Ploxc

Modbux

A Modbus client & server simulation tool born from four years of commissioning frustration.

Read, write, scan, and simulate with full datatype support. See every interpretation at once. Test before you're going on-site.

Download Documentation

Features

Client Mode

Read and write registers with 11 data types. See all numeric interpretations at once. Scan unit IDs and register ranges. Big/little-endian support with scaling factors.

Server Mode

Simulate up to 10 Modbus devices with 256 unit IDs each. Static or random value generation. Instant auto-start for quick testing.

Split Mode

Run client and server side-by-side in separate windows. Test against your own simulations locally before going on-site.

TCP & RTU

Full Modbus TCP and RTU support with automatic COM port discovery. No more manual port configuration.

Supported Data Types

INT16

INT32

INT64

UINT16

UINT32

UINT64

FLOAT

DOUBLE

Timestamp

UTF-8 String

Boolean

Getting Started

Download the latest release for Windows or macOS from GitHub.

Windows

Download the .exe from releases. If SmartScreen warns you, click "More info" then "Run anyway".

macOS

Download the .dmg from releases. First time: right-click the app and select "Open".

Build from Source

git clone https://github.com/ploxc/modbux.git
cd modbux
yarn
yarn dev

Pro Tip

Saved configs are JSON. Show Claude or ChatGPT a few example registers, paste your device documentation, and ask it to complete the mapping. Load it back into Modbux.