User's Manual

Transponder PT21
Specifications A-1
Appendix A
Specifications
This appendix gives technical specifications for the Transponder PT21, the Reader RD21, the
Exciter EX21, and the AC Source TRM95. It also gives information on system performances and
special features.
Transponder PT21
LF Receiver • Configuration: Direct detection for 125.0 kHz signals modulated On/Off (OOK) with 610 Hz.
• Minimum LF excitation duration: 150 ms.
• Carrier Frequency (125.0 kHz) Bandwidth @3dB:12 to 18 kHz.
• Sensitivity: better than H = 10mA/m[80 dBµA/m] for optimum excitation.
UHF Transmitter • Carrier Frequency, nominal: 433.92 MHz ±50 kHz, stabilized by a SAW resonator.
• Carrier Frequency, max. variation: ±100 kHz,due to temperature and aging
• Modulation Type: Frequency-Shift Keying (FSK).
• Total Frequency Deviation, nominal: 15 ±3 kHz.
• Total Frequency Deviation, max. variation: 8 to 40 kHz.
• Radiated Power (ERP): less than 10 µW.
• Data Rate: 19.2 or 38.4 kbps.
Excitation Signal The Transponder is only awaken by signals accepted by the LF Receiver that have a duration of at
least 150ms with a determined pattern of modulation.
Programming • Mode: LF field.
• Data Rate: 1.2 kbps.
• Parameters: see the RFID System S21 Reference Guide.
Writing and
Transmitting Data
Asynchronous, NRZ, using a specially developed protocol.
Message Format For more information, see Appendix B, Transponder PT21 Messages.
Power Supply 3 V/150 mAh, lithium cell battery.
Power
Consumption
Maximum 3 µA in sleep mode; 2.5mA in transmission mode.