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START
(cont)
STOP
SECTION VI.
TYPE 122 PRINTER
perform. exactly the sam.e logical functions.
One switch
is located on the front of the printer m.ain control panel,
and the second is located on the back of the m.ain con-
trol panel.
Having two different START switches in
convenient places in the printer perm.its the operator to
activate the START function while perform.ing activities
not within easy reach of the front of the m.ain control
panel (e. g., attending to paper stacking at the rear of
the printer).
This switch is used to start printing when the printer is
ready for operations, i. e., cycled up.
Pressing this
switch clears the check indicators and the printer con-
trol busy signal and,
if
there are no other interlocks
active, the printer is ready to receive print instruc-
tions from. the central processor.
The START switch
contains an indicator which is illum.inated whenever the
printer is signalling the printer control that it is able
to perform. a print instruction.
Like the START function described above, the STOP
function also has two separate switches located in con-
venient places in the printer.
The STOP switches are
physically located adjacent to the START switches, thus
perm.itting the operator to perform. logical start and
stop operations easily during all operating conditions.
Pressing the STOP switches when the printer is run-
ning causes the printer to STOP.
Activation of this
switch causes the printer to signal "printer busy" to
the printer control until the START switch is pre s sed.
In addition, pressing the STOP switch causes a "con-
trolled stop" in the printer; i. e., any stored instruc-
tion in the printer control is com.pletely processed,
including the printing of the present line and/or any
paper m.oving specified.
After the printer is stopped,
pressing the START switch causes the program. to
continue as though no interruption has occurred.
The STOP indicator is illum.inated whenever the printer
is signalling the printer control that it is unable to per-
form. print instructions, either because of previous
activation of the STOP switch or presence of other inter-
lock conditions in the printer.
This indication can be
caused by anyone of the following:
1.
The STOP switch has been activated, and the
START switch has not been pressed since;
2.
A printer interlock has occurred, and the
START switch has not been pressed since.
(The interlock m.ay or m.ay not have been
cleared. )
3.
A printer control CYCLE check has occurred,
and the START switch has not been pressed
since; or
4.
A FORMS indication (interlock) has occurred,
and the START switch has not been pressed
6-6
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