User's Manual

Table Of Contents

RFI341 Radio Frequency Interrogator

3.2 Functional Description of the device

The device operates according the reader/interrogator “talks first” (ITF)

method as defined in the ISO/IEC 15693 Standard. Each transponder in

the field remains silent until a request is received. The interrogator can

identify simultaneously a number of tags present in the antenna field. The

interrogator can write data to and read data from the transponders.

Transponders can be addressed by e.g. using the factory programmed,

unique read only number (64 bit length). If the data in the user memory of

the tag are not write protected, the read/write feature enables the

rewriting of the data stored in this memory.

The RFI341 is controlled by the data interface. The commands are

described in the document “Telegram Listing RFI341” which enables the

use of the features defined in ISO/IEC 15693. Additional commands

support the use of sensor inputs and/or actuators. After configuration the

device could either work in a mode where the host in controlling the unit

or in trigger mode. Configuration in trigger mode means: The device is

waiting for a start condition to start reading automatically. Reading results

will be transmitted directly or with closing the read window. If the device

is running in background mode only a valid escape sequence will

terminate this and brings the device back in command mode (see also

telegram listing).

To start a reading process, when an object with a transponder is in the

field, the RFI341 must be clocked by one of the following:

• A command sequence via the data interface

• The execution (based on a suitable trigger) of a previously

defined background command

If a transponder is detected, the relevant data can be send via the data

interface to the host. The “Data LED” indicates the presence of tag data.

Product Description