◈ Desktop App

Modbus Client
& Server Simulator

Monitor, write, and simulate Modbus RTU & TCP devices on macOS, Windows, Linux, and Android. Built-in TCP Server, MQTT publishing, and CSV logging — no hardware required.

Download

macOS iOS 🪟 Windows 🐧 Linux 🤖 Android View Features

macOS · Apple Silicon · v0.1.11  ·  Windows · x64 · v0.1.11  ·  Linux · x64 · v0.1.11  ·  Android · Google Play

Modbus Poll — macOS
Modbus Poll — Windows
Modbus Poll — Linux
Modbus Poll — iOS & Android

Features

Everything you need for Modbus testing

Built with Tauri + Rust for native performance on macOS, Windows, and Linux, with a clean, minimal interface.

🔌
RTU Serial Connection
Connect via any serial port with full configuration — baud rate, data bits, stop bits, parity, and timeout.
🌐
TCP/IP Connection
Connect to Modbus TCP devices over the network. Configure host IP, port (default 502), and connection timeout.
📡
Read Registers
Supports FC01 (Coils), FC02 (Discrete Inputs), FC03 (Holding Registers), and FC04 (Input Registers).
✏️
Write Registers
Write single or multiple coils and registers with FC05, FC06, FC15, and FC16 function codes.
🔄
Auto Polling
Continuous polling at configurable intervals (100ms – 60s). Track TX, RX, and error counters in real time.
🔢
28 Display Formats
From 16-bit integers to 64-bit doubles, with signed, unsigned, hex, and binary views plus AB CD / CD AB / BA DC / DC BA byte ordering built in. Override the format per register, independent of the global setting.
⇅
MQTT Publishing
Stream live register readings to any MQTT broker, with TLS and authentication support. Feed dashboards, Node-RED, Home Assistant, or your own pipeline.
📝
CSV Data Logging
Export live register readings straight to a CSV file as they arrive, with no size limit — ideal for long-running data collection and offline analysis.
📈
Combined Chart View
Overlay up to 8 registers on a single graph with a toggleable legend — perfect for comparing related values side by side.
🖥️
TCP Server Simulator
Run a built-in Modbus TCP slave directly from the app. Respond to FC01–FC16 requests from any master on your network. No hardware required.
🎲
Random Data Generator
Auto-randomize holding registers, input registers, coils, or discrete inputs on a configurable interval (250ms–5s). Perfect for stress-testing HMIs and dashboards.
🔍
Serial Scan
Automatically find a device's slave ID or baud rate over RTU serial — no more guessing connection settings.
📶
LAN Scan
Discover Modbus TCP devices on your network by scanning an IP/subnet and host range, with configurable timeout.

Specifications

Technical Details

Platform
macOS · Windows · Linux · Android
Architecture
Apple Silicon · x64
Version
0.1.11
macOS Installer
Mac App Store
Windows Installer
MSI (x64)
Linux Installer
deb / rpm / AppImage
RTU Protocol
Modbus RTU
TCP Protocol
Modbus TCP
Default TCP Port
502
Slave ID Range
1 – 247
Max Registers
125 / poll
Built With
Tauri + Rust

Download

Get Modbus Poll

Apple

macOS

Version 0.1.11 · Apple Silicon

⬇ Download on App Store

Available on the Mac App Store.

Apple

iOS

App Store

⬇ Download on App Store

Available on the App Store for iPhone.

🪟

Windows FREE

Version 0.1.11 · x64 · MSI Installer

⬇ Download for Windows

Free MSI installer for Windows x64.

🐧

Linux FREE

Version 0.1.11 · x64 · deb / rpm / AppImage

⬇ Download .deb

Also available:

🤖

Android FREE

Google Play

⬇ Get it on Google Play

Available on Google Play.

🐧 Linux Installation

.deb (Debian / Ubuntu) sudo dpkg -i "Modbus Poll_0.1.11_amd64.deb"
.rpm (Fedora / RHEL) sudo rpm -i "Modbus Poll-0.1.11-1.x86_64.rpm"
.AppImage (Any distro) chmod +x "Modbus Poll_0.1.11_amd64.AppImage" && ./"Modbus Poll_0.1.11_amd64.AppImage"
.deb (Debian 10 / Astra Linux) sudo dpkg -i "modbus-poll_0.1.11_amd64_debian_10.deb"

Changelog

Release Notes

What's new in recent Modbus Poll updates.

Latest 0.1.11
  • MQTT publishing — stream live register readings to any MQTT broker, with TLS and authentication support, to feed dashboards, Node-RED, Home Assistant, or your own automation pipeline.
  • Per-register format override — set a display format (Signed, Float, Double, etc.) for an individual register, independent of the global format setting.
0.1.10
  • Real-time CSV data logging — export live register readings straight to a CSV file (opens directly in Excel) as they arrive, with no size limit. Great for long-running data collection.
  • Changed the default TCP Server / Client port to 5020 (from 502) and default host to 127.0.0.1, so the built-in Server Simulator works out of the box on macOS — you can still connect to real devices on port 502 by entering it manually.
  • Stability and macOS App Store packaging fixes so the TCP Server Simulator and CSV logging work correctly in the sandboxed release.
0.1.7
  • Hexadecimal address input — type addresses like E376H or 0xE376 directly into Start Address, Write Address, and Scan Address fields.
  • 28 register display formats — Signed, Unsigned, Hex, Binary, 32-bit Long (signed/unsigned), 32-bit Float, 64-bit Integer (signed/unsigned), and 64-bit Double — each with the 4 standard byte-order options (AB CD / CD AB / BA DC / DC BA).
  • Combined Chart view — overlay up to 8 registers on a single graph with a toggleable legend, for easy side-by-side comparison.
  • Expanded the built-in TCP Server Simulator to the full 0–65535 register range, and increased max Quantity for Read Coils / Read Discrete Inputs to 2000.
0.1.5
  • Live register charting — sparkline trend view with history for every polled register.
  • Custom formula support — scale raw register values to real-world units (e.g. x/10).
  • Register aliases — name your registers for easier reading.
  • Refreshed color theme and UI polish.

Also from the Developer

More Tools You Might Like

IceQL
New Product
IceQL
A modern, lightweight SQL client for macOS — built with Rust for blazing fast performance. Connect to your databases, run queries, and explore your data, all in a clean, minimal interface.
Visit IceQL →
Direct Print
macOS App
Direct Print
Silent POS printing from any web app — no print dialog, no pop-up. A lightweight macOS menu bar app that lets your web-based cashier print receipts directly to any thermal or dot matrix printer.
Visit directprint.app →