Micro RWD QT (Quad Tag)

(click on picture to enlarge)

Micro RWD Quad Tag module description

Low-cost proximity RFID reader module supporting several transponder/tag types. Philips / NXP Hitag 1, Hitag S, Hitag 2, EM4001 / EM4102 and Microchip MCRF200/123 tag types.

The module is completely housed within a 24-pin DIP package (pin compatible with other modules) and only requires a 5v supply and a 700 micro-Henry antenna coil to be a fully featured read/write and tag acceptance system.

The RWD module has outstanding RF drive capability and has a read/write range to ISO card size tags of up to 20cm whilst maintaining reliable communication and high resilience to EMC corruption. This has been achieved through the RWD continuously self-tuning to allow for inductive changes in the RF field and extensive software/hardware filtering.

Pinout diagram

The RWD module has a TTL level RS232 interface that allows a host system to send and receive easy-to-use optimised commands/data (for example: ASCII “R” command to read tag data and ASCII “W” command to write tag data).

The RWD also has internal EEPROM memory for holding system parameters, encryption/password keys, lists of authorised serial numbers and supports direct LED drives to give visual indication of acceptance. Up to 100mA of drive current is also provided on several outputs that can be used to switch external loads.

Individual tag modes of RWD QT module operate in same manner as RWD HITAG 1/S, RWD HITAG 2, and RWD EM4102 modules.

Download: Micro RWD QT data sheet

For battery and power-sensitive applications, the new RWD-QT-LP (low power) version is now available. This retains all the key features of the existing RWD-QT (Quad Tag) RFID Read/Writer module but has very low average operating current.

The RWD-QT-LP employs dynamic "sleep" techniques and with the programmable polling delay, can achieve average current consumption of less than 150uA (micro Amps) even when fully active and scanning for tags.

We can customise RWD interface and features for your application, contact us for more information.

Basic electrical specification

(without LEDs fitted and no auxiliary output drive).

Supported Transponders

EM4102 tag has 8 bytes of read only memory (factory programmed)
of which 5 bytes are available to user.

Hitag S tag has up to 2048 bits (256 byte) read/write memory of which up to 248 bytes are available for user data storage. The first four bytes of memory contain a factory set 32 bit (4 byte) unique serial number.

Hitag 2 tag has a 256 bit (32 byte) read/write memory of which up to 16 bytes are available user data storage. The first four bytes of memory contain a factory set 32 bit (4 byte) unique serial number.