Epson Apex-80 - Manual (Page 42)

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If there are print codes in the document or file you are printing,
those codes will override your SelecType settings. This seldom
happens, since you usually won’t use SelecType with files that have
such codes, but if your Apex80 follows the SelecType instructions
for only part of a document, print codes in the document may
conflict with the SelecType modes.
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After you turn on a mode with SelecType, it stays in effect until the
printer is turned off or until you send a software command that
overrides it. (In general, software commands override SelecType
settings.) If, for example, you use SelecType to print a document in
emphasized type, anything you print after that will be emphasized
unless you first turn the printer off and back on.
3.4 SelecType