OLIMEX MOD-RFID125 User Manual

MOD-RFID125

User Manual

All boards produced by Olimex are ROHS compliant

Rev.A, February 2008

Copyright(c) 2008, OLIMEX Ltd, All rights reserved

INTRODUCTION:

MOD-RFID125 is an RFID station, able to read Manchester-encoded 64-bit
EM4102 tags with 64 periods of carrier frequency per data bit. All the
complexity of RFID tag detection, verification and decoding are handled by
MOD-RFID125. After it strips the header and the checksums user is given
the 40-bit ID of the transponder tag.

MOD-RFID125 supports three distinctive modes of operation, easily
switched by a single button press. It can emulate USB HID keyboard and
input the read TAG ID directly to any Windows application, including the
venerable Notepad. Or it can emulate USB CDC serial port for easy access
from custom user applications using standard code for COM port access.
The third option allows access from any standard 5V UART, allowing easy
integration with existing microcontroller applications.

FEATURES:

- Supports Manchester-encoded 64-bit EM4102 RFID tags with 64

periods of carrier frequency per data bit;

- Base RFID frequency 125kHz;

- USB port connection to PC;

- Standard 5V UART 9600,8N1 connection to user microcontroller

boards;

- Three modes of operation, easily changed by pressing the button;

- USB HID keyboard emulation mode;

- USB CDC serial port emulation mode;

- UART connection mode;

- Simple command-line interface in USB CDC and UART modes for

configuration and data acquisition;

- Two LEDs indicating device status and tag presence;

- Support for continuous and periodic RF scanning to better suit user

power requirements;

- Ships with default mode USB HID and default configuration:

continuous read, scan always, one report per second, LEDs activated;

ELECTROSTATIC WARNING:

The MOD-RFID125 board is shipped in protective anti-static packaging.
The board must not be subject to high electrostatic potentials. General
practice for working with static sensitive devices should be applied when
working with this board.

REQUIREMENTS:

Cables: 1.8 meter USB A-B cable.

Power: External 6-9V DC power supply (applicable only for MOD-RFID125-

BOX in UART mode).

Software:

Software needed for USB HID keyboard mode:

- Notepad or other text editor.

Software needed for USB CDC and UART modes:

- HyperTerminal or other terminal program.

SUPPORTED RFID TAGS:

MOD-RFID125 supports RFID transponder tags with the following
characteristics:

- Based on EM4102 chip;

- 125kHZ carrier frequency;

- 64-bit ROM, continuously transmitted;

- 64 periods of carrier frequency per data bit;

- Manchester encoding;

UEXT CONNECTOR SCHEMATICS (only for MOD-RFID125-BOX):

POWER SUPPLY:

Normally the device is supplied from USB.

MOD-RFID125-BOX can be connected to external 6-9V DC power supply.
This can relief the USB hub power supply when device is in USB HID or
USB CDC mode. External power supply is mandatory for UART mode of
operation.

POWER SUPPLY CABLE CONNECTION

Pin

Connect to...

1 +6-9V DC

2 GND

UEXT

pin Abbrev. description

1 NC Not Connected
2 GND Ground
3 RXD UART Receive Data (MOD-RFID125

input)

4 TXD UART Transmit Data (MOD-RFID125

output)
5 NC Not Connected
6 NC Not Connected
7 NC Not Connected
8 NC Not Connected
9 NC Not Connected
10 NC Not Connected