## Printer Device Driver

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### Paper Tray IDs

Assign a new unique internal tray ID for each physical tray your printer models support.

The following example shows how to define four tray IDs:

    #define TRAY_ID_SHEET_FEEDER     0
    #define TRAY_ID_ENVELOPE         1
    #define TRAY_ID_AUTO             2  // automatic sheet feeder
    #define TRAY_ID_MANUAL           3  // manual sheet feeder