Test, debug and monitor Modbus slave devices with a fast native Windows application. Works on Windows 10/11. No subscriptions, no cloud, no nonsense. Need live visualization? ModbusManager Pro adds a drag-and-drop Dashboard HMI.
Built for industrial engineers who need reliability, not bloat.
Full support for RTU over serial RS-232/RS-485 and TCP/IP. Reads all four register types: coils, discrete inputs, holding and input registers.
Live register values with configurable poll rates from 100ms. Visual charts, data logging and export to CSV.
Run a full Modbus slave server (TCP or RTU) right inside the app — no second device or extra software needed. Supports up to 247 slave IDs, all register types, and typed simulation (counter, sine, ramp) for 16/32-bit and Float32 values. Modbus Poll charges separately for this — we include it at no extra cost. See the full comparison.
Start in seconds with ready-made templates for common devices — ebm-papst EC fans, Huawei SmartLogger, Siemens S7-1200, energy meters and VFDs. Load a template and the right poll windows are set up for you, then adjust to your device.
Build live operator dashboards with drag-and-drop gauges, lamps, bars, trends, tanks and valves. Fullscreen runtime mode turns any PC into an HMI panel — no SCADA package needed.
Map registers to named tags with native 16/32-bit and Float32 decoding — read floating-point voltages, power and energy directly, no scripting needed. Drive logic with IEC-style Structured Text for alarms, calculations and conditional dashboard behavior.
Log register and tag values to a local database and review them over time with trend charts, selectable time ranges, per-series deadband and CSV export. Fully offline — no cloud, no separate historian server.
Define alarms on registers or tags with warning and critical levels, hysteresis and activation delay. Acknowledge alarms, keep a full alarm history, and get audible alerts — shown in a dedicated tab or on the dashboard.
Poll several RTU and TCP devices at once and republish the registers you choose as one common register map — with data type and scale conversion both ways. A PLC reads the whole installation over a single Modbus TCP connection. Modbus gateway software →
Simulate live device behavior with Counter, Sine wave, Random, and Ramp generators per register. Perfect for testing SCADA and HMI without real hardware.
Automatically scan for active slave IDs on a network or scan all register addresses in a device — essential when working with unknown hardware.
See every raw byte on the line in real time. Inspect TX/RX traffic, spot protocol errors and debug communication issues without extra tools.
Automatically reconnects after a dropped connection — no manual intervention needed. Keeps long-running monitoring sessions alive without babysitting.
Full interface available in 11 languages including Chinese, Russian, Arabic and more. Switch without reinstalling.
Switch between a clean light workspace and a low-glare dark mode in one click — comfortable on a bright factory floor or in a dim control room. Your choice is remembered.
Build and send custom Modbus requests by hand, inspect raw responses, and verify device behaviour quickly during commissioning and debugging.
No cloud, no telemetry, no internet connection required. Your industrial data stays on your machine, always.
Save a whole setup — poll windows, tags, dashboards, chart series, slave blocks and scripts — into one workspace file. Reopen it next week or hand it to a colleague and everything is exactly as you left it.
ModbusManager reads SUN2000 inverter data directly from the SmartLogger Modbus Remapped register scheme. Our step-by-step guide covers the address formula, register map, scaling and FC03 polling.
Both editions include the full Modbus master & slave toolset. Pro adds the Dashboard HMI — gauges, trends and a fullscreen runtime mode, and a Modbus gateway that merges several devices into one register map for a PLC.
| Feature | Standard | Pro |
|---|---|---|
| Modbus RTU, TCP & ASCII master | ✓ | ✓ |
| Built-in Slave Mode & register simulation | ✓ | ✓ |
| Serial Monitor, Test Center, Slave & Address Scan | ✓ | ✓ |
| Charts, scaling, conditional colors, workspaces | ✓ | ✓ |
| Auto-reconnect & 11-language UI | ✓ | ✓ |
| Device templates (quick start for common devices) | ✓ | ✓ |
| Native 16/32-bit & Float32 tag decoding | ✗ | ✓ |
| Drag-and-drop Dashboard HMI canvas | ✗ | ✓ |
| Gauges, lamps, bars, trends, tanks, valves & more | ✗ | ✓ |
| Fullscreen runtime mode (operator view) | ✗ | ✓ |
| Snap-to-grid, undo/redo, z-order, PNG export | ✗ | ✓ |
| Price (one-time, perpetual) | $49 | $119 |
A modern alternative to legacy Modbus tools.
| Feature | ModbusManager | Modbus Poll | QModMaster |
|---|---|---|---|
| Windows | ✓ | ✓ | ✓ |
| Modbus RTU | ✓ | ✓ | ✓ |
| Modbus TCP | ✓ | ✓ | ✓ |
| TX/RX log | ✓ | ✓ | ✓ |
| Saved profiles | ✓ | ✓ | ✗ |
| Serial Monitor | ✓ | ✓ | ✗ |
| Slave / Address Scan | ✓ | ✓ | ✗ |
| Conditional colors | ✓ | ✓ | ✗ |
| Value scaling & labels | ✓ | ✓ | ✗ |
| 32/64-bit float formats | ✓ | ✓ | ✗ |
| Auto-reconnect | ✓ | ✗ | ✗ |
| Register filter | ✓ | ✗ | ✗ |
| Multilingual UI (11 lang) | ✓ | ✗ | ✗ |
| Workspace save / load | ✓ | ✓ | ✗ |
| Built-in Slave Mode | ✓ included | ⚠ separate app | ✗ |
| Register simulation | ✓ | ✗ | ✗ |
| Dashboard HMI (gauges, trends, runtime) | ✓ Pro | ✗ | ✗ |
| Actively maintained | ✓ 2026 | ✓ 2026 | ⚠ 2022 |
| Price | from $49 one-time | $129 one-time | Free |
One license per machine. No subscriptions, no hidden fees.
The installer is signed, but it is new. Here is what to expect and how to verify it.
On first run Windows may show a blue Defender SmartScreen panel saying it prevented an unrecognized app from starting. This is a reputation check, not a virus warning. SmartScreen counts how many people have downloaded and run a given build; a new release starts that count at zero regardless of who signed it.
Both installers are signed by E-Netter OU through Microsoft Azure Artifact Signing and carry a Microsoft timestamp. You can confirm this before running anything.
Choose your edition, then enter your Machine ID and email.
Secure checkout • Standard — $49 one-time payment • Instant delivery
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