28140 Parallax Inc, 28140 Datasheet - Page 6

• 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

manufacturing cost), the Parallax RFID Reader Module's antenna was designed with a specific inductance
and "Q" factor for 125 kHz RFID operation at a tag read distance of up to 1¾” - 3” inches.
Example Code
The following code examples read tags from a RFID Reader Module and compare the values to known
tags (stored in an EEPROM table).
' =========================================================================
'
'
'
'
'
'
'
'
'
'
'
' =========================================================================
' -----[ Program Description ]---------------------------------------------
'
' Reads tags from a Parallax RFID reader and compares to known tags (stored
' in EEPROM table).
' -----[ Revision History ]------------------------------------------------
' -----[ I/O Definitions ]-------------------------------------------------
SYMBOL
SYMBOL
SYMBOL
SYMBOL
' -----[ Constants ]-------------------------------------------------------
SYMBOL
' -----[ Variables ]-------------------------------------------------------
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
SYMBOL
Parallax, Inc. • RFID Reader Module (#28140) •Updated 02/2006 v1.1
File....... RFID.BS1
Purpose.... RFID Tag Reader / Simple Security System
Author..... (c) Parallax, Inc. -- All Rights Reserved
E-mail..... [e-mail]
Started....
Updated.... 07 FEB 2005
{$STAMP BS1}
{$PBASIC 1.0}
Enable
RX
Spkr
Latch
LastTag
tag0
tag1
tag2
tag3
tag4
tag5
tag6
tag7
tag8
tag9
tagNum
pntr
char
If tag is found, the program will disable a lock.
= 0
= 1
= 2
= 3
= 2
= B0
= B1
= B2
= B3
= B4
= B5
= B6
= B7
= B8
= B9
= B10
= B11
= B12
' low = reader on
' serial from reader
' speaker output
' lock/latch control
' 3 tags; 0 to 2
' RFID bytes buffer
' from EEPROM table
' pointer to char in table
' character from table
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