Checkpoint Systems Inc. GPRO7000 Manual De Usuario
TR4090 USER’S GUIDE
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CHECKPOINT SYSTEMS, INC. CONFIDENTIAL AND PROPRIETARY INFORMATION, FOR INTERNAL USE ONLY.
Dwg. No. 265245
Rev. 00
Page 3
1.0
OVERVIEW
The TR4090’s function is to “read” MCRF355 passive read-only RFID tags. The MCRF355
provides 154 bits of non-volatile user memory. When the MCRF355 enters the RF field of the
TR4090, it is in a tuned state. The tuned circuit of the tag resonates with the continuous RF field
of the TR4090 antenna and therefore gathers energy. The tag stores enough energy to keep the
tag circuit powered long enough to transmit its 154 bits of data. The tag’s data is transmitted in
Manchester format at a nominal frequency of 70kHz +/- 12kHz.
provides 154 bits of non-volatile user memory. When the MCRF355 enters the RF field of the
TR4090, it is in a tuned state. The tuned circuit of the tag resonates with the continuous RF field
of the TR4090 antenna and therefore gathers energy. The tag stores enough energy to keep the
tag circuit powered long enough to transmit its 154 bits of data. The tag’s data is transmitted in
Manchester format at a nominal frequency of 70kHz +/- 12kHz.
The tag transmits its data by tuning and detuning its resonant circuit. When the RF tag is tuned, it
loads (takes energy from) the reader field. The loading of the reader field shows up as small
amplitude perturbations of the RF reader’s field (back scatter). These perturbations are at 70kHz
and so are easily filtered out of the 13.56MHz carrier of the field. The 70kHz base band data is
amplified for further processing. The raw Manchester data is decoded by the TR4090’s
microcontroller and sent out over its RS-232 or RS-485 serial port.
loads (takes energy from) the reader field. The loading of the reader field shows up as small
amplitude perturbations of the RF reader’s field (back scatter). These perturbations are at 70kHz
and so are easily filtered out of the 13.56MHz carrier of the field. The 70kHz base band data is
amplified for further processing. The raw Manchester data is decoded by the TR4090’s
microcontroller and sent out over its RS-232 or RS-485 serial port.
The TR4090 connects to a Personal Computer (HOST PC) via its RS-232 or RS-485 serial port.
The signal type must be factory set; i.e., the factory default setting is RS-232 but can be changed
to RS-485 by appropriate jumper settings. When RFID tag data is received, the data is sent to the
HOST PC according to the formats discussed in the next section.
The signal type must be factory set; i.e., the factory default setting is RS-232 but can be changed
to RS-485 by appropriate jumper settings. When RFID tag data is received, the data is sent to the
HOST PC according to the formats discussed in the next section.
In addition to receiving data from the TR4090 via its serial port, the HOST PC can send
commands to the TR4090 in order to configure it.
commands to the TR4090 in order to configure it.
Commands from the HOST PC must always be sent at 9600 baud in order to avoid conflicts. The
TR4090 can be commanded by the HOST PC to transmit data at one of four baud rates (these
commands are explained in section 3.0).
TR4090 can be commanded by the HOST PC to transmit data at one of four baud rates (these
commands are explained in section 3.0).
2.0
INSTALLING THE TR4090
2.1 Equipment List