There are several methods within PxPlus to generate an ESCape character: CHR(27), $1B$, esc variable, and 'ES' mnemonic. In most cases, the 'ES' mnemonic is (and should be) set to a value of $1B$.
However, certain printers may use a different "attention" character, e.g., Printronix typically uses $01$. Would this be a better use of the 'ES' mnemonic, since a $1B$ wouldn't necessarily do what one would expect?
Thoughts?