Datamax Prodigy Operator's Manual page 67

2. The Printer begins to look for strings terminated by ASCII CRs
(DEC 13, HEX 0D). The interpreter takes the data in the string and
places the appropriate pieces into the appropriate registers.
Whenever the Printer encounters an ASCII control code that has a
value of less than 32, the data is not accepted. The beginning of that
field is considered invalid and is discarded.
The rules that the interpreter uses for placing data into registers are
detailed in the previous tables. The tables show that the first 15
bytes received control the rotation, font, magnification, bar height,
and print location of the data to be printed. The remaining
characters in the string are the actual data.
3. The first character of a field that is received is shown in the table to
be an ASCII character that selects the rotation. The possible choices
for rotation are 1, 2, 3, and 4. If the Printer receives any other
character as the first character in a command string, it will not
consider this data to specify a field. It will check the string as a
possible command for other action. If the string cannot be matched
to a command, it will be discarded by the Printer.
The diagram on the next page details the direction of data that each
rotation will give with respect to the label feed direction and the
label opening in the front of the Printer.
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Using the Printer Page - 59