Paxar 9474 - Manual (Page 105)

All bar codes require a white space called the quiet zone for
successful scanning. The minimum quiet zone is .10 inches from
the left and right edges of the supply to the printed bars.
◆ You can print a UPC-A bar code rotated 180
o
on 1.2 inch wide
supply, but the quiet zone will be less than the minimum
specification.
◆ Code 39 and Code 128 bar codes accept a space as valid
data. If you are using fixed data for either of these bar codes,
you can use the shift/space key to insert a b/ (reserved space)
in the fixed data.
◆ To print human readable characters for UPC and EAN bar
codes, see "Human Readable Characters."
◆ To print human readable characters for Code 39, Interleaved 2
of 5, NW7, Code 128 and MSI bar codes, you must use a
sub-field. See "S)ub" later in this section.
◆ If you define a subfield as a standard UPC or EAN bar code,
the printer automatically fills the field from the left with zeros
to complete the bar code if necessary. UPC or EAN +2 or +5
bar codes do not automatically fill from the left.
S e l e c t i n g t h e B a r C o d e D e n s i t y
Format Entry Prompt:
Barcode density [1-5]: _
Values: 1 - 5 (Code 39)
1 - 4 (Interleaved 2 of 5)
1 - 3 (Code 128)
1 - 3 (MSI)
1 - 2 (UPC/EAN)
6-22 Designing and Entering a Format