User`s manual

A–16 Bar Codes
• If more or less than twelve characters are used, or if any of the
characters used are illegal, an error message is printed.
Interleaved 2 of 5
The bar code symbol uses a series of wide and narrow bars and spaces to
represent numeric characters. The structure is 2 wide elements (bars or
spaces) and 3 narrow elements. In the bar code, two characters are
interleaved (paired); bars are used to represent the first character in the pair
and spaces are used to represent the second character in the pair.
The above is always true except with the START and STOP character codes.
The START character bar pattern consists of two dark bars and two light bars
for a total of four bars. The STOP character bar pattern has two dark bars and
one light bar for a total of three bars.
This style includes the following characteristics:
• Ten digit character set (0 – 9)
• START and STOP codes
• Illegal characters are not processed and are ignored.
• No CENTER code
• Intercharacter gap not definable
• A variable length of characters per complete symbol. If an odd number
of input digits is sent, the printer inserts a leading 0 to the data stream.
This encodes in the bar code symbol and prints in the human–readable
line.
• If a checksum is required for bar code readability, you must include it as
part of the data.
UPC–A
UPC–A has two dark bars and two light bars for a total of four bars. Each
light/dark bar is 1 – 4 modules wide. A module is the smallest increment that
can represent data. Zeros are represented by light modules and ones by dark
modules. Each character contains some combination of seven modules that
total two dark bars and two light bars.