17-10-2012, 03:55 PM
RFID data base
RFID DATABASE.pdf (Size: 95.37 KB / Downloads: 41)
RFID Reader
Radio Frequency Identification (RFID) Card Readers
provide a low-cost solution to read passive RFID
transponder tags up to 7 cm away. This 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.
The RFID card reader read the RFID tag in range and
outputs unique identification code of the tag at baud
rate of 9600. The data from RFID reader can be
interfaced to be read by microcontroller or PC.
Features
· Low-cost method for reading passive RFID transponder tags
· 9600 bps serial interface at 5V TTL level for direct interface to microcontrollers
· Buzzer & LED indicate valid RFID Tag detection
· Range up to 7 cm for 125 Khz RFID Cards or Keychains
Information
Each transponder tag contains a unique identifier (one of 240, or 1,099,511,627,776 possible
combinations) that is read by the RFID Card Reader and transmitted to the host via a simple serial
interface.
Communication
When the RFID Card Reader is active and a valid RFID transponder tag is placed within range of
the activated reader, the unique ID will be transmitted as a 12-byte printable ASCII string serially to
the host in the following format:
Using RFID Reader
When powered on the RFID reader will activate a RF field waiting for a tag to come into its range.
Once tag is detected, its unique ID number is read and data is sent via serial interface. The valid tag
detecting is indicated by LED blink and Buzzer beep. The face of the RFID tag should be held
parallel to the front of the antenna (where the majority of RF energy is focused). If the tag is held
sideways (perpendicular to the antenna) you may have difficulty getting the tag to be read. Only one
transponder tag should be held up to the antenna at any time. The use of multiple tags at one time
will cause tag collisions and confuse the reader. The tags available with us have a read distance of
approximately 7 cm. Actual distance may vary slightly depending on the size of the transponder tag
and environmental conditions of the application.