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Table E-2. Printing enabled/disabled signals and control conditions
On-Line
DC1/DC3
(Data on/off contr.)
ERROR BUSY
ACKNLG
Printing
(Disabled/enabled)
SLCT IN
(Indicator on)
ENABLED
ON-LINE
LOW
DC1 /DC3
(interface)
(no effect)
HIGH
HIGH/LOW PULSED EA. CHAR.
(normal cond.)
ON-LINE
HIGH
DC1 RECV’D HIGH
HIGH/LOW
PULSED EA. CHAR. ENABLED
ON-LINE
HIGH
DC3 RECV’D HIGH
HIGH/LOW
PULSED EA. CHAR. *DISABLED
OFF-LINE
HIGH/LOW
DC1 /DC3
(no effect)
(no effect)
LOW
HIGH
NOT GENERATED DISABLED
‘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.