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  <header class="top"><div class="shell nav"><a class="brand" href="https://masarray.github.io/"><span class="logo">∿</span>MasArray / ARStack</a><nav class="navlinks" aria-label="Product navigation"><a href="#features">Features</a><a href="#evidence">Lab results</a><a href="#downloads">Download</a><a href="https://github.com/masarray/arstack61850">Source ↗</a></nav></div></header>
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    <section class="shell hero"><span class="pill" data-latest-label>M3.H.3 official stable · IEC 61850 engineering lab</span>
      <h1>Your own <em>IEC 61850 Process Bus</em> lab.</h1>
      <p class="lead">Need real IEC 61850 Process Bus packets for a relay, BCU or subscriber test? Use one affordable ESP32-P4 and <strong>ARStack Studio</strong> to inject configurable <strong>4I+4V Sampled Values</strong> alongside <strong>internal lab PTP SOURCE traffic</strong> over Ethernet. Test signals, compare stream settings and troubleshoot on an isolated bench—without a full Merging Unit test rack.</p>
      <div class="actionrow"><a class="btn primary" data-asset="windows" href="https://github.com/masarray/arstack61850/releases/download/processbus-sim-m3h3-20261025/ARStack-Studio-M3H3-win-x64-setup.exe">Download latest Windows Setup ↓</a><a class="btn secondary" href="#downloads">All release assets</a><a class="btn secondary" href="https://github.com/masarray/arstack61850/releases/latest">Read release notes ↗</a></div>
      <div class="meta">Free and open source · Windows Studio + matched ESP32-P4 firmware · <a href="https://github.com/masarray/arstack61850/releases/latest">Latest verified release</a></div>
    </section>
    <div class="shell metrics" id="evidence" aria-label="M3.H.3 independent real-Ethernet SV capture benchmark"><div class="metric"><strong>4,705,090</strong><span>Ethernet SV frames captured</span></div><div class="metric"><strong>3,999.886</strong><span>Actual SV frames per second</span></div><div class="metric"><strong>19m 36s</strong><span>Independent SV wire-capture span</span></div><div class="metric"><strong>0</strong><span>Missing / duplicate / reorder / malformed SV</span></div></div>
    <section class="shell content" id="features"><h2>Real network traffic. Controllable lab scenarios.</h2><p class="sectionintro">A native Windows engineering surface controls an embedded real-time publisher. The sample clock and Ethernet transmission run autonomously on the powered ESP32-P4—not from a Windows application timer. Closing and reopening Studio preserves the board state.</p>
      <div class="cards"><article class="card"><h3>Real SV traffic for relay &amp; BCU labs</h3><p>Generate 4 current + 4 voltage channels, configurable amplitude/phase, one ASDU and nominal 4,000 SV frames/s. Use the Ethernet stream as an engineering test input; match APPID, MAC, VLAN and svID to the subscriber.</p></article><article class="card"><h3>SV + PTP lab simulation</h3><p>Publish real Layer-2 SV together with PTP Announce, Sync and Follow_Up from an internal laboratory SOURCE. Inspect signal timing, sample counters and smpSynch from capture tools.</p></article><article class="card"><h3>Control, capture, reconnect</h3><p>Start from Studio, close it while the powered board keeps publishing, then reopen Studio to adopt the active board state. Tune 4I+4V waveforms and capture the packets you inject.</p></article></div>
      <div class="schematic" aria-label="Process bus simulator topology"><div class="unit">ARStack Studio<small>Windows setup · autonomous board state</small></div><span class="wire" aria-hidden="true"></span><div class="unit">ESP32-P4 Ethernet<small>EMAC hardware timestamp + 4 kHz SV grid</small></div><span class="wire" aria-hidden="true"></span><div class="streams"><div>PTP · Announce / Sync / Follow_Up</div><div>SV · 4I+4V · smpSynch AUTO</div></div></div>
      <p class="small">M3.H.3 on-wire lab capture: <strong>4,705,090 SV frames over 19 min 36 s</strong>, 3,999.886 fps, zero missing/duplicate/reordered/malformed SV; 3,528 PTP packets observed and smpSynch=2 on the received stream. <a href="https://github.com/masarray/arstack61850/blob/main/docs/releases/PROCESSBUS_AUTONOMOUS_M3H3_OFFICIAL_20261025.md">View the engineering capture results</a>.</p>
    </section>
    <section class="shell content" id="roadmap"><h2>Next: multiple virtual Merging Units from one board.</h2><p class="sectionintro">ARStack is built for practical digital-substation engineers. Our next priority is <strong>Multi-SV on one ESP32-P4</strong> plus <strong>SCL-driven Merging Unit simulation</strong>: open an SCD/CID/IID, select supported SV streams and deploy their identities and DataSet layouts without building a rack of physical MUs.</p><div class="cards"><article class="card"><h3>Multiple SV publishers</h3><p>One ESP32-P4, multiple independently configured SV streams, each with its own identity and sample counter.</p></article><article class="card"><h3>SCL file-based configuration</h3><p>Choose Merging Unit streams from IEC 61850 engineering files and map supported DataSet leaves to generated waveforms.</p></article><article class="card"><h3>Engineer-first workflow</h3><p>Open file → select stream(s) → assign values → Start → observe real traffic in a relay/BCU test network.</p></article></div><p class="small">Multi-stream publishing and the full SCL-driven MU workflow are planned next; M3.H.3 currently ships the proven single 4I+4V SV stream. <a href="https://github.com/masarray/arstack61850/blob/main/docs/PROCESS_BUS_MULTI_SV_SCL_NEXT_PHASE.md">See the engineering roadmap</a>.</p></section>
    <section class="shell content" id="studio-preview"><h2>See ARStack Studio in action.</h2><p class="sectionintro">Configure IEC 61850 waveform scenarios, inspect phasors, and prepare process-bus experiments in one native desktop workspace.</p>
      <figure class="studio-preview"><img src="assets/screenshots/arstack-studio-windows.png" alt="ARStack Studio Windows engineering interface with 4I+4V signal controls, voltage and current phasors and waveform preview" width="960" height="680" loading="lazy" decoding="async"><figcaption>Real Windows Qt application screenshot · 960 × 680</figcaption></figure>
    </section>
    <section class="shell content" id="getting-started"><h2>First packet in four steps.</h2><div class="setup"><div class="step"><b>Install Studio</b>Use Windows Setup or Portable; both include the matched firmware and flashing tool.</div><div class="step"><b>Flash ESP32-P4</b>Connect USB OTG and install the matching firmware from the release.</div><div class="step"><b>Select lab timing</b>Use PTP SOURCE / INTERNAL_GM_ONLY and smpSynch AUTO on an isolated Ethernet LAN.</div><div class="step"><b>Start and capture</b>Run 4I+4V, then inspect SV 0x88BA and PTP 0x88F7 in ARSAS, DigSubAnalyzer or Wireshark.</div></div><p class="footnote">Safety boundary: Never attach the lab PTP GM or SV publisher to a live substation process bus. Use an isolated test LAN or VLAN. ARStack is an <strong>open-source IEC 61850 engineering lab tool</strong>; no external GPS or protection relay is needed for the basic simulation.</p></section>
    <section class="shell content" id="downloads"><h2>Download the latest release.</h2><p class="sectionintro">Choose the installer, portable application or matched board firmware from the latest stable GitHub release. Downloads update automatically when a new verified release is published.</p>
      <div class="downloads"><article class="download"><div><h3>Windows Installer</h3><p>Windows x64 · setup and bundled dependencies</p></div><a data-asset="windows" href="https://github.com/masarray/arstack61850/releases/download/processbus-sim-m3h3-20261025/ARStack-Studio-M3H3-win-x64-setup.exe">Setup EXE ↗</a></article>
        <article class="download"><div><h3>Portable ZIP</h3><p>Windows x64 · run without a separate installation</p></div><a data-asset="portable" href="https://github.com/masarray/arstack61850/releases/download/processbus-sim-m3h3-20261025/ARStack-Studio-M3H3-win-x64-portable.zip">Portable ZIP ↗</a></article>
        <article class="download"><div><h3>ESP32-P4 Firmware</h3><p>Match the firmware to your installed Studio release</p></div><a data-asset="firmware" href="https://github.com/masarray/arstack61850/releases/download/processbus-sim-m3h3-20261025/ARStack-ESP32P4-M3H3-firmware.bin">Firmware BIN ↗</a></article>
        <article class="download" id="linux-download"><div><h3>Linux AppImage</h3><p>Linux x86_64 · single-file desktop app</p></div><a data-asset="linux" href="https://github.com/masarray/arstack61850/releases/download/processbus-sim-m3h3-20261025/ARStack-Studio-linux-x86_64.AppImage">AppImage ↗</a></article></div>
      <p class="small">Build-specific checksums and metadata are provided on the release page: <a href="https://github.com/masarray/arstack61850/releases/latest">SHA256SUMS.txt</a> · <a href="https://github.com/masarray/arstack61850/releases/latest">firmware-manifest.json</a> · <a href="https://github.com/masarray/arstack61850/blob/main/docs/releases/PROCESSBUS_AUTONOMOUS_M3H3_OFFICIAL_20261025.md">M3.H.3 measured benchmark</a>.</p></section>
  </main>
  <footer class="footer"><div class="shell"><span>© 2026 MasArray · Open-source IEC 61850 engineering experiments</span><span><a href="https://masarray.github.io/">MasArray Portal</a> · <a href="https://github.com/masarray/arstack61850">GitHub source</a> · <a href="https://github.com/masarray/arstack61850/releases/latest">Latest release</a> · <a href="https://github.com/masarray/arstack61850/blob/main/docs/community/README.md">Community experiments ↗</a></span></div></footer>

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