M4uhd New - Domain Portable

Test, debug, and simulate Modbus devices without physical hardware. Live data monitoring, fault simulation, and real-time register testing. Master + Slave modes included — no subscriptions, no separate purchases.

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Both Modes Included Master + Slave in one app (competitors charge separately)
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One-Time Payment Pay $99 once, use forever (no monthly fees)
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All Protocols TCP, UDP, RTU, ASCII + 4 hybrid modes
⬇ Download Free — v1.1.2 (Windows) Buy Full License — $99

Windows 10/11 · 64-bit · Free 30-day trial · No credit card · Download page →

14Function Codes
8Protocol Variants
4 NEWDiagnostic Tools
$0/monthForever

See It in Action

A modern, intuitive interface for professional Modbus testing and simulation.

Modbus Simulator - Master Mode with data grid and live polling
Modbus Simulator - Address Scanner discovering devices Address Scanner
Modbus Simulator - Live data charts Live Charts
Modbus Simulator - Connection settings Connection Setup

Watch the Demo

Once upon a time in the vast, shifting digital landscape, there was a popular destination known as

, the site operates through various mirrors and clones, requiring users to navigate with caution due to the unofficial nature of the content. Current M4uHD Domains (April 2026)

Free and Legal Options:

The Need for a New Domain

Example short tech snapshot (model)

Why Is It Only $99?

Direct pricing. No marketing overhead. No subscriptions. Just great software.

Typical Competitors

Expensive
Master Tool: $129
Slave Tool: $129
+
Annual Support: $89/year
Year 1 Total: $347
3-Year Cost: $525
  • ✗ Separate Master & Slave licenses required
  • ✗ Limited protocol support
  • ✗ Annual support fees
  • ✗ Fewer function codes

Modbus Simulator

Best Value
Master + Slave: $99
Lifetime Updates: $0
+
Forever Support: $0
Year 1 Total: $99
3-Year Cost: $99
  • ✓ Both modes included FREE
  • ✓ 8 protocol variants (most in industry)
  • ✓ Free updates forever
  • ✓ 14 function codes (industry-leading)
Save $426 over 3 years — and get more features than competitors offer

Everything You Need for Modbus Testing

One tool. Both sides of the protocol. Full visibility. Master + Slave included — competitors charge separately.

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8 Protocol Variants

TCP, UDP, RTU, ASCII, RTU-over-TCP, ASCII-over-TCP, RTU-over-UDP, ASCII-over-UDP. RS-485 RTS toggle and local echo support. m4uhd new domain

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14 Function Codes

FC01-06, FC08 Diagnostics, FC11 Event Counter, FC15/16 multi-write, FC17 Report Server ID, FC22 Mask Write, FC23 Read/Write, FC43 Device Info. Once upon a time in the vast, shifting

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Live Data Charts

Real-time line charts with up to 8 simultaneous address traces. Color-coded, auto-scrolling, time-based display. shifting digital landscape

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21+ Display Formats

16-bit signed/unsigned/hex/binary/BCD, 32-bit float (4 byte orders), 64-bit double, 32/64-bit long, and ASCII string.

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Data Logging & Export

Log to CSV or XLSX in real-time. Print or export to PDF. REST API for Excel/VBA integration. Full communication logger with TX/RX hex data.

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Advanced Diagnostics ✨ ENHANCED

NEW: Raw frame analysis, exception injection, burst/adaptive polling, frame-level diagnostics. PLUS: Test Center, Address Scanner, color rules, scaling/offset, broadcast mode, ENRON/DANIEL addressing.

Two Modes. One Application.

Master Mode

Poll & Control Devices

  • Connect via TCP, UDP, RTU, ASCII, and all cross-framing variants
  • Configure multiple simultaneous polls
  • 14 function codes including diagnostics and device info
  • Write single or multiple coils and registers
  • Address scanner and raw frame test center
  • Broadcast support (Slave ID 0) and ENRON/DANIEL addressing
Slave Mode

Simulate Devices

  • Emulate a Modbus slave for testing masters
  • TCP, UDP, RTU, and ASCII server modes
  • Configurable memory: up to 10,000 registers per type
  • Edit register values in real-time
  • View incoming request log with function codes
  • Configurable slave ID

Flexible Data Display

21+ display formats with 4 byte-order options. Scaling, offset, and conditional color rules.

Unsigned
Signed
Hex
Binary
BCD
Float32
Float64
Long32
Long64
ASCII String

M4uhd New - Domain Portable

Once upon a time in the vast, shifting digital landscape, there was a popular destination known as

, the site operates through various mirrors and clones, requiring users to navigate with caution due to the unofficial nature of the content. Current M4uHD Domains (April 2026)

Free and Legal Options:

The Need for a New Domain

Example short tech snapshot (model)

Get Started

Download includes a 30-day free trial. No credit card required.

Download Now

Windows 10/11 · 64-bit · 118 MB

Windows SmartScreen Warning?

After downloading, Windows may show a "Windows protected your PC" warning. This is normal for new software. To install:
1. Click "More info"
2. Click "Run anyway"
The app is 100% safe — no malware, no adware.