32398 datasheet, PDF - EEWORLD Datasheet

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32398: DescriptionRFID Transponder Tools RFID R/W 20 mm Titan World Tag; CategoryDevelopment board/suite/development tools; File Size100KB，10 Pages; ManufacturerParallax; Environmental Compliance

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32398 Overview

RFID Transponder Tools RFID R/W 20 mm Titan World Tag

32398 Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Parallax
Product Category	RFID Transponder Tools
RoHS	Details
Product	RFID Accessories
Dimensions	20 mm
Factory Pack Quantity	1

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Web Site:

www.parallax.com

Forums:

forums.parallax.com

Sales:

sales@parallax.com

Technical:

support@parallax.com

Office:

(916) 624-8333

Fax:

(916) 624-8003

Sales:

(888) 512-1024

Tech Support:

(888) 997-8267

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

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

Key Specifications

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)

RFID Tag Compatibility

The RFID Read/Write Module works exclusively with

the EM Microelectronics EM4x50 1kbit R/W

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

, or 4,294,967,296 possible combinations)

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).

RFID Read/Write Module, Serial (#28440)

v1.0 6/29/2010 Page 1 of 10

Usage

There are many ways to use the RFID Read/Write Module and associated tags, but the three most

common are as follows:

1) Read Only: Read the tag’s unique, non-changing 32-bit serial number

2) Read/Write: Read from and write up to 116 bytes of publicly accessible user data on the tag

3) Read/Write (Protected): Read from and write up to 116 bytes of password-protected user data

on the tag. In this mode, you must enter the correct 32-bit password in order for read and write

operations to be successful.

The RFID Read/Write Module is controlled by the host via a serial communications interface. The unit

waits in an idle state until it receives a valid header and command from the host, at which time the

module will perform the command and return a status/error byte indicating a success or failure and

command-specific data (if any). The module will then re-enter the idle state and wait for the next valid

header and command.

A visual indication of the RFID Read/Write Module’s state is given with the on-board LED (Light Emitting

Diode). When the module is successfully powered-up and is in an idle state, the LED will be GREEN;

when the module is in an active state (for example, searching for a valid tag or performing an operation

on the tag), the LED will be RED.

The face of the tag should be held parallel to the front or back face of the antenna (where the majority of

RF energy is emitted). If the tag is held sideways (for example, perpendicular to the antenna), you'll

either get no reading or a poor reading distance. 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 the reader may

not detect any of them. The tags available in the Parallax store have a read distance of approximately

3 inches. Actual distance may vary slightly depending on the size of the transponder tag and

environmental conditions of the application.

Communication Protocol

The RFID Read/Write Module is controlled by the host via a standard, asynchronous serial

communications interface configured at 9600 bps, 8 data bits, no parity, 1 stop bit, and least significant

bit first (8N1). The serial data expected and transmitted by the RFID Read/Write Module is 5V TTL-level,

non-inverted.

To communicate with the RFID Read/Write Module, the user must first send a three-byte header string of

!RW (in 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.

RFID Read/Write Module, Serial (#28440)

v1.0 6/29/2010 Page 3 of 10

0x05: RFID_Protect

Enable (lock) or disable (unlock) the tag’s password protection.

Input: Mode (1 byte), 0x00 to unlock, 0x01 to lock

Output: Status byte (1 byte)

Example:

SEROUT RFID_TX, Baud, ["!RW", RFID_Protect, 1] ' Lock the tag

SERIN RFID_RX, Baud, [err]

' Get status byte

Note: When the tag is locked, a successful login using the RFID_Login command is required before you

can enable/disable password protection, change the tag’s password, or read/write to the tag. If the tag is

locked and you are not successfully logged in, the RFID_Read command will return four bytes of 0x00 in

place of the actual user data and the RFID_Write command will return an error.

0x06: RFID_Reset

Log out and reset the tag.

Input: None

Output: Status byte (1 byte)

Example:

SEROUT RFID_TX, Baud, ["!RW", RFID_Reset]

SERIN RFID_RX, Baud, [err]

' Reset the tag

' Get status byte

Note: All user data will remain stored on the tag. You will need to re-login using RFID_Login if you want

to access a locked tag after calling this command. You can also reset the tag by removing it from the

proximity of the RFID Read/Write Module.

0x0F: RFID_ReadLegacy

Read the 40-bit unique serial number from an EM Microelectronics EM4100 read-only tag (used with

Parallax’s RFID Card Reader Serial, #28140, and USB, #28340).

Input: None

Output: Header (1 byte) + data (10 bytes) + footer (1 byte)

Example:

SEROUT RFID_TX, Baud, ["!RW", RFID_ReadLegacy]

SERIN RFID_RX, Baud, [header, STR data\10, footer]

' Read EM4100 unique serial #

' Get header, data, and footer

Note: The header and footer are used to identify that a correct string has been received from the

reader (they correspond to a line feed and carriage return characters, respectively). The middle ten bytes

are the tag's unique ID sent in a printable ASCII string. For example, for a tag with a valid ID of

0F0184F07A, the following bytes would be sent: 0x0A, 0x30, 0x46, 0x30, 0x31, 0x38, 0x34, 0x46, 0x30,

0x37, 0x41, 0x0D.

RFID Read/Write Module, Serial (#28440)

v1.0 6/29/2010 Page 5 of 10

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