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Table F-2. Printing enabled/disabled signals and control
conditions
On Line
(Indicator on)
SLCT IN
DC1/DC3
(Data on/off contr.)
ERROR
BUSY
ACKNLG
ON LINE
LOW
DC1 /DC3
(S
W
. 2-1/interface)
(no effect)
HIGH HIGH/LOW PULSED EA. CHAR.
ON LINE
HIGH
DC1 RECV’D HIGH HIGH/LOW
PULSED EA. CHAR
ON LINE
HIGH
DC3 RECV’D HIGH
HIGH/LOW
PULSED EA. CHAR.
OFF LINE
HIGH/LOW DC1/DC3
(no effect)
(no effect)
LOW
HIGH NOT GENERATED
Printing
(Disabled/enabled)
ENABLED
(normal cond.)
ENABLED
*DISABLED
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.