28440 Parallax Inc, 28440 Datasheet

RFID Modules & Development Tools RFID Read/Write Serial Module

28440

Manufacturer Part Number
28440
Description
RFID Modules & Development Tools RFID Read/Write Serial Module
Manufacturer
Parallax Inc
Datasheet

Specifications of 28440

Operating Current
10 mA
Operating Voltage
5 V
Product
RFID Readers
Wireless Frequency
125 KHz
Dimensions
3.25 in x 2.45 in
Operating Temperature Range
- 40 C to + 85 C
For Use With/related Products
EM4x50
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
RFID Read/Write Module, Serial (#28440)
Designed in cooperation with Grand Idea Studio (www.grandideastudio.com), the Parallax Radio
Frequency Identification (RFID) Read/Write Module provides a low-cost solution to read and write passive
RFID transponder tags up to 3 inches away. The RFID transponder tags provide a unique serial number
and can store up to 116 bytes of user data, which can be password protected to allow only authorized
access.
The RFID Read/Write Module can be used in a wide variety of hobbyist and commercial applications,
including access control, user identification, robotics navigation, inventory tracking, payment systems, car
immobilization, and manufacturing automation.
Features
Key Specifications
RFID Tag Compatibility
The RFID Read/Write Module works exclusively with
the
transponder tags. A variety of different tag types and
styles exist, with the most popular ones made available
from Parallax.
Each tag contains a unique, read-only serial number (one of 2
and 116 bytes of user data area stored in a non-volatile EEPROM (Electrically Erasable Read Only
Memory). The user data area can be optionally secured with a 32-bit password to allow only authorized
read and write operations.
The RFID Read/Write Module provides, with a single command, legacy support for the EM
Microelectronics EM4100 read-only tags that are used with Parallax’s RFID Card Reader Serial (#28140)
and USB (#28340).
Copyright © Parallax Inc.
EM
Low-cost method for reading and writing
passive, 125 kHz RFID transponder tags
Up to 116 bytes of user data storage on a
single tag
Optional security features prevent tag from
being read or written without password
Bi-color LED for visual indication of status
Power requirements: +5 VDC; < 10 mA idle,
approx. 100-200 mA active
Communication: asynchronous serial 9600 bps,
(8N1); 5 V TTL-level, non-inverted
Dimensions: 3.25 x 2.45 in (8.26 x 6.2 cm)
Microelectronics
EM4x50
RFID Read/Write Module, Serial (#28440)
Web Site: www.parallax.com
Forums: forums.parallax.com
Sales: sales@parallax.com
Technical: support@parallax.com
1kbit
R/W
32
, or 4,294,967,296 possible combinations)
v1.0 6/29/2010 Page 1 of 10
Office: (916) 624-8333
Fax: (916) 624-8003
Sales: (888) 512-1024
Tech Support: (888) 997-8267

Related parts for 28440

28440 Summary of contents

Page 1

... USB (#28340). Copyright © Parallax Inc. Web Site: www.parallax.com Forums: forums.parallax.com Sales: sales@parallax.com Technical: support@parallax.com 1kbit R 4,294,967,296 possible combinations) RFID Read/Write Module, Serial (#28440) Office: (916) 624-8333 Fax: (916) 624-8003 Sales: (888) 512-1024 Tech Support: (888) 997-8267 v1.0 6/29/2010 Page ...

Page 2

... Serial input from host. TTL-level interface, 9600 bps, 8 data bits, no parity, 1 stop bit. Serial output to host. TTL-level interface, 9600 bps, 8 data bits, no parity, 1 stop bit. System ground. Connect to power supply’s ground (GND) terminal. RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page ...

Page 3

... ASCII), followed by the desired single-byte command (in hexadecimal). Certain commands require additional data to be sent along with the command. A status/error byte and a varying number of data bytes will be returned depending on the command called. Copyright © Parallax Inc. RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page ...

Page 4

... SEROUT RFID_TX, Baud, ["!RW", RFID_SetPass, REP $00\4, $FE, $ED, $BE, $EF] SERIN RFID_RX, Baud, [err] Copyright © Parallax Inc. ' Get status byte ' Get status byte RFID Read/Write Module, Serial (#28440) ' Read tag's serial number ' Get status byte & data bytes ' Get status byte v1.0 6/29/2010 Page ...

Page 5

... Copyright © Parallax Inc. ' Get status byte ' Reset the tag ' Get status byte ' Read EM4100 unique serial # ' Get header, data, and footer RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page ...

Page 6

... Non-volatile EEPROM storage area for user data (116 bytes) Device serial number (unique, read-only) Device identification (used to identify tag family, read-only) ADDR_Password and can be changed by the user via the are modified directly by the RFID Read/Write Module and, in normal RFID Read/Write Module, Serial (#28440) Description v1.0 6/29/2010 Page ...

Page 7

... Copyright © Parallax Inc. 32 Test Conditions --- --- --- +4.5V <= V +5.5V CC +4.5V <= V +5. +4. +4. RFID Read/Write Module, Serial (#28440 4,294,967,296, possible values. It Specification Unit Min. Typ. Max. 4.5 5.0 5.5 --- 9.4 --- --- 108 200 --- --- 0.8 2.0 --- --- --- --- ...

Page 8

... The example program shown below is a simple system-level test to read the tag ID and write a block of data. This .bs2 program, along with a more comprehensive code example demonstrating the full capabilities of the RFID Read/Write Module, is available for download on the product page; search “28440” at www.parallax.com. Copyright © Parallax Inc. RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page ...

Page 9

... Reset tag (1) $0F ' Read unique ID from EM4102 read-only tag ' (for backwards compatibility with Parallax ' RFID Card Reader, #28140 and #28340) (12 Password (not readable Protection Word 2 ' Control Word 32 ' Device Serial Number 33 ' Device Identification RFID Read/Write Module, Serial (#28440) v1.0 6/29/2010 Page ...

Page 10

... If we get an error, keep trying ' until the read is successful ' Print data ' into address 4 (user EEPROM area) ' Wait for status byte ' If we get an error, keep trying ' until the write is successful RFID Read/Write Module, Serial (#28440) ' Read tag's serial number v1.0 6/29/2010 Page ...

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