How Rf Identification Works - Identipet MPR HS 5900L F Manual

Mini Portable Reader User Manual 3
1.General Information (continued)

1.2 How RF Identification Works

The Mini Portable Reader generates an electromagnetic field which is used to
energize a small, glass-enclosed chip programmed with a unique ID code. The
electromagnetic field provides energy needed by the chip to transmit its ID code
back to the reader for display, storage, or transfer to another device such as a
computer or printer.
The Mini Portable Reader antenna contains two coils: 1) an exciter coil through
which current is driven to create an electromagnetic field, and 2) a return-signal
receiving coil. The electromagnetic field energizes passive RF transponders (tags)
within the read range. The transponder sends the tag ID code back to the
receiving coil via a signal modulated between 12.5 and 15.625 kHz. The Mini
Portable Reader electronics then amplify the tag ID code, converts it to digital form,
decodes it and displays it on the LCD. The exciter operates at a frequency of
125kHz.
Figure 2: System Configuration