tk Master Android App

Hi, just wondering is there any open source modbus-tk master app built for android?

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Modbus-tk Master Android App

Hi, just wondering is there any open source modbus-tk master app built for android?

10/21/22

10/21/22

MODBUS - Beginner Level Information to build an MODBUS Gateway

I am new to MODBUS and Fieldbus protocols. However I am trying to learn it. My tasks currently is to

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MODBUS - Beginner Level Information to build an MODBUS Gateway

I am new to MODBUS and Fieldbus protocols. However I am trying to learn it. My tasks currently is to

10/21/22

Oyonika Samazder, alex chiosso2

5/5/22

Testing the limits of the Modbus protocol

Hi Oyonika. The Modbus protocol has its own rules and specifications, moreover it's a "

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Testing the limits of the Modbus protocol

Hi Oyonika. The Modbus protocol has its own rules and specifications, moreover it's a "

5/5/22

alex jiang crazy stone

2/25/22

use modbus_tk as modbus slave for function code 43

hi all, I tried to use the modbus_tk as the modbus slave to test the function code 43 / 14 (0x2B /

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use modbus_tk as modbus slave for function code 43

hi all, I tried to use the modbus_tk as the modbus slave to test the function code 43 / 14 (0x2B /

2/25/22

Nicolas Rodriguez

1/3/22

Modbus-tk interferes with pyvisa

Hello all, I am using modbus-tk to talk to an egauge, however, I also want to talk to a dmm through

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Modbus-tk interferes with pyvisa

Hello all, I am using modbus-tk to talk to an egauge, however, I also want to talk to a dmm through

1/3/22

12/25/21

How to handle disconnected slave.

I am using modbus rtu as master. When the slave are not connected to the serial port, master could

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How to handle disconnected slave.

I am using modbus rtu as master. When the slave are not connected to the serial port, master could

12/25/21

Ivo van der Hout

10/1/21

handle request failed: Invalid CRC in request

Dear Luc, We are using the Modbus_tk in a script, it was working fine. Yang was a collegue of mine

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handle request failed: Invalid CRC in request

Dear Luc, We are using the Modbus_tk in a script, it was working fine. Yang was a collegue of mine

10/1/21

6/25/21

Pymodbus Vs Modbus-tk

Hi, I am new in Modbus, I need to implement a gateway (raspberry-Pi) Modbus TCP client to connect

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Pymodbus Vs Modbus-tk

Hi, I am new in Modbus, I need to implement a gateway (raspberry-Pi) Modbus TCP client to connect

6/25/21

Ken Boyd, Júnior Ferraz3

4/1/21

Modbus RTU over TCP Master Example

Thank You! Ken B On Thu, Apr 1, 2021 at 1:21 AM Júnior Ferraz <ferrazj...@gmail.com> wrote:

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Modbus RTU over TCP Master Example

Thank You! Ken B On Thu, Apr 1, 2021 at 1:21 AM Júnior Ferraz <ferrazj...@gmail.com> wrote:

4/1/21

3/15/21

You would need an example of how to implement RTU over TCP communication. I have something done in

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You would need an example of how to implement RTU over TCP communication. I have something done in

3/15/21

Ragy Samy, Luc JEAN3

3/14/21

Modbus RTU Commands Explanation

Thank you sir for your concern and reply .. but I don't think that I quite understood what meant

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Modbus RTU Commands Explanation

Thank you sir for your concern and reply .. but I don't think that I quite understood what meant

3/14/21

3/2/21

New to modbus. Working with PZEM004Tv (datasheet) and test code (pzem-004.py) Board functions

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New to modbus. Working with PZEM004Tv (datasheet) and test code (pzem-004.py) Board functions

3/2/21

Andreas Haveland

2/10/21

Hi. I have found your Modbus_tk code, and wanted to give it a try. However i'm not familiar with

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Hi. I have found your Modbus_tk code, and wanted to give it a try. However i'm not familiar with

2/10/21

Ehtisham Asghar

2/9/21

HI guys! I am new to Modbus communication, and I want to use it for reading and writing signal by

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HI guys! I am new to Modbus communication, and I want to use it for reading and writing signal by

2/9/21

Nissim Derdiger2

1/5/21

Response length is invalid 0

Hi again, Found my problem - I've forgot to add this line: master.set_verbose(True) that's

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Response length is invalid 0

Hi again, Found my problem - I've forgot to add this line: master.set_verbose(True) that's

1/5/21

Motorola_Bob, … trinadh k8

9/9/20

attempting to read registers on Watlow F4 temperature chamber controller via modbus_rtu instance

Thanks for the responses, I am having a thermal chamber from Espec which uses watlow F4 temperature

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attempting to read registers on Watlow F4 temperature chamber controller via modbus_rtu instance

Thanks for the responses, I am having a thermal chamber from Espec which uses watlow F4 temperature

9/9/20

Jean-Simon LaRochelle, Luc JEAN3

3/26/20

Using a hook to trap holding registers write on a slave

Hello Jean-Simon, Well done and thanks for sharing. Best luc Le 24 mars 2020 à 19:51, Jean-Simon

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Using a hook to trap holding registers write on a slave

Hello Jean-Simon, Well done and thanks for sharing. Best luc Le 24 mars 2020 à 19:51, Jean-Simon

3/26/20

1/23/20

Hi All, While simulating modbus_payload code i'm getting few errors. I am attaching that

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Hi All, While simulating modbus_payload code i'm getting few errors. I am attaching that

1/23/20

1/23/20

Modbus_tk / tcpslave_example

Hi All, I'm facing problem to understanding below code. Please help me to explaining. Thanks,

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Modbus_tk / tcpslave_example

Hi All, I'm facing problem to understanding below code. Please help me to explaining. Thanks,

1/23/20

1/22/20

Modbus server example code exaplanation

Hi All, I am new to MODBUS environment. And i want to learn that on python. So can any help me on

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Modbus server example code exaplanation

Hi All, I am new to MODBUS environment. And i want to learn that on python. So can any help me on

1/22/20

Scott Anderson, Luc JEAN2

12/3/19

Modbus TCP - RS232 Gateway

Hello Scott, By default, modbus-tk just make possible to read/write values from memory. You can look

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Modbus TCP - RS232 Gateway

Hello Scott, By default, modbus-tk just make possible to read/write values from memory. You can look

12/3/19

Paolo Ferrentino, … Luc JEAN4

11/22/19

minimal documentation

Hello Jackson, Thanks you for your help on documentation. I will be pleased to include in the project

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minimal documentation

Hello Jackson, Thanks you for your help on documentation. I will be pleased to include in the project

11/22/19

Greg Madden, … Samrat Hossain3

9/25/19

Establishing a Modbus TCP connection with PLC

hai, I am new I would connect with PC to a PLC over Modbus TCP. Plz help me how may i do this

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Establishing a Modbus TCP connection with PLC

hai, I am new I would connect with PC to a PLC over Modbus TCP. Plz help me how may i do this

9/25/19

8/26/19

Read modbus registers from csv file

Hi, I'm new to python and I would like to use modbus_tk in my project. I've a device from

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Read modbus registers from csv file

Hi, I'm new to python and I would like to use modbus_tk in my project. I've a device from

8/26/19

Mike Spath, Luc JEAN8

6/21/19

More information needed on utils.create_logger

Hi Luc: No worries, thank you for your help. I'm so close to getting this to work.... Mike On Fri

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More information needed on utils.create_logger

Hi Luc: No worries, thank you for your help. I'm so close to getting this to work.... Mike On Fri

6/21/19

6/19/19

does the Modbus-tk handle CRC responses?

Hello: Pardon the basic question on this but I have just started to use a real PLC to act as a master

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does the Modbus-tk handle CRC responses?

Hello: Pardon the basic question on this but I have just started to use a real PLC to act as a master

6/19/19

Mike Spath, Luc JEAN11

6/13/19

Starting to use modbus-tk library

I'm able to pack('HH', values[0], values[1]) then unpack that as a float and now I see

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Starting to use modbus-tk library

I'm able to pack('HH', values[0], values[1]) then unpack that as a float and now I see

6/13/19

Brad Natelborg2

5/9/19

Modbus-Tk RTU Server

Answered my own question. You can set the `error_on_missing_slave` flag to `False`. server =

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Modbus-Tk RTU Server

Answered my own question. You can set the `error_on_missing_slave` flag to `False`. server =

5/9/19

Jagpreet Walia, Luc JEAN3

2/15/19

Defining Registers from multiple slaves of different types

Hi Luc I am developing a master and want to read data from slave meters (Schneider, Veris, abb etc.)

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Defining Registers from multiple slaves of different types

Hi Luc I am developing a master and want to read data from slave meters (Schneider, Veris, abb etc.)

2/15/19

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