⚡ Modbus open-source library "Visual Lab"

Select library → Configure parameters → Automatically generate code, all with Chinese comments. Covers 12 mainstream libraries in Python, C, C#, Java, Node.js, Go, and Rust, with 8 types of function codes, three transmission modes (TCP/RTU/ASCII), and dual modes of client + server.

12 open-source librariesFull coverage of 8 types of function codesChinese annotationOne-click copyReady-to-use

📦 Choose an open-source library

Click the card to select the library, and the code generator below will automatically switch. The small icon in the top right corner is:TCP RTU Server

TCPRTUSRV

Python

pymodbus

⭐ 2.3k · TCP/UDP/RTU/ASCII · Full-duplex · asyncio

RTU

Python

minimalmodbus

⭐ 800 · Minimalist RTU · One-line read register · Lightweight

TCPRTUSRV

libmodbus

⭐ 1.4k · C language standard implementation · Embedded compatible · Linux/Win

RTUSRV

C (Embedded)

FreeModbus

STM32/ESP32/AVR · Slave-specific · no_os · Callback architecture

TCPRTUSRV

NModbus

NuGet Preferred · TCP/RTU/ASCII · Standard Configuration for Windows Host Computers

TCPSRV

FluentModbus

High performance · Zero allocation · Native async · .NET 6+

TCPRTUSRV

Java

digitalpetri/modbus

Java 17+ · CompletableFuture full asynchrony

TCPSRV

Java

EasyModbus

The simplest synchronous API · Enterprise-level · Java+NET dual versions

TCPSRV

Java

jamod

Pioneer-level Java Modbus · Preferred for Teaching · Clearly Layered

TCPRTUSRV

Node.js

modbus-serial

⭐ 700 · TCP/RTU/ASCII · Edge Gateway · Raspberry Pi

TCPRTU

goburrow/modbus

High concurrency · Native coroutines · TCP+RTU client

TCPRTUSRV

Rust

rmodbus

Zero overhead · no_std · Can be embedded into servers

🔧 Code generator

Real-time generation pymodbus

transmission method Role

Slave address (Unit ID, 1-247) function code

starting address

Quantity/Value

TCP host/IP

TCP port

⬆ Change any parameter, and the code will update automatically

Python

📊 12 Library Function Comparison

characteristic	pymodbus	minimal	libmodbus	FreeModbus	NModbus	FluentM	dig.petri	EasyM	jamod	modbus-ser	goburrow	rmodbus
TCP Client	✔	✘	✔	✘	✔	✔	✔	✔	✔	✔	✔	✔
TCP Server	✔	✘	✔	TCP	✔	✔	✔	✔	✔	✔	✘	✔
RTU Client	✔	✔	✔	✘	✔	✔	✔	✔	✔	✔	✔	✔
RTU Server	✔	✘	✔	✔	✔	✔	✔	✔	✔	✘	✘	✔
ASCII	✔	✘	✔	✔	✔	✘	✘	✔	✔	✔	✔	✘
asynchronous	✔	✘	✘	✘	✔	✔	✔	✘	✘	event	✘	✘
embedded	✘	✘	✔	✔	✘	✘	✘	✘	✘	Pi	ARM	✔
Installation method	pip	pip	apt/pkg	source code	NuGet	NuGet	Maven	NuGet/Maven	JAR	npm	go get	cargo
License	BSD-3	Apache2	LGPL2.1	BSD	MIT	MIT	Apache2	MIT	Apache2	ISC	BSD-3	MIT/Ap2

🚀 Quick installation & minimal example for each library

✅ Code has been copied to clipboard