# pymodbus-dev/pymodbus

A full modbus protocol written in python

Repository: https://github.com/pymodbus-dev/pymodbus
Canonical: https://ross.abutalabs.com/products/pymodbus
Language: Python
License: NOASSERTION
License Family: other
Topics: python, modbus, modbus-rtu, modbus-tcp, modbus-serial, modbus-slave, modbus-protocol, modbus-master, modbus-library
Last push: 2026-08-25T21:23:53+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 97, longevity 100
- inputs: {"age_days": 5386, "days_push": 8, "days_rel": 20, "gap_med": 16, "n_releases_24m": 24}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2762, forks 1055 (observed 2026-08-28T04:07:18.546700+00:00)

## What it is
PyModbus is a full Modbus protocol stack written in Python, providing a client, server, and HTML-based simulator with both synchronous and asynchronous APIs. It targets communication with industrial devices like PLCs and sensors over TCP, RTU, and serial transports.

## Use cases
- read registers from a modbus PLC over TCP
- simulate a modbus slave device for testing
- poll sensors with modbus RTU over serial
- build a modbus master client in python
- write a modbus server to emulate industrial equipment
- integrate SCADA systems with python

## When to choose
- you need a mature, full-featured Modbus implementation in Python
- you want both client and server plus a simulator
- you need sync and asyncio APIs
- you communicate with standard-compliant Modbus devices

## When to avoid
- your devices rely heavily on non-standard Modbus extensions
- you need extremely low-latency or hard real-time communication
- you are not working with the Modbus protocol at all

## Facets
- artifact type: library
- maturity: stable
- function: networking, sdk, developer-tools
- domain: iot, developer-tools, embedded-systems
- platform: python, cross-platform
- tags: modbus, modbus-tcp, modbus-rtu, scada, asyncio, industrial-automation, client-server, simulator, automation

## Member repositories
- pymodbus-dev/pymodbus (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:18.546700+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:18:43.093846+00:00, confidence not recorded.
  - readme: https://github.com/pymodbus-dev/pymodbus (fetched 2026-08-28T04:07:18.546700+00:00, sha d07af76f994e)
  - registry_pypi: https://pypi.org/pypi/pymodbus/json (fetched 2026-08-29T09:56:31.090219+00:00, sha 1f4f7a2972b9)
- Data as of 2026-08-30T08:39:29.467469+00:00.