Code 128 Specifications - Worth Data 7100 RF Terminal Series Owner's Manual

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 Trans-
mission". 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 lev-
els 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 dis-
played by the bar code reader. Code 128 bar codes can be made up of only one subset or may be a combination of several.
12345
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.
The UCC Serial Shipping Container Code specification calls for a 19 digit UCC/EAN 128 code with an additional Mod 10
Check digit (20 digits in all). The Mod 10 Check digit is calculated the same as the Interleaved 2 of 5 example in Appendix D. It
is the data length as well as the MOD 10 check digit that distinguishes the UCC Serial Shipping Container Code from other UCC
/EAN 128 bar codes.
Scanning the appropriate bar codes on the RF Terminal Setup Menu enables UCC/EAN 128; or you can use the keypad in the
PROGRAMMING MODE "Change Setup" option. If UCC/EAN 128 is enabled, you will be able to read both standard Code 128
bar codes as well as the UCC/EAN 128 bar codes with the Function 1 character and the Mod 10 check character.
If UCC/EAN-128 is enabled on the RF Terminal reader, all Function 1 codes are transmitted as ]C1. In addition, should you be
reading a 20 digit Shipping Serial Container code, the Mod 10 check digit is also compared with the computed Mod 10 value to
give further assurance of no substitutions. The UCC/EAN-128 Shipping Serial Container Code is a subset of UCC-128 or EAN-
128 adopted for voluntary marking of shipping boxes with the exact serial number of the box, (used with EDI typically to identify
a specific boxes contents. The code consists of the following format:
UCC-128 Shipping Container Code
82