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Interface Specifications
Interface timing
The figure below shows the timing for the parallel interface.
Printing enabled/disabled
signaIs
and control conditions
The table below shows the relationship between printing being
enabled or
diiiabled,
the
6n
line/off line status, and the receipt of
the data on/off control characters,
DC1
and
DC3.
SLCT
DC1mC3
(data
on/off
control)
High
Low
DC1
/DC3
High/Low Pulsed
Enabled
(Jlanterface)
(no effect)
ea. char.
(normal
cond.)
High
DC1
recv’d
High
High/Low
Pulsed
Enabled
ea. char.
High
DC3
recv’d
High
High/Low
Pulsed
l
Disabled
ea. char.
High/Low
DClIDC3
Low
High
Not
Disabled
(no effect) (no effect)
generated
*
While printing is disabled, the printer receives and acknowledges
character data so that it can look for another
DC1
character,
which allows it to resume printing.
8-14
Technical Specifications