Printronix L7032 Programmer's Reference Manual page 244

Chapter 3
Bar Codes
NOTE: VGL automatically checks ratio data for validity only within the
244
ratio Optional parameter (used in conjunction with 9 or :
above) representing the ratios for variable ratio bar
codes. Default ratios are overridden by the variable
ratio feature. The ratio data must be hexadecimal
numbers from 0 through 9 or A through F. VGL
automatically checks the input for validity. If an
invalid character is found in the ratio, an error
message is generated.
MSI bar codes use four-digit ratios. The ratios are
interpreted from left to right, measuring the size of
each bar or space, in dot width, in the following
pattern: narrow bar : narrow space : wide bar : wide
space . For example, enter 2244 in the ratio
parameter for:
2 dot-wide narrow bar
2 dot-wide narrow space
4 dot-wide wide bar
4 dot-wide wide space
allowable hexadecimal range. VGL does not verify that ratio data
creates acceptable wide/narrow element relationships for bar code
readability. For example, VGL accepts wide/narrow ratio values of 2
and 5, respectively; however, a narrow element larger than the wide
element produces an unreadable bar code. When designing unique
ratio data, carefully plot wide and narrow ratios to conform to
readable bar codes.
data
The bar code data. MSI encodes from 1 through 13
characters. The available characters for the data
field are 0 through 9 (hex 30 through 39).
(cc)G Terminates the bar code command. Enter the
SFCC for your VGL configuration immediately
followed by any valid command character or G, the
universal sequence terminator.