Flashcards
External Hardware Part 1
Flashcards do conjunto (5)
- 1Barcode Scanner CharacteristicsConsists of internal decoder and a cable, both connected to computer through ports. Consists of a light source, a lens and a photo conductor that turn optical pulses into electrical pulses.
Also contains a decoder circuit which analyzes the barcode's data provided by the photo conductor, then sends the content to the scanner's output port.
Can be handheld, handsfree, wearable, laser or digital. - 2Barcode Scanner PurposeBarcode scanners read from a barcode and decode it, sending the contents through to somewhere that can display them.
- 3Barcode Scanner Suitability Part 1Two types of barcode scanner: Contact and Non-Contact.
Contact scanners suitable for small businesses - low maintenance + less expensive than laser guns / CCD readers. - 4Barcode Scanner Suitability Part 2Non-contact scanners suitable for when items can't be brought to the scanner (e.g. too heavy) - these scanners can scan barcodes from up to several feet away, depending on design of scanner and size of input.
Fixed non-contact scanners best for when items move past scanner, like in supermarkets. That's the constant beeping noise. - 5Barcode Scanner Principles of OperationSensor in barcode scanner detects light reflected by white stripes of barcode and generates analogue signal to be sent to decoder. Decoder interprets signal, validates barcode using check digit, and converts into text or whatever data format is stored on barcode
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- A level Computing FlashCards sobre External Hardware Part 1, criado por Jeffrey Stanley em 26-04-2017.
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- Jeffrey Stanley
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