Dascom 7010 Programmers Manual ZPL - Manual (Page 40)

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appropriate points within the field data string. The new subset will stay in effect until
changed with appropriate Invocation Code. For example, in Subset C, “ >7 “ in the field
data changes the Subset to A.
The table below shows the Code 128 Invocation Codes and Start Characters for the three
subsets.
A
N
Example of Code 128 - Subset B
Since Code 128 subset B is the most commonly used subset, ZPL® defaults to subset B if
no start character is specified in the data string. This is demonstrated in following two
samples.
The bar codes in the following two samples are identical.
The first two instructions (^XA^FO100,75) start the label format and sets the field origin
(from the upper-left corner) at which the bar code field begins to 100 dots across the x axis
and 75 dots down the y axis. The third instruction (^BCN,100,Y,N,N) calls for a Code 128