28140 Parallax Inc, 28140 Datasheet - Page 4

• Manufacturer Part Number: 28140
• Description: READER MODULE RFID
• Manufacturer: Parallax Inc

Specifications of 28140

• Rf Type: Read Only
• Frequency: 125kHz
• Features: Single 5V Power Supply
• Package / Case: Module
• Product: Microcontroller Accessories
• Data Bus Width: 8 bit
• Clock Speed: 125 KHz
• Interface Type: USB
• Operating Supply Voltage: 5.5 V
• Board Size: 46.99 mm x 69.22 mm x 21.84 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Connecting and Testing (USB Version)
The Parallax RFID Card Reader USB can be connected to any PC, Mac or Linux computer with a USB port
and the appropriate FTDI USB drivers installed. The drivers should be installed prior to connecting the
hardware to your computer. The drivers for PC can be obtained from the Parallax website by going to
the Support tab and selecting Downloads/FTDI USB Drivers. Other drivers, including Mac and Linux can
be downloaded from the FTDI website at the following URL.
When the RFID Card Reader USB is connected to a computer with the appropriate drivers a COM port is
automatically assigned to it. This COM port can be accessed by any program or programming language
you choose that can open a COM port @ 2400 bps (8N1). Parallax has released a free sample program
(including source code) for reading the tags in Windows XP/Vista. This program and VB.net source code
can be downloaded from the RFID Card Reader product page by going to our website and typing in the
product number 28340. You can also use the BASIC Stamp Editor DEBUG window to see tag data.
Checking the DTR box in the toolbar will enable the RFID Card Reader to send tag data to the display.
Copyright © Parallax Inc.
Line
RX
DTR
Port Function
Serial Receive
Data Terminal Ready
RFID Card Reader Serial & USB (#28140 / 28340)
Function
Serial data from RFID Card Reader USB
Activate/De-activate RFID Card Reader USB
http://www.ftdichip.com/Drivers/VCP.htm
v2.1 8/28/2008 Page 4 of 11