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Table E-2.
Printing enabled/disabled signals and control conditions
SLCT IN
DC1/DC3
(Indicator on)
(Data on/off contr.)
ERROR
BUSY
ACKNLG
Printing
(Disabled/enabled)
ON LINE
LOW
DC1/DC3
(Sw. 2-1/interface)
(no effect)
HIGH HIGH/LOW
PULSE EA. CHAR.
ENABLED
(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.