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Data Processing Terms
Storekeeper 3 & 2 - Manual for watching over inventory and other things needed in a store
Bar Code Applications
printed in many formats to provide blocks for entering information by pen or typewriter that is later punched into the card on the keypunch. It is not necessary for you to learn the punch codes since most cards will be “punched  and  interpreted.”  That  is,  in  addition  to  the data punched into the card, the same information is printed (interpreted) along the top of the card in one or two lines. The character may be printed directly above the punch or may be placed in any position depending upon the machine being used. Most cards have either the top left or top right corner cut, although any corner may be cut. The card in figure 11-2 has the left comer cut. This corner cut provides  a  visual  means  to  identify  a  type  of  card  and to  make  sure  that  all  cards  are  facing  in  the  same direction and are right side up. It may also serve as a signal to a machine as they are being processed. To make effective use of the punched card, much of the information is converted to codes. This is necessary since  the  card  contains  only  80  columns.  Only  one character can be placed in each column. In studying the chapter  on  the  Military  Standard  Requisitioning  and Issue Procedures (MILSTRIP), you saw how codes are used to convey a great amount of information on the DD Form 1348. By  converting  the  requisition  information  to  a keypunched card, it can then be used to reproduce other cards  for  accounting,  stock  receipt,  and  requisition status file. The supplying activity can use the punched requisition to determine stock availability, prepare the invoice, update stock records, and perform financial accounting. A punched card becomes a permanent record that may be used for many purposes and used many times. For this reason they should be handled with care since a crease or rolled edge can jam a machine and delay a job while a new card is prepared. 3-OF-9 BAR CODE The 3-of-9 barcode is described in MIL-STD 1189, Standard Symbology for Making Unit Packs, Outer Containers, and Selected Documents. The code uses various arrangements of 5 bars and 4 spaces (hence the 9) of which 3 are wide (the 3) to represent any of 43 different  characters.  The  digits  0-9,  the  letters  A-Z,  6 special characters (/. + % $), and a blank space can be encoded by the 3-of-9. In addition to the barcode, MIL-STD  1189  requires  OCR-A  characters  to  appear above or below the bar codes. An example is shown in figure  11-3. This  code  is  read  by  electronic  devices  called scanners. These scanners have a hand held wand or light pen that is passed over the 3-of-9 bar code, either left  to  right  or  right  to  left.  There  are  both  stationary and portable scanners available. These scanners are very sensitive to the variations in the light and dark areas. The bar code data element can be as long as 32 characters with a start/stop mark (an asterisk) and a clear or blank space at both ends. The 3-of-9 bar code is self-checking—it  must  contain  an  exact  number  of Figure 11-2.-Example of a standard 80-column punched card. 11-2

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