Datamax ST-3210 Programmer's Manual page 19

DTPL TEXT LOGO (MACRO) SUPPLEMENT
The printer can store a string of DTPL commands (a macro) in memory as if they were a downloaded logo image.
These commands could then be used later on to print a ticket by using a print logo command.
However, instead of printing a logo image it will print a ticket according to the DTPL commands previously sent.
This is a handy feature when most of the tickets have the same format and only a few lines are different. It is also
useful in cutting down the communication time needed to print each ticket. In order for the DTPL commands to
be stored in memory and not be acted on immediately, you must bracket the DTPL string with esc(27d)
characters. The bracketed DTPL string is then considered an DTPL logo.
DTPL Programmer's Manual 15