Powercast’s Multi-Sensor RFID Tags Boast 10 Meter Read Range

The industry's first RFID Sensor Tags which can include multiple sensors in a single tag, and provide the industry's longest read range of 10 meters, or 32 feet.

"We call it high-function RFID because these new passive RFID Sensor Tags have more than 10 times the operational power of standard passive RFID tags enabling advanced features and unparalleled computing power," said Dr. Charles Greene,...

Read more

Date: 2017-11-05 11:20:29
Website: http://www.prweb.com

Digitizing Vehicle Manufacturing with RFID Tags | Machine ...

RFID tags provide the automotive industry with assembly tracking tools, thus bringing vehicle assembly into the IoT world.

Carlos Gonzalez | Jan 11, 2018

Radio-frequency identification tags (RFID) have become an essential method of tracking not only shipping products, but also components in manufacturing assembly. They are currently used to control shopping, logistics, warehouses, stock, and...

Read more

Date: 2018-01-12 06:07:33
Website: machinedesign.com

RFID Interfacing with 8051 Microcontroller (AT89C51) using ...

Developed By:�

Himanshu Choudhary

This topic covers the interfacing of RFID system with microcontroller through serial interrupt. An RFID system consists of a reader device and a transponder. A transponder or tag has a unique serial number which is identified by the reader. RFID tag is applied to products, individuals or animals to identify and track them through this number.

The...

Read more


Website: https://www.engineersgarage.com

RFID dictionary definition | RFID defined

radio frequency identification

rfid - Computer Definition

(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive...

Read more

Date: 2017-12-09 03:55:18
Website: http://www.yourdictionary.com

SAG RFID Tags, Labels, Encoded RFID, Tracking Labels ...

SAG RFID Tags

Spring Wristband Tag

SAG tries to answer the demand of wristband tag in every possible territory from swimming pool to sauna.SAG's new Spring Wristband can perfectly fit every user's hand by the help of the elastic and spiral cord as its watch band. The watch head is made of injected silicone which makes the chip inside waterproof. With Mifare S50 and the new SONY RC-S965 chip, such...

Read more

Date: 2015-03-24 23:14:43
Website: http://www.fastrfid.com

Press Release - RFID Sensor Tags for Environmental ...

Powercast's Multi-Sensor RFID Tags Boast 10 Meter Read Range

 

Battery-free and rechargeable battery versions can include multiple sensors in a single tag, and leverage existing UHF RFID infrastructure

 

Phoenix, AZ - RFID Journal Live! - May 9, 2017 -- Powercast Corporation, the leader in wireless power-over-distance technology for 14 years, today announced the industry's first RFID Sensor...

Read more


Website: http://www.powercastco.com

passive programmable rfid animal cattle management

passive programmable rfid animal cattle management

Basic RFID Components | Beef Magazine

Transponders for radio-frequency identification (RFID) in the beef industry areElectronic circuits in the transponder can be programmed as Read Only (R/O)are placed permanently to read tags as cattle flow by a certain physical location.you to actually tie electronic identity to production and management...

Read more


Website: http://urjaindustries.co.in

RFID Threat - TrendLabs Security Intelligence Blog

A completely different category of threats arises when hackers or criminals cause valid RFID tags to behave in unexpected (and generally malicious) ways. Typically, computer-bound or mobile RFID readers query RFID tags for their unique identifier or on-tag data, which often serves as a database key or launches some real-world activity. For example, when an RFID reader at a supermarket checkout counter reads the tag on a product, the software driving it could add the item scanned to the list of the customer's purchases, tallying up the total after all products have...

Read more


Website: blog.trendmicro.com

Related topics : active rfid tags and readers price / active rfid tag and reader / active rfid tag reader / world tag rfid reader / read write rfid tags

RFID and Inventory Control - ADC Barcode

RFID and Inventory Control

What is RFID?

RFID stands for Radio-Frequency Identification - which is a small tag like electronic devices that consist of a small chip and an antenna. The chip is capable of carrying 2,000 bytes of data or less.

The RFID device serves the same purpose as a barcode or magnetic strip on the back of a credit/debit card; it provides a unique identifier for that object....

Read more

Date: 2017-11-15 18:52:59
Website: adcbarcode.com

An introduction to RFID Tags, Passive, UHF

RFID Tags, Passive, UHF

Definition

An RFID tag (Radio Frequency IDentification Tag) can be uniquely identified by a receiver which decodes a radio signal that the tag transmits. Passive RFID tags are not directly powered, but absorb energy radiated by the reader. The energy is stored until there is sufficient to enable the tag to transmit a short burst of radio energy that is encoded...

Read more

Date: 2017-01-19 01:23:15
Website: http://sagedata.com

Related topics : small rfid tags long range / how much do active rfid tags cost / hf rfid tags cost / passive rfid tag and reader / passive rfid tag circuit

Barcode Printing & Thermal Label Printing Equipment ...

Barcode Planet > Barcode Printing & Thermal Label Printing Equipment & Supplies

Barcode Printing & Thermal Label Printing Equipment & Supplies

Thermal Printers

At Barcode Planet we have a large variety of Thermal Label Printers for all applications. We carry a complete line of products suitable for small to large-scale printing needs. Our product portfolio includes options from top brands like...

Read more


Website: http://www.barcodeplanet.com

Related topics : rfid label printing software / rfid tag reader software / rfid tag manager software / rfid tag design software / rfid label printing machine

passive RFID tag - Nexess - nexess-solutions.com

Passive, Active and Semi-Passive : which RFID technology for my application ?

To choose the right RFID tag you will use for your application, let's first have a look�of the technologies available on the market :

The passive RFID tag : as its name suggests, this RFID tag is purely passive, meaning�it does not include a battery. The passive tag uses the wave (magnetic or electromagnetic) from...

Read more


Website: nexess-solutions.com

RFID | Article about RFID by The Free Dictionary

RFID | Article about RFID by The Free Dictionary

https://encyclopedia2.thefreedictionary.com/RFID

Related to RFID: RFID chip

RFID:

see radio-frequency identification radio-frequency identification

(RFID), a technology that uses radio waves to transmit data and uniquely identify an animal, person, or thing. An RFID system typically consists of a tag and a reader.

..... Click the link for more...

Read more


Website: encyclopedia2.thefreedictionary.com

PPT - RFID Tags PowerPoint Presentation - ID:2647780

-Controversy

Electromagnetic Waves

Michael Faraday proposed in 1846 that both light and radio waves are part of electromagnetic energy.

In 1864 James Clerk Maxwell published his theory on electromagnetic fields and found that electric and magnetic energy propagate in transverse waves at the speed of light

In 1887 Heinrich Rudolf Hertz produced and studied electromagnetic waves. He concluded that...

Read more


Website: slideserve.com

Related topics : battery assisted passive rfid tag cost / difference between passive and active rfid tags technology / rfid active reader passive tag / difference between active rfid tag and passive rfid tag / cost of active and passive rfid tags

RFID | learn.parallax.com

Search

RFID

BlocklyProp block reference for using the RFID Reader (serial) with the Propeller Activity Board WX. Under construction!

RFID stands for Radio Frequency Identification. The Parallax RFID Reader Serial + Tag Sampler includes several unique RFID tags. This tutorial will show you how connect the RFID Card Reader to the Propeller...

Read more

Date: 2017-03-04 10:40:17
Website: learn.parallax.com

Related topics : parallax radio frequency identification (rfid) reader module / rfid card reader serial parallax / radio frequency identification tags (rfid) / rfid radio frequency identification tags / active rfid tag and reader

RFID Definition from PC Magazine Encyclopedia

Definition of: RFID

RFID

(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive their power from the RF waves coming...

Read more


Website: pcmag.com

RFID Definition from PC Magazine Encyclopedia

Definition of: RFID

RFID

(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive their power from the RF waves coming...

Read more


Website: pcmag.com

Related topics : rfid active reader passive tag / rfid passive tag reader cost / active rfid tags and readers price / cost of active and passive rfid tags / passive rfid tag reader price

Invisi-Tag® RFID

These frequencies determine what type of range the reader would detect RFID Tags. The RFID Reader sends enough radio waves to start the RFID tag's circuit. The activated tag then transmits the signal with an ASCII/Binary/EPC or other format of unique number. This unique serial number is related in a database to represent a product or information.

RFID Tags

RFID Tags are the receiver component of the system which receives the radio waves. The RFID tag is a crucial component of this system. There are two types of tags, active tags and passive tags.

Active Tags

An active tag has its own power source. The advantage of this particular tag is...

Read more


Website: https://invisi-tag.com

Passive RFID tags | Passive RFID tags from the top RFID ...

Invengo Passive UHF Metal RFID tag

Robust Design & Exceptional Performance The Invengo XCTF-8405-C03 is a passive UHF RFID metal tag designed for superior performance on a variety of surfaces particular on metal. Confirming to EPCglobal Class 1 Gen 2 and ISO 18000-6C this tag shows unsurpassed UHF performance reliable operation in dense reader environment and...

Read more


Website: http://www.rfidtags.com

Related topics : uhf passive rfid tag reader / passive uhf rfid tag range / passive uhf rfid tag / passive rfid tag read range / epc class 1 passive rfid tags

What is RFID Technology - About RFID (Radio Frequency ...

Purpose of Radio frequency Identification and Detection system is to facilitate data transmission through the portable device known as tag that is read with the help of RFID reader; and process it as per the needs of an application. Information transmitted with the help of tag offers location or identification along with other specifics of product tagged - purchase date, color, and price. Typical...

Read more


Website: https://www.engineersgarage.com

RFID-Based Security System - electronicsforu.com

A radio-frequency identification (RFID) based access-control system allows only authorised people to enter a particular area of an establishment. Authorised people are provided with unique tags, using which they can access that area. This RFID based security system is based on micro controller AT89C52 and comprises a RFID module, a LCD module for displaying the status and a relay for opening the...

Read more


Website: electronicsforu.com

Radio Frequency Identification for Beef Cattle - The ...

One of the newer methods in the cattle industry is Radio Frequency Identification (RFID) ear tags.

Radio frequency identification is any electronic identification system comprising a transponder containing a microantenna that, when read at a specific radio frequency, emits a signal containing a unique electronic code.

The three common physical forms of RFID transponders are ear tags, injectable...

Read more


Website: http://www.thecattlesite.com

Features of RFID tags - Centre National RFID

Features of RFID tags

�1. RFID tags classification, with or without an electronic chip

�A first classification for RFID tags is based on the presence or absence of an electronic chip.

RFID SAW tags (Surface Acoustic Wave) do not have integrated circuits.

Today they only represent a small part of the market ( a few %).

They are read-only transponders and do not include embedded energy. They...

Read more


Website: http://www.centrenational-rfid.com

Related topics : passive rfid tag and reader / passive rfid tag uses / difference between active rfid tag and passive rfid tag / epc class 1 passive rfid tags / battery assisted passive rfid tags price

Rugged RFID Tags For Bin & Container Tracking | Decade ...

RFID Tags and Systems

What is RFID?

Radio frequency identification, or RFID, is a generic term for technologies that use radio waves to automatically identify people or objects. There are several methods of identification, but the most common is to store a serial number that identifies a person or object, and perhaps other information, on a microchip that is attached to an antenna (the chip and...

Read more


Website: http://www.decadeproducts.com

Related topics : small rfid tags long range / programing rfid tags / rfid tags human implants / rfid tag and reader price / rfid tag and reader circuit

Essay: RFID (Radio Frequency Identification) - Essay UK ...

Essay: RFID (Radio Frequency Identification)

Essay: RFID (Radio Frequency Identification)

Abstract'RFID (Radio Frequency Identification) uses radio wave to identify an object. It's mainly used to automatic identification of object in similar manner to barcode but it is not replacement of barcode. Different varieties of RFID tags can be found in market based on their functionalities.

Index Terms -...

Read more


Website: essay.uk.com

UHF RFID Tags| UHF RFID Tags from the top RFID manufacturers

Invengo Passive UHF Metal RFID tag

Robust Design & Exceptional Performance The Invengo XCTF-8405-C03 is a passive UHF RFID metal tag designed for superior performance on a variety of surfaces particular on metal. Confirming to EPCglobal Class 1 Gen 2 and ISO 18000-6C this tag shows unsurpassed UHF performance reliable operation in dense reader environment and...

Read more


Website: http://www.rfidtags.com

Related topics : uhf passive rfid tag reader / uhf rfid tags metal / passive uhf rfid tag range / passive uhf rfid tag / uhf rfid tag reader

RFID Based Security System | Circuit Diagram Available

RFID Based Security System

This circuit is a security system that uses RF tags as security credentials. It comprises of a microcontroller AT89C52 and an RFID reader. -- By Bikramjeet Waraich

July 5, 2017

GET A FREE PASS TO IOTSHOW AND INDIA ELECTRONICS WEEK

A radio-frequency identification (RFID) based access-control system allows only authorised people to enter a particular area of an...

Read more


Website: electronicsforu.com

RFID Tag Printing & Encoding Services - atlasrfidstore.com

If you purchase custom printing and encoding, the atlasRFIDstore operations team will encode 24 digits of hexadecimal characters to the RFID tag's EPC memory. Specifically, the sequence will begin like this:

000000000000000000000001

That number will be augmented sequentially up to the number of tags that you purchased. So, if you purchased 5000 tags, your sequence will begin and end like...

Read more


Website: https://www.atlasrfidstore.com

Related topics : rfid tag epc memory / epc gen 2 rfid tag / rfid tag printing / printed rfid tags / epc rfid tag standard

What is RFID? - Taggit SA – Tag, track & trace

A host system is a system that manages the flow of data between the RFID readers and tags. This may have a complex structure, where different readers are located across different locations and data flows to the host computer through LANs or the Internet.

RFID Reader

Hand held reader

Fixed reader

A RFID reader can be fixed or hand held and is a device that activates the tag and retrieves the...

Read more


Website: taggitsa.co.za

RFID enabled wristbands - RFID inlays based silicon and ...

Contact us

RFID Wristbands

Wristband RFID active used the power of RFID (short for radio-frequency identification) technology, in a spectrum of colors, shapes, materials, and custom options to meet your unique RFID application needs.

RFID based bracelet can track data in real time and follow, it applications such as access control, file tracking, race timing, cashless payments, keyless door...

Read more


Website: https://makarfid.com

RFID Reader and Tag - Ultimate Guide on RFID Module ...

What is RFID Zombie tag

 A brief note on RFID Technology

RFID stands for radio frequency identification. RFID tags are small chips (usually comes in a smart card or visiting card shape) that are used in our day to day life for unlocking hotel rooms, entering into cars etc.These tiny chips along with an RFID reader forms the RFID system.

RFID  technology was first used during world war 2 to...

Read more

Date: 2017-11-29 11:23:57
Website: circuitstoday.com

Latest RFID UHF Animal Ear Tag for Cattle Tracking-RFID ...

Latest RFID UHF Animal Ear Tag for Cattle Tracking

DAILY RFID has recently released RFID UHF animal ear tag-03 suitable for using in medium size livestock to improve the efficiency of RFID cattle tracking. Operating at a frequency range of 860 to 960 MHz for global use, this UHF RFID ear tag provides long reading range of up to 5 meters to allow ranchers to verify individual livestock quickly...

Read more

Date: 2017-10-23 14:07:10
Website: rfid-in-china.com

QUIZ – 2017: Insights Current Affairs Quiz, 11 September 2017

4. Question

2 points

With reference to 'Radio Frequency Identification Technology (RFID) Tag', which of the following statements is/are correct?

1. It serves the same purpose as a barcode

2. It can be read from up to a few metres away

3. It does not need to be within direct line-of-sight of the reader to be read/tracked

Select the correct answer using the code given below:

a) 1 only

b) 2 and 3...

Read more


Website: http://www.insightsonindia.com

Rfid ppt - de.slideshare.net

Keine Notizen für die Folie

Rfid ppt

1. RFID Based Embedded System for Vehicle Tracking and Prevention of Road Accidents 1 Ronson Calvin Fernandes 110919053 Manipal Institute of Technology - Manipal 11/19/2013

2. 2 Contents Introduction What is RFID ? RFID Applications RFID System RFID Tag , RFID Reader , GSM How V.T works ? Design and Implementation Benefits of V.T ...

Read more


Website: de.slideshare.net

Xerafy Redefines the World’s Smallest RFID Tag With the ...

HONG KONG, Oct 22, 2015 - Xerafy, the world's leading innovator of RFID metal tags, unveils today the world's smallest passive UHF EPC Class 1 Gen 2 RFID metal tag with the introduction of the new XXS tags.

Just when you think RFID UHF tags could not possibly get any smaller, Xerafy builds on its know-how and experience in designing small and rugged RFID metal tags, to disrupt the market -- again...

Read more


Website: http://www.xerafy.com

Barcodes vs RFID, which is better for asset tracking?

Barcodes are largely universal, but RFID frequencies and types vary across applications and regions.

?

Barcodes

Barcoding is simpler and easier to set-up than RFID. Unless you actually need the additional functionality offered by RFID then stick to barcodes. Barcoding can be applied to most environments and heavy duty labels provide a viable option for the harshest of...

Read more


Website: fmis.co.uk

Barcodes vs RFID, which is better for asset tracking?

Barcodes are largely universal, but RFID frequencies and types vary across applications and regions.

?

Barcodes

Barcoding is simpler and easier to set-up than RFID. Unless you actually need the additional functionality offered by RFID then stick to barcodes. Barcoding can be applied to most environments and heavy duty labels provide a viable option for the harshest of...

Read more


Website: fmis.co.uk

Tag and register animals | OSPRI

All cattle and deer must be tagged with a NAIT approved RFID tag and registered in the NAIT online system within six months of birth or before they move off farm, whichever comes first.

Once NAIT animals are tagged, animal registration must be completed within 7 days, or before their first off farm movement.

NAIT tags cannot be removed without permission from NAIT

NAIT tags cannot be reused for...

Read more


Website: https://ospri.co.nz

Related topics : rfid tag id number / types of rfid tags and readers / cattle rfid tag reader / different types of rfid tag / rfid tags uses

RFID Technology: A Complete Overview | Electronics For You

Radio-frequency identification (RFID) technology involves the use of electromagnetic or electrostatic coupling in the RF portion of the electromagnetic spectrum to uniquely identify an object, animal or person. It has established itself in a wide range of markets including livestock identification and automated vehicle identification because of its ability to track moving objects. The technology...

Read more


Website: electronicsforu.com

RFID Readers, RFID Reader Manufacturer - D.O RFID Group

RFID handheld reader

D.O RFID Group

D.O RFID Group is a Hi-tech enterprise which specializes in RFID and IoT industry. We focus on the research, development, design, and production of smart cards, RFID Wristbands, RFID Labels and Tags.

Since 2003, our products have been exported to over 80 countries in Europe, North/South America, Australia, Middle East, Russia and Asia, widely used in...

Read more


Website: https://www.dorfidreader.com

RFID - Radio Frequency Identification Tags....!

Introduction

Radio Frequency Identification ( RFID ) has existed in some form or another for over 40 years. It is a method of automatically identifying a given object/person by storing and remotely retrieving information from small transponders, called RFID tags. These tags have an antenna built into them, which allows for the transmission and reception of radio waves from an RFID...

Read more

Date: 2011-11-15 20:48:59
Website: http://rfident.org

Related topics : radio frequency identification technology (rfid) / passive rfid tag and reader / active rfid tag and reader / radio frequency identification device rfid technology / a small passive uhf rfid tag for metallic item identification

RFID Programming Made Simple and Cheap - CodeGuru

RFID Programming Made Simple and Cheap

Posted by Bradley Jones on August 29th, 2006

Vote!

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >

Now the fun code begins. To use the RFID reader, you will need to create an RFID object and then open the reader. You also will want to create a few event...

Read more


Website: https://www.codeguru.com

RFID Technology Basics and Latest Applications | Types of ...

0 Comment

What is an RFID tag?

The RFID tag is a micro chip with an antenna in a compact package. The Tag can be attached to the object to be tracked through Radio frequency. The Tag's antenna picks up the signals from the RFID reader and then returns the signal usually with some additional data like unique serial number. The RFID tags are too small so that it can be incorporated in any objects....

Read more


Website: https://www.elprocus.com

US9183419B2 - Passive RFID assisted active RFID tag ...

Each item including the passive RFID tag 208 that is carried by the cart returns its EPC data to the passive RFID tag reader 104 when interrogated. The passive RFID tag reader 104 records in its internal memory the EPC data of each passive RFID tag 208 carried by the items on the cart. The passive RFID tag reader 104 may then transmit the received EPC data to the active RFID tag 102. The active...

Read more


Website: https://patents.google.com

RFID chip in solar modules: efficient tagging and ...

RFID chip in solar modules: efficient tagging and performance tracking?

In the military, every officer and soldier is numbered, and so are usually properly itemized goods in warehouses�or�animals in farms. Numbering individual people, things and livestock is a means to improve its organization and�management, and this is the idea behind�an�RFID chip in a solar module.

In most countries...

Read more


Website: sinovoltaics.com

RFID Requirements - Compliance Guides - easysoftcorp.com

To Do

RFID is in-addition-to BARCODING

If you dissect an RFID tag you will find an inlay on the adhesive side of the label. The inlay contains an RFID chip that is integrated with a thin-film squiggly antenna. The antenna is fairly large while the RFID chip in the center checks-in at about 1 mm by 1 mm square. Any printer can apply print to a label surface, but to print the label surface AND...

Read more


Website: https://easysoftcorp.com

Related topics : 433 mhz ultra high frequency active rfid tags / 433 mhz ultra high frequency active rfid / epc class 1 passive rfid tags / passive uhf rfid tag range / uhf passive rfid tag reader

Pre-Printed RFID Tags | DoD | DFARS | Military Shipping ...

Additional Info

EasyTAGs for DOD RFID

EasyTAGs are DOD RFID tags that are pre-programmed with globally unique RFID serial numbers. They can be purchased in batches of 50, 100, or more. The EasyTAGs can be stored and used against any number of contracts and National Stock Numbers (NSNs) over time until they are used-up. As a shipment is prepared, RFID tags are applied to CASES.

DoD RFID Background

When properly used, the EasyTAG DOD RFID Tags serve two functions. First, they improve receiving processes within the DoD by instantly linking the received goods directly to the contract and the invoice. Second, the...

Read more


Website: https://easysoftcorp.com

Related topics : dod passive rfid tags / dod rfid tag / passive rfid tag uses / rfid tag id number / rfid tags uses

How RFID Works & Antenna Design | EAGLE | Blog

How RFID Works & Antenna Design

Sam Sattel

Tips and Tricks

Tags and Readers: How RFID Works, and How to Design Your First RFID Tag Antenna

Radio-Frequency Identification (RFID) has been around for over 50 years, and in the last decade is finally cheap enough to mass-produce and place in everyday objects. This presents some new opportunities for electronics designers wanting to learn about RF and...

Read more


Website: https://www.autodesk.com

5 Cheap Methods For Indoor Robot Localization: BLE Beacon ...

1. BLE Beacons

XY Find It XY2 Second Generation Bluetooth Item Finder for iOS and Android

BLE Beacons are small devices available in a wide range of shapes to be mounted on walls, tables, etc. These devices are specially designed for indoor locations. A robot can detect the BLE beacon signal and calculate its position in the range of more than two beacons and estimate the location. The beacons...

Read more


Website: https://www.intorobotics.com

SD Card UHF RFID Readers | Products & Suppliers ...

SD Card UHF RFID Readers

Information: Catalog and Supplier Database for Engineering and Industrial Professionals.

Products/Services for SD Card UHF RFID Readers

 

RFID Readers - (140 companies)

Images credits: Motorola; Barcoding Inc.; CNet RFID readers are devices that perceive, interrogate, and amend RFID tags which have assigned a unique electronic identity to a physical article...

ID Card...

Read more


Website: http://www.globalspec.com

Related topics : radio frequency identification device rfid technology / radio frequency identification tags (rfid) / rfid chip card reader / rfid credit card reader writer / rfid smart card reader writer