Interleaved 2 of 5 Barcode
(AKA I-2/5 or ITF)Overview The Interleaved 2 of 5 barcode font is a numeric only barcode used for encoding pairs of numbers in a high density barcode format. Interleaved 2 of 5 barcodes always contain an even number of digits because a single Interleaved character represents two numbers to achieve the high density. If a number containing an odd number of digits has to be encoded, a leading zero must be added to produce an even number of digits in the barcode. Interl 2/5 was designed for character self-checking, eliminating the requirement for checksum characters. However, checksum characters in this font maximize data integrity. This font can be difficult to use for non-programmers because the barcode symbols are interleaved and cannot be printed from the keyboard. If you are not required to use this font and you need an easy to use numeric barcode, consider our Codabar fonts which can be printed directly from the PC keyboard. Our Interleaved 2 of 5 barcode font was developed according to ANSI and European (CEN) standards. The symbology of the Interleaved 2 of 5 character set consists of bar code symbols representing characters 00 to 99, the space character and start / stop characters. The complete printed Interleaved 2 of 5 barcode consists of a leading quiet zone, a start pattern, Interleaved 2 of 5 symbols representing data, a stop pattern and a trailing quiet zone. According to ANSI specifications, the quiet zones must be 10 times the width of the short bar in the barcode; this is the width of the space character (ACSII 32) in the AdvanceMeants Interleaved 2 of 5 barcode font. Features These fonts are scaleable and should be printed at the correct font size to suit your application and scanning equipment. Twelve (12) versions of the Interleaved 2 of 5 barcode fonts are provided to support different width and height requirements. The last character in the font name determines the height of the barcode with the shortest being Interl6 and the tallest being Interl24. Human readable versions are also supplied with the shortest being InterlHR6 and the tallest being InterlHR24. These fonts were created to meet ANSI and CEN requirements when printing with the font size of 12 or greater. To determine which barcode font to use, first print out the Interl12 barcode font at various font sizes to determine which size is the smallest that will work with your scanning equipment. Then, choose the tallest version that will fit in your scanning area. The following is sample code from Visual Basic that selects the Interleaved 2 of 5 bar code font and size. Printer.FontName = "Interl12" Printer.CurrentX = 1500 Printer.CurrentY = 3000 Printer.FontSize = 20 Printer.Print variable These numbers must be printed using ASCII characters 130 to 229. The start, stop and space Interleaved 2 of 5 barcode characters are ASCII 40, 41 and 33. Because the ASCII characters 130 to 229 are extended ASCII characters, you will be unable to print them all from your keyboard. It is possible to copy and paste them from the Character Map application. If you are printing from an application, your application will have to pair up the numbers to print in the barcode, select the font, add 130 to the number and then print the ACSII character to produce the barcode as in the following example from Visual Basic. The following example uses the Visual Basic Chr command to print all 100 Interleaved 2 of 5 barcode characters from ACSII: Dim x As Integer Dim I As Integer For x = 0 To 99 Printer.FontSize = 12 Printer.Font = "Times New Roman" I = x + 130 'Add 130 to print I-2/5 from ACSII Printer.Print x 'Print the number first Printer.FontSize = 22 Printer.Font = "Interl12" 'Select the I-2/5 Font Printer.Print Chr(I) 'Print the I-2/5 Font Bar Codes Next x |
