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NFC Reader physical specification
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‎docs_src/physical_spec.md‎

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# Physical specification
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This document describes the requirements imposed by the OpenPrintTag standard on the physical tag itself, its mechanical and electrical properties. Currently, the **OpenPrintTag standard supports only the reference `OpenPrintTag MK1` tag**. A more generic specification, allowing deviations from the exact reference design and including NFC reader parameters, **will be released later**.
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This document describes the requirements imposed by the OpenPrintTag standard on the physical tag itself, its mechanical and electrical properties. Currently, the **OpenPrintTag standard supports only the reference `OpenPrintTag MK1` tag**. A more generic specification, allowing deviations from the exact reference design, **will be released later**.
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## Reader specification
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To comply with the OpenPrintTag standard, a NFC reader SHALL meet the following parameters. Meeting the parameters is necessary to ensure readability for various tag attachment positions and spool sizes supported by the standard.
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<table>
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<tr>
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<th>Parameter</th>
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<th>Min</th>
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<th>Typical</th>
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<th>Max</th>
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<th>Unit</th>
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</tr>
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<tr>
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<tr>
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<td>Communication protocol</td>
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<td colspan="4">ISO/IEC 15693-3 (NFC-V)</td>
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</tr>
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<tr>
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<td>Antenna shape</td>
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<td colspan="4">Circular</td>
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</tr>
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<tr>
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<td>Antenna diameter (Ø)</td>
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<td align="right">72</td>
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<td align="right">75</td>
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<td align="right">80</td>
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<td>mm</td>
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</tr>
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<tr>
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<td>RF output power</td>
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<td align="right"></td>
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<td align="right">1</td>
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<td align="right">1.6</td>
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<td>W</td>
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</tr>
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<tr>
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<td>Resonant frequency</td>
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<td align="right">13.553</td>
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<td align="right">13.56</td>
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<td align="right">13.567</td>
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<td>MHz</td>
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</tr>
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</table>
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1. The reader antenna SHALL be installed to be parallel with the side of the mounted spool.
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1. The reader antenna SHALL be installed to be concentric with the mounted spool with maximum 5 cm of allowed eccentricity.
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1. _Note: If the spools are mounted using a pole going through the spool center hole, there will be eccentricity introduced by the difference of the rod and the spool hole diameters._
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1. _Note: If the spools are laid on rollers, there will be eccentricity introduced by different outer diameters of the spools._
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1. The reader antenna SHOULD be installed to be as close to the filament spool as possible.
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1. The reader antenna SHOULD be installed in a sufficient distance from components (such as large metal parts or NFC tags not intended to be read by the reader) that can drain energy from the magnetic field.
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1. _Note: This needs to be experimentally verified for every installation scenario._
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<img src="media/antenna_placement.svg" style="max-width: 512px;">
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## Reference `OpenPrintTag MK1` tag
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`OpenPrintTag MK1` is a passive paper-label NFC tag with an embedded antenna and NFC integrated circuit, compliant with the ISO/IEC 15693 vicinity-RFID standard (13.56 MHz).

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