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.
In a Nutshell, Pymodbus-old...
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took an estimated 1 years of effort (COCOMO model)
starting with its first commit in October, 2015
ending with its most recent commit about 7 years ago
Quick Reference
BSD 4-clause (University of California-Specific)
Permitted
Commercial Use
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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
Vulnerability Exposure Index
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30 Day SummaryJun 29 2026 — Jul 29 2026
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12 Month SummaryJul 29 2025 — Jul 29 2026
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