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Project Summary

Pymodbus is a full Modbus protocol implementation using a synchronous or asynchronous (using asyncio) core.

Supported modbus communication modes: tcp, rtu-over-tcp, udp, serial, tls

Pymodbus can be used without any third party dependencies (aside from pyserial) and is a very lightweight project.

Pymodbus also provides a lot os ready to use examples as well as a server/client simulator which can be controlled via REST Api and can be easily integrated into test suites.

Requires Python >= 3.8

The tests are run against Python 3.8, 3.9, 3.10 on Windows, Linux and MacOS.

Tags

modbus protocol python rs232 rs485 scada twisted uart

BSD 4-clause (University of California-Specific)
Permitted

Commercial Use

Modify

Distribute

Place Warranty

Forbidden

Hold Liable

Use Trademarks

Required

Include Copyright

Include License

These details are provided for information only. No information here is legal advice and should not be used as such.

Project Security

Vulnerabilities per Version ( last 10 releases )

There are no reported vulnerabilities

Project Vulnerability Report

Security Confidence Index

Poor security track-record
Favorable security track-record

Vulnerability Exposure Index

Many reported vulnerabilities
Few reported vulnerabilities

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About Project Security

Languages

Python
99%
5 Other
1%

30 Day Summary

Jan 14 2026 — Feb 13 2026

12 Month Summary

Feb 13 2025 — Feb 13 2026
  • 182 Commits
    Down -231 (55%) from previous 12 months
  • 23 Contributors
    Down -14 (37%) from previous 12 months

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