Registry / http-networking / pymodbusTCP

pymodbusTCP

library0.3.0pypypi✓ verified 87d ago

A simple Modbus/TCP library for Python. Current version 0.3.0, released irregularly. Provides client and server functionality for Modbus TCP communication.

http-networking

pip install pyModbusTCP

github ↗package ↗

INSTALL

IMPORT

SIG · PYMODBUSTCP

pymodbusTCP

http-networkingpythonv0.3.0

Install

1.5s avg

Import

64ms

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.3.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.068s · 18MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.5s · import 0.060s · 18MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

ModbusClient

✓ from pyModbusTCP.client import ModbusClient

✗ from pymodbus import ModbusClient

Wrong library (pymodbus)

ModbusServer

✓ from pyModbusTCP.server import ModbusServer

✗ from pymodbus.server import ModbusServer

Wrong library (pymodbus)

constants

✓ from pyModbusTCP import constants

Create a Modbus TCP client, connect, and read holding registers.

from pyModbusTCP.client import ModbusClient try: c = ModbusClient(host='127.0.0.1', port=502, auto_open=True) if c.read_holding_registers(0, 1): print('success') except Exception as e: print(f'Error: {e}')

Debug

Known issues

breakingv0.2.0 and v0.3.0 have breaking changes. Check CHANGES file before upgrading.

fix

Review CHANGES on GitHub: https://github.com/sourceperl/pyModbusTCP/blob/master/CHANGES

affects: >=0.2.0

gotchaModbusClient does not auto-close connection; must call close() or use context manager.

fix

Use with statement: with ModbusClient() as c: ...

affects: all

gotchaDefault timeout is 1 second; may cause timeout on slow networks.

fix

Set timeout parameter: ModbusClient(timeout=5)

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'pyModbusTCP'

Library not installed or wrong import casing.

fix

pip install pyModbusTCP (capital M, B, T, C, P)

pyModbusTCP.client.exceptions.ConnectionError: Connection refused

Modbus server not running or wrong IP/port.

fix

Verify server is running and reachable: ping 127.0.0.1, check port 502

ImportError: cannot import name 'ModbusClient' from 'pyModbusTCP'

Direct import from top-level package, not from submodule.

fix

Use 'from pyModbusTCP.client import ModbusClient'

Upgrade

Version history

0.3.0latest on PyPI · released Sep 4, 2024

Audit

Dependencies

No dependency data recorded yet.

Agent activity

2 hits · last 30 days

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Resources

githubhttps://github.com/sourceperl/pyModbusTCP ↗

packagehttps://pypi.org/project/pymodbusTCP/ ↗