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Technical Specifications
Printing enabled/disabled signals and control conditions
The table below shows the relationship between printing being enabled
or disabled, and the on line/off line condition, the printer select signal
(SLCT IN), and the receipt of data on/off control character, DC1/DC3.
ON LINE
SLCT IN
DC1/DC3 ERROR BUSY
ACKNLG Printing
(Indicator)
(Data
(Disabled/
on)
on/off
enabled)
control)
on line
Low (Sw.
DC1/DC3 High
High/Low Pulsed ea. Enabled
2-1/
(no effect)
char.
(normal
interface)
cond.)
on line High
DC1
High High/Low
Pulsed ea. Enabled
Recv’d
char
on line
High
DC3 High
High/Low Pulsed ea. Disabled*
Recv’d
char.
off line
High/Low
DC1/DC3 Low
High
Not
Disabled
(no effect)
(no effect)
generated
*Even though printing is disabled, data characters are received and acknowledged,
since the printer
IS
looking for another DC1 character, which would allow it to resume
printing.
6-8
Technical Specifications