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Extensibility request:
The printer responds to the extensibility
request in the affirmative when the
request is 00H or 04H, which means:
00H:
Request nibble mode of reverse channel
transfer
04H:
Request device ID in nibble mode of
reverse channel transfer
The following table lists the parallel connector pin assignments and
describes their respective interface signals.
Specifications, Command Summary, and Character Tables
A-15