Does it support event buffering and class polling?

Yes. Class 0 integrity polls and class 1, 2, and 3 event scans are supported. The outstation simulator buffers events with timestamps and sequence numbers.

Part of: Field tools

DNP3 master and outstation on your Mac.
Native on Mac. No Parallels.

DNP3 master polling and outstation simulation in one native app: binary and analog I/O, counters, class 0/1/2/3 polling, event buffering and time sync. No VM.

Buy Direct · $29.99 See what it does

$29.99

One-Time

DNP3

IEEE 1815

5 types

BI / BO / AI / AO / CI

Class 0–3

Event Polling

DNP3 Explorer screenshot: a point list polled from a DNP3 outstation showing group, variation, index and live values. — A point list polled from a DNP3 outstation showing group, variation, index and live values.

DNP3 Explorer screenshot: the trend chart plotting three current points over time next to the point table. — The trend chart plotting three current points over time next to the point table.

DNP3 Explorer screenshot: class 1, 2 and 3 event scans in the communication log, with class polling and device control buttons. — Class 1, 2 and 3 event scans in the communication log, with class polling and device control buttons.

Demo video

Watch the demo

A tour of DNP3 Explorer for Mac: live points, control operations, class event scans, a built-in outstation and trends.

Chapters

Watch on YouTube

Features

Master and outstation in one app.

Master polling, outstation simulation, the common point types, class polling, event buffering, time sync, controls and a communication log.

DNP3 Master Mode

Connect to any DNP3 outstation over TCP. Configure master address and outstation address. Poll at custom intervals. Read binary inputs, binary output status, analog inputs, analog output status, and counters.

DNP3 Outstation Simulation

Simulate a DNP3 outstation to test your master/RTU/SCADA system without physical hardware. Set the number of binary, analog and counter points, or load a device template with live simulated values. Responds to integrity polls and event scans, and accepts controls as direct operate or select before operate.

Binary Input / Output

Monitor binary inputs and binary output status points. Operate binary outputs with control relay output blocks (latch on, latch off, pulse on, pulse off), as direct operate or select before operate.

Analog Input / Output

Read analog inputs (32-bit integer and float32) and analog output status, and send float32 analog output setpoints as direct operate or select before operate. Monitor voltages, currents, pressures, temperatures, and other process values with live value updates.

Counter Inputs

Read 32-bit counter points and send a freeze command to all counters from the master. Monitor pulse accumulators, energy totals, and flow totals.

Class 0/1/2/3 Polling

Integrity poll (class 0) for a complete point scan. Event scans for class 1, 2 and 3 events. In the outstation simulator, analog changes are buffered as class 1 events, counters as class 2 and binary changes as class 3.

Event Buffering

Outstation mode buffers value changes as events with a timestamp, a sequence number and a class. Test your SCADA's event processing without physical RTUs.

Time Synchronization

Send a DNP3 time sync to an outstation. Perform cold restart and warm restart operations. Verify your RTU's clock and restart behavior from your MacBook.

Communication Log & Export

Every request the app sends and every response it receives is written to a timestamped log marked TX or RX. Export the log to CSV to debug communication problems.

Screenshots

See it in action

DNP3 Explorer screenshot: a write dialog for sending a control value to a binary output point. — A write dialog for sending a control value to a binary output point.

DNP3 Explorer screenshot: a built-in DNP3 outstation with a simulated point table and an event buffer. — A built-in DNP3 outstation with a simulated point table and an event buffer.

Part of: Field tools · Debug one device from your laptop: protocol apps, terminal database browsers, utilities.

How MacTools DNP3 Explorer differs from…

Voltrus SCADA
This app is for commissioning and debugging one device from your laptop. Voltrus SCADA watches many devices around the clock, with dashboards, alarms and history on your own hardware.
Voltrus Gateway
Voltrus Gateway has no screens to click through: it is a self-hosted service that exposes Modbus, OPC UA, EtherNet/IP, S7, DNP3, BACnet/IP and MQTT to your own software over one gRPC API.
MacTools suite
Working with more than one protocol? MacTools has one native app per protocol, each sold on its own: 4 paid apps from $24.99 one-time, and free downloads with an optional one-time Pro licence.

Next step

Not sure? See which one you need →

FAQ

Common questions

Does this work on Apple Silicon (M1/M2/M3/M4)? +

Yes. MacTools DNP3 Explorer is a native app built with Rust and Tauri. It runs natively on both Apple Silicon and Intel Macs. No Rosetta, no virtual machines needed.

Do I need Parallels or Wine to run this? +

No. This is a native macOS app. No Windows, no Parallels, no Wine, no Node.js, no Python. Install and it just works.

Does it support both DNP3 master and outstation modes? +

Yes. Master mode connects to outstations for polling binary inputs, analog inputs, counters, and more. Outstation mode simulates a DNP3 device with a configurable number of points (or a device template) and event generation, all in one app.

What point types does DNP3 Explorer support? +

Binary inputs and binary output status, analog inputs (32-bit integer and float32), analog output status, and 32-bit counters. Controls go to binary outputs (control relay output blocks) and analog outputs (float32).

Is this a subscription? +

No. It is a one-time purchase of $29.99. No recurring fees, no in-app subscriptions, no "Pro" tier unlock. You get everything for one price.

What is class 0/1/2/3 polling? +

DNP3 organizes events into classes. Class 0 is an integrity poll that reads all points. Classes 1, 2, and 3 are event scans for time-critical, medium-priority, and low-priority events respectively. DNP3 Explorer supports all four class polls.

Does it support event buffering? +

Yes. The outstation simulator buffers events when point values change. Each event carries its class, a timestamp and a sequence number. Test your SCADA's event processing without physical RTUs.

Can I perform time synchronization? +

Yes. The master mode supports DNP3 time synchronization commands to outstations. You can also issue cold restart and warm restart commands to reset outstation behavior and verify proper startup sequences.

Is it compliant with IEEE 1815? +

DNP3 Explorer implements the core DNP3 protocol as defined by IEEE 1815. It supports standard data objects, function codes, link layer framing, and application layer sequencing for interoperability with compliant devices.

What are counter inputs? +

Counter inputs are DNP3 data objects that accumulate pulses, used for energy totals, flow totals, and other accumulations. DNP3 Explorer reads 32-bit counters and can send a freeze command to all counters from the master.

What are cold restart and warm restart? +

Cold restart tells the outstation to perform a full power-cycle reset, clearing all configuration and buffers. Warm restart tells the outstation to restart its DNP3 communication stack without clearing configuration. Both are supported in master mode for testing RTU restart behavior.

Licensing

Need classroom, laboratory, or organization-wide licensing?

Voltrus offers Team, Academic Lab, and Enterprise Site licenses: one invoice, multi-seat usage, offline native apps. Tiers and prices are on the licensing page.

See Academic & Enterprise Options

Buy

Stop paying for Parallels.
Master and outstation in one native app.

$29.99

One-time purchase, no subscription, no hidden fees

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Stay Updated

Get notified about new features & updates

We add new point types, protocol features, and platform support regularly. No spam, only product updates.

From one device to the whole line

Monitoring this PLC 24/7?

DNP3 Explorer is built for commissioning and debugging. For round-the-clock monitoring use Voltrus OEE (hosted, live availability and downtime per machine) or Voltrus SCADA (dashboards, alarms and history on your own hardware).

Voltrus OEE → Voltrus SCADA →

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