User Manual

1 - 2 MR400 RFID Reader Module, Integration Guide
Theory of Operation
The MR400 is a UHF (860MHz - 928MHz) RFID reader module. The MR400 RFID Reader Module is used to
read and write UHF passive RFID tags complying to EPCglobal Gen2 standard. Communication between a
reader and a tag occurs in a half-duplex reader-talks-first manner. Commands from the reader is sent to the
tags on the forward link modulated on the transmit carrier followed by a CW transmission. The tags are
powered by the energy by the reader EM field, this wakes up the tags and they are now ready to receive reader
commands. After decoding the command data, the tags response by back scattering with encoded data,
modulated on the CW transmission.
The MR400 is designed as an embedded module and will be used as an integral part of a RFID system.
Typical system included but not limited to the followings:
• Forklift systems
• Handheld or portable devices
• Tag Decode and Encode Printers
• Remote Read Points
Block Diagram
the MR400 consists of a single port transceiver with option for dual diversity antennas, a controller and a
baseband processor with interfaces to external antenna(s) and a host system. Depending on a specific
application, the host could be a single board or a computer system.
Figure 1-2 MR400 RFID Reader Module Block Diagram
Controller
The main functions of the Controller are to communicate with the host, issue protocol commands to the
Baseband Processor to address a population of RFID tags for read and write. In turn, the Baseband Processor
configures the Transceiver frequency and power during the interrogation process. The MR400 is designed to
access tags upon command received from host. To conserve power for battery operated applications, the
Controller also perform power management of the entire reader.
Host
Controller
Baseband
Processor
Transceiver
MR400
Antenna(s)
+5Vdc
Serial
GPIO