OLIMEX MOD-RFID125, User Manual

Linux distributions normally include drivers both for USB HID and USB 
CDC classes. Depending on which driver is loaded in the kernel, user 
should look either for 

 /dev/ttyACMn 
or 
 /dev/ttyUSBn 

where "n" is a number, assigned by the kernel to the plugged device. 
 

 
USB HID MODE: 

When device is connected via USB to a host PC it will represent itself as 

USB HID keyboard. When an RFID transponder is detected in the vicinity, 
the module will type the HEX-representation of the transponder ID.  
 

To use the device in this mode: 

1.

Open Notepad. 

2.

Plug in the device in the USB port of the PC. 

3.

Put an RFID tag in front of the device. The TAG ID will be entered in 
the currently opened text file. 

There is no need for OS driver because all major operating systems include 
USB HID drivers. 

NOTE: 

This mode does not allow configuration of device parameters. MOD-

RFID125 is shipped with default configuration for continuous read and one 
second repeat. If this must be changed then device must be switched to 

USB CDC mode and configured using the serial command line interface. 

 
USB CDC MODE: 

In this mode the device represents itself as USB CDC virtual serial port. It 
provides a simple shell-like command line interface for configuring and 
interacting with the module. The device echoes back the typed characters 

and waits for Carriage Return (Enter) before processing the line input. See 
“Command Line Interface” for more information on the supported 

commands. 
 
Any terminal software can be used to open the COM port, assigned by the 

OS, and type in commands.