User Manual

Mini-RFM - Reference Guide November ’00

1.1 General

This manual provides information about the TIRIS Mini-Radio Frequency Module RI-

RFM-003B. It describes the module and how to integrate it into your RFID system.

This guide should be used in conjunction with the RFM Sequence Control Reference

Manual (document number 11-06-21-049) which describes the timing and sequence

of radio communications between the TIRIS transponder and the radio frequency

module.

1.2 System Overview

The three major parts of a TIRIS system are the transponder, antenna and reader.

When a transponder is to be read, the reader sends out a 134.2 kHz power pulse

lasting approximately 50 ms to the antenna. The field generated by this power pulse

is “collected” by the antenna in the transponder that is tuned to the same frequency.

This received energy is stored in a small capacitor within the transponder. When the

power pulse has finished, the transponder immediately transmits its data back to the

reader, using the energy stored within its capacitor as the power source.

1.3 Product Description

The Mini-Radio Frequency Module is an integral part of a TIRIS system, together

with a control module or unit and an antenna it is used for wireless identification of

TIRIS transponders.

Main tasks of the RF module are to send an energizing signal via the antenna to ini-

tialize a TIRIS transponder, to demodulate the received transponder identification

signal and to write to a transponder. The RF module delivers a digital data stream

and a clock signal for further processing to its control unit or module. Furthermore a

field strength dependent digital output is available for synchronization purposes.

Figure 1: The RI-RFM-003B