Direct :: Computer Science

DirectDirect insert methods.In this news report I am going to explain the different direct inputmethods starting off with ostracize codes.A one criterioncode number is really seven social units. A unit is allblack or white. A unit that is black would display as a kibosh. A unitthat is white would display as a space. other way of writing abarcode unit is 1 for a single unit black bar and 0 for a singleunit white space. For slip, the number 1 is composed of theseven units, 0011001 or space-space-bar-bar-space-space-bar.Remember, a single barcode number call fors seven units.Also, on a UPC barcode the equal add up on the left-hand side (theManufacturer Code) is coded different than the numbers on theright-hand side (Product Code). The left side numbers atomic number 18 actually theinverted or mirrored codes of the right side numbers, for instancewhat is a bar on the right-side, is a space on the left-side. Theright-side codes are called even parity codes because there is aneven number of black bar units. For instance the right-side 6 is101000 - 2 even-numbered black bar units. The left-side is called queer-parity because there is an odd number of black bar units. Forinstance, the left-side 6 is 0101111 - 5 odd-numbered black barunits. Having different coded numbers for each side allows the barcodeto be scanned in either direction.Direct input methods.In the second part of my report on direct input methods I am going tobe talk of the town about magnetic rap readers.A magnetic stripe reader, alike called a magstripe reader, is ahardware device that reads the information encoded in the magneticstripe located on the second of a plastic label. magnetized stripe readerscan be read by a calculator program through a serial port, USBconnection, or keyboard wedge, and are generally categorized by theway they read a badge. For instance, insertion readers require thatthe badge be inserted into the reader and then pulled out. Swipereaders require that the badge pass completely through the reader.The magnetic stripe on the back of a badge is composed of iron-basedmagnetic particles encased in plastic-like tape. separately magneticparticle in the stripe is a tiny bar magnet about 20-millionths of aninch long. When all the bar magnets are polarized in the samedirection, the magnetic stripe is blank. Information is written on thestripe by magnetizing the tiny bars in either a northmost or south poledirection with a special electromagnetic writer, called an encoder.The writing process, called flux reversal, causes a change in themagnetic demesne that can be detected by the magnetic stripe reader.