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Codabar Specifications
Codabar is widely used in libraries, blood banks, the cotton industry and transportation
industries. Its' character set consists of numbers 0 through 9, and punctuation characters
+ . - / : and $. Symbols a, b, c, d, t, n, * and e are used as start and stop characters.
Characters are constructed of four bars and three spaces.
Codabar is a numeric-only code, but different combinations of start and stop characters
can be used to identify different types of labels. Codabar's variable data length and extremely low error rate
make for a versatile bar code.
Codabar start/stop transmission
The Codabar section on the RF Terminal Setup Menu lets you determine whether Codabar start/stop
characters are transmitted or not. If you are varying start/stop characters with different types of labels,
you'll want to "Enable Stop/Start character Transmission". Start/stop character transmission can also be
helpful if you want your program to differentiate between data coming from the RF Terminal and data
coming from the keyboard. If neither of these situations apply, you'll probably want to disable it.
Code 128 Specifications
Code 128 is a very powerful bar code, combining an extensive character set and variable length with
compactness and error checking. The character set contains all 128 ASCII characters with each character
made up of three bars and three spaces. Each element (bar or space) varies from one to four units in width,
totaling 11 units of width per character. Code 128 contains two levels of error checking:
• Each character is checked for internal parity, and
• The last character is a checksum.
Code 128 has three subsets, A, B and C. Subset A contains alphanumeric characters and unprintable control
characters, subset B contains alphanumeric characters plus printable control characters and subset C
contains only numeric characters and uses a 2-character encoding scheme to create a more compact bar
code. Code 128 uses an internal Mod 103 check character that is not displayed by the bar
code reader. Code 128 bar codes can be made up of only one subset or may be a
combination of several.
The Code 39 features of Accumulate Mode, Caps Lock ON and Caps lock OFF also apply to Code 128.
UCC-128/ EAN-128
UCC-128/EAN-128 Code is a subset of Code 128 adopted by the UCC and EAN council’s for use as a
shipping label symbology. UCC/EAN-128 bar codes always start with a Function Code 1 character. In
addition, a Function Code 1 character terminates all variable length fields unless they are the last field in the
bar code.
The RF Terminal outputs the following for the special function codes and start sequences:
]C1 Start C/Function Code 1
^] (GS) Function Code 1 as a variable string terminator
If UCC/EAN 128 is enabled, the reader looks for the Start C/Function Code 1 to indicate a UCC/EAN 128
bar code.
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