Magnetic Indicator

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The Magnetic card reader writer – from Data History to Flexible Modern Device

The Magnetic card reader writer is one of the most historic methods of data storage. Originally. Magnetic cards were used to store programs, which were then transported between installations and entered into their host computers via the magnetic card reader.

These days, the Magnetic card reader writer is most commonly used as access control, or to verify information about a card holder’s personal details (for example bank details). The simplest form of magnetic card programming and action is a simple yes or no: the card is programmed with a condition, which must be met in order for the system to deliver a “yes” and allow a specified action to occur.

So in the case of a simple access control system, the Magnetic card reader writer might program the magnetic stripe on the back of the card with a pair of dates – the “from” and “to” dates between which the card is valid for entry. This is most commonly seen in the electronic door keys used by modern hotels.

When the card is inserted into the Magnetic card reader writer (in our hotel example, there is a reader writer embedded in the door lock itself), the device reads the “from” and “to” dates encoded in the strip, and sends that information to the computer at the heart of the system. The computer (or in standalone cases, a single Magnetic card reader writer device) is programmed with a set of conditions that the information on the magnetic strip must meet.

In the case of a simply programmed entry and exit card, the computer program matches the actual date with the “from” and “to” dates encoded in the strip. If the actual date falls on or between the “from” and “to” dates, the lock opens. If it doesn’t, it doesn’t.

Clearly on the last day of occupancy, the guest must be able to get in using the Magnetic card reader writer for a short period in the morning (up until checkout). So the computer will probably be programmed with a condition that expresses the following in code: if today’s date matches the “to” date programmed on the card, then only open the door if it is before 1100 hours.

Of course, a magnetic card can theoretically be programmed with as much information as the end user deems necessary. And the conditions for activating a “yes” or “no” response in the system can be concomitantly complicated.

Discover Magnetic Indicator On eBay Below:

1PCS NEW MITUTOYO 7033B Magnetic Base For Dial and Test Indicators
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Magnetic Base Stand Holder for Dial Test Indicator DTI Gauge Clock Gauge TDC
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Magnetic Base Dial Gauge Angle Finder 0 to 90 Degree Indicator NEW PITTSBURGH
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4 Pc 170 Lbs Cap Standard Magnetic Base Dial Indicator Holder w Fine Adjustment
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AccusizeTools MAGNETIC BACK WITH 0 1 X 0001 DIAL INDICATORS EG08 1600 New
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2 Electronic Magnetic Z Axis Zero Setter 0002 Gage Gauge Height Up To 50mm
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Magnetic Holder Dial gauge Indicator Gauge Holder WC6 F
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Magnetic 001 Dial Indicator Point Precision TR72020 Set Holder Base Stand Kit
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Mitutoyo 7012 Flexible Magnetic Indicator Dial Stand New No7012
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Magnetic Base Dial Test Indicator Stand For Dial Gauges 60kgs Force
Magnetic Base Dial Test Indicator Stand For Dial Gauges 60kgs Force
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4 Pc Standard Magnetic Base Holder 170 Lbs Cap For Dial Test Indicator Tool
4 Pc Standard Magnetic Base Holder 170 Lbs Cap For Dial Test Indicator Tool
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Mitutoyo 64PKA075 Tool Kit 0 1 Range Dial Indicator Magnetic Base
Mitutoyo 64PKA075 Tool Kit 0 1 Range Dial Indicator Magnetic Base
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Flexbar High Power Magnetic Dial Indicator Base with Indicator Attachment End
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Dial Test Indicator 001mm Accuracy and Magnetic Base for Measuring Lathe SN T
Dial Test Indicator 001mm Accuracy and Magnetic Base for Measuring Lathe SN T
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Dial Indicator Magnetic Base  Point Precision Inspection Set New
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Hfs R Magnetic Base Indicator Back Holder For Agd2 1 Dial Indicator
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Dial Indicator Set W On Off Magnetic Base Polished Chrome Control Arm Adjustable
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HFS R Magnetic Base Indicator Back holder For AGD2 1 Dial Indicator
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Pro Series by HHIP 4401 0062 Z Axis Setting Indicator on Magnetic Base 2 x 2
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Universal Magnetic Metal Base Holder Stand Dial Test Indicator Flexible Tool 1pc
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Metalwork Gimbal Dial Lever Dial Indicator Holder Lock Magnetic Base Station
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Dial Indicator Set with On Off Magnetic Base Precision Inspection Set New
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Magnetic Base Metal Test Indicator Holder Tool Stand Adjustable Flexible Precise
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0 10mm Precision Lever Dial Test Indicator With Magnetic Base Holder Stand FDD
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Starrett 657A Magnetic Base and Swivel Post Assembly for Magnetic Base Indicator
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4 x MITUTOYO MAGNETIC BASE 7011S 10 FOR DIAL INDICATOR AMP GAUGES MADE IN JAPAN
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NEW MITUTOYO MAGNETIC BASE 7010S 10 FOR DIAL INDICATOR  GAUGES MADE IN JAPAN
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MITUTOYO DIAL INDICATOR 2046S WITH JAPAN MADE MITUTOYO MAGNETIC BASE 7011S
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DIAL INDICATOR 0 10MM 001MM WITH ON OFF MAGNETIC BASE FINE ADJUSTABLE ARM
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Magnetic Base with Fine Adjustment and SAE Dial Test Indicator with 00005 Reso
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ELE International Magnetic Indicator Holder Item 8679
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Magnetic Dial Indicator Mount with BG Dial 001
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Starrett 196 Dial Test Indicator 0001 Magnetic Base Brass Post with Wood Box
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Magnetic Base with Fine Adjustment and SAE Dial Test Indicator with 00005
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Heavy Duty Magnetic Base Indicator Holder
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