Parallax RFID Card Reader – Serial (28140)

Parallax RFID Card Reader – Serial (28140)

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RFID Card Reader Overview:

The RFID Card Reader can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, robotics, navigation, inventory tracking, payment systems, and car immobilization.

There are a variety of RF transponder tags that come in different packages. Each tag has a specific range that is within 10% of the given distance for each type of tag. The reason for the 10% is due to environmental conditions and RFID modules.

RFID Module & Tag Compatibility Chart available on the Parallax website.

Key Features:
  • Low-cost method for reading passive RFID EM4100 family transponder tags
  • 2400 baud serial interface
  • Enable input allows module to be enabled/disabled by software
  • Bi-color LED for visual indication of status
Application Ideas:
  • Robotics
  • Payment Systems
  • Automatic Identification

Note: This device can be connected to a PC serial port using a MAX232 line driver. The circuit isn’t supported by Parallax, but it’s possible to make this connection with a few dollars of parts or by using the USB version of the reader (Part #28340). There is an outline of connections on the Parallax forums.

RFID Card Reader Details:
  • Reads 125 kHz Tags, EM4100 Family
  • Power requirements: 4.5 to 5.5 VDC
  • Communication: Serial at 2400 baud (8N1)
  • Dimensions: 2.45 x 6.25 x 0.22 in (62.2 x 82.5 x 5.57 mm)
  • Operating temp range: -40 to +185 °F (-40 to +85 °C)
Compatible tags:
  • 54x85mm Rectangle Tag ISO Card: 6.3cm (2.5″) +/- 10% (Part #28141)
  • 50mm Round Tag World Tag 50mm: 6.8cm (2.7″) +/- 10% (Part #28142)
  • Blue Eye Key Fob (Part #28161)
  • 25mm Disk Tag (Part #32397)