Intermec EasyCoder PD4 Programmer's Reference Manual page 46

Chapter —Commands
Combination of several options can also be used, for example:
B50,300,0,3,1,2,50,B,"Deluxe"V01C2"Combo"TDV
01TT↵
:Writes a Code 39 bar code containing the information "Deluxe"
+ the contents of variable 01 + the contents of counter 2 + the
"Combo" + the current date + the contents of variable 01 + by
the current time.
Bar Code 128 family:
The Code 128 family has three unique data character subsets: A, B and C. The
choice of data character subset depends on the start character representing code
A, B or C. The code subset can be redefined within the symbol by code set
control characters A, B or C, or shift. In addition, a set of special functions are
available via FNC1, FNC2, FNC3 and FNC4. All these can be invoked in the
data field. The human readable part in the symbol, FNC and code subset control
characters will be represented by a space. The input data string is a fixed string of
maximum 64 alpha-numerical characters.
Code 128 with auto selection of subset and UCC/EAN:
Code 128 and EAN128 use automatic subset selection of subset A B or C, both
at the start and within the barcode.
Code 128 with manual selection of subset:
By starting the Code 128 symbol with manual selection of subset A, B or C,
the user has complete control of composing the symbol data output. By invok-
ing special control characters in the data string, it is possible to switch between
subsets or other special cases inside the symbol, see table below.
40 ESim v5.12 for EasyCoder PD4—Programmer's Reference Manual