(m_portsInfo[0].m_universeData[i]);
+
+ if (newVal == oldVal)
+ continue;
+
+ if (!cmdSetChannelValue(i, newVal))
+ {
+ result = false;
+ continue;
+ }
+
+ oldVal = newVal;
+ }
+
+ return result;
+}
+
+/*************************************************************************
+ * Info
+ *************************************************************************/
+
+QString UsbdmxLegacy::additionalInfo() const
+{
+ QString info;
+ info += QString("");
+ info += QString("%1: usbdmx.com (legacy) (%3)").arg(QObject::tr("Protocol"))
+ .arg(QObject::tr("Output"));
+ info += QString("
");
+ info += QString("%1: %2").arg(QObject::tr("Serial number"))
+ .arg(serial());
+ info += QString("
");
+ return info;
+}
+
+/*************************************************************************
+ * Command helpers
+ *************************************************************************/
+
+bool UsbdmxLegacy::cmdTxOn()
+{
+ QByteArray msg;
+ msg.append(char(USBDMXLEGACY_CMD_TX_ON));
+ return iface()->write(msg);
+}
+
+bool UsbdmxLegacy::cmdTxOff()
+{
+ QByteArray msg;
+ msg.append(char(USBDMXLEGACY_CMD_TX_OFF));
+ return iface()->write(msg);
+}
+
+bool UsbdmxLegacy::cmdSetLastChannel(int lastIndex)
+{
+ if (lastIndex < 0)
+ lastIndex = 0;
+
+ if (lastIndex > 511)
+ lastIndex = 511;
+
+ QByteArray msg;
+ msg.append(char(hiBit(lastIndex) ? USBDMXLEGACY_CMD_SET_LAST_TX_HIGH_ADDRESS_BIT : USBDMXLEGACY_CMD_SET_LAST_TX));
+ msg.append(char(lo(lastIndex)));
+ return iface()->write(msg);
+}
+
+bool UsbdmxLegacy::cmdSetChannelValue(int index, uchar value)
+{
+ if (index < 0 || index > 511)
+ return false;
+
+ QByteArray msg;
+ msg.append(char(hiBit(index) ? USBDMXLEGACY_CMD_SET_VALUE_HIGH_ADDRESS_BIT : USBDMXLEGACY_CMD_SET_VALUE));
+ msg.append(char(lo(index)));
+ msg.append(char(value));
+ return iface()->write(msg);
+}
diff --git a/plugins/dmxusb/src/usbdmxlegacy.h b/plugins/dmxusb/src/usbdmxlegacy.h
new file mode 100644
index 0000000000..cdaaec3bca
--- /dev/null
+++ b/plugins/dmxusb/src/usbdmxlegacy.h
@@ -0,0 +1,73 @@
+/*
+ Q Light Controller Plus
+ usbdmxlegacy.h
+
+ Adds support for the "USB/DMX Interface" (usbdmx.com) custom protocol
+ as documented in "USB/DMX Interface - Command Specification (V 1.4)".
+
+ Copyright (C) 2025
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0.txt
+*/
+
+#ifndef USBDMXLEGACY_H
+#define USBDMXLEGACY_H
+
+#include "dmxusbwidget.h"
+
+/**
+ * Implements the usbdmx.com interface protocol (Ben Suffolk, v1.4 PDF).
+ * The device is FTDI-based and maintains its own DMX timing once TX is ON.
+ * We only push per-channel updates and set the "last TX channel" bound.
+ */
+class UsbdmxLegacy : public QThread, public DMXUSBWidget
+{
+ Q_OBJECT
+
+ /************************************************************************
+ * Initialization
+ ************************************************************************/
+public:
+ UsbdmxLegacy(DMXInterface *iface, quint32 outputLine);
+ virtual ~UsbdmxLegacy();
+
+ /** @reimp */
+ DMXUSBWidget::Type type() const override;
+
+ /*************************************************************************
+ * Open & Close
+ *************************************************************************/
+ /** @reimp */
+ bool open(quint32 line = 0, bool input = false) override;
+
+ /** @reimp */
+ bool close(quint32 line = 0, bool input = false) override;
+
+ /*************************************************************************
+ * Outputs
+ *************************************************************************/
+ /** @reimp */
+ bool writeUniverse(quint32 universe, quint32 output, const QByteArray& data, bool dataChanged) override;
+
+ /*************************************************************************
+ * Info
+ *************************************************************************/
+ /** @reimp */
+ QString additionalInfo() const override;
+
+private:
+ // usbdmx.com command helpers
+ bool cmdTxOn();
+ bool cmdTxOff();
+ bool cmdSetLastChannel(int lastIndex); // argument in [0..511]
+ bool cmdSetChannelValue(int index, uchar value); // index in [0..511]
+
+ inline uchar lo(int index) const { return static_cast(index & 0xFF); }
+ inline bool hiBit(int index) const { return (index & 0x100) != 0; }
+};
+
+#endif // USBDMXLEGACY_H