Data Sheet
Copyright © Parallax Inc.  RFID Read/Write Module, Serial & USB (#28440 / 28540)  v2.0 2/22/2018 Page 10 of 10 
Documentation and Example Code 
The following materials are released under the Creative Commons Attribution 3.0 United States license 
(http://creativecommons.org/licenses/by/3.0/us/
), allowing free distribution and reuse  provided that 
proper attribution is given to the original author. The materials are posted on the RFID Read/Write 
Module product pages; search “28440” and “28540” for serial and USB versions, respectively, at 
www.parallax.com: 
  Product Manual (this document) 
  Design Files (schematic, bill of materials, assembly drawing) 
  Serial version: Example code for BASIC Stamp 2 and Arduino 
  USB version: Example Python scripts for PC, Macintosh, and Linux  
Additional Resources 
•  Grand Idea Studio’s 
RFID Read/Write Module
 web page: 
www.grandideastudio.com/portfolio/rfid-read-write-module/
Revision History 
Version 2.0 
•  Added documentation for RFID Read/Write Module, USB (#28540) 
•  Added note to Usage section about command timeout if no tag is detected 
•  Added Documentation and Example Code section 
•  Minor formatting and layout changes 
Version 1.0 
•  Initial release for RFID Read/Write Module, Serial (#28440)  










