OLIMEX MOD-RFID125, User Manual

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: