REV.-A
Table 1-18 shows the printer select/deselect (DC
l/DC3)
control, including relations among ON-LINE,
f
:):>
SLCT-IN
input, DC
1
/DC3,
and interface signals.
Table 1-18. Printer Select/Deselect Control
ON-LINE SW
SLCT-IN
Dcl/Dc3
ERROR
BUSY
ACKNLG
DATA ENTRY
OFF-LINE
HIGH/LOW
DC
l/DC3
LOW HIGH
No pulse Disable
ON-LINE HIGH
DC 1
HIGH
LOW\HIGH
Pulse output
Enable
(Nor-
(During data
after entry
mal
Process)
entry)
DC3 HIGH
LOW\HIGH
Pulse output
Enable
(During data
after entry
(Waits DC1.
entry)
See Note 2)
LOW
DC 1
HIGH
LOW/HIGH
Pulse output
(During data after entry
entry)
Enable (Nor-
DC3 HIGH
LOW/HIGH
Pulse output
mal
Process)
(During data
after entry
entry)
.
.
L
NOTES: 1. In the Table 1-18, it is assumed that no ERROR status exists other than that attributable
to OFF-LINE mode.
2. Once the printer is deselected by the
DC3
code, the printer will not revert the selected state
unless the DC 1 code is input again. (In the deselected state, the printer ignores input data
until the DC
1
code is received.)
3. The DC 1 and
DC3
codes are enabled only when the
SLCT-IN
signal (Input Connector No.36
for the parallel interface unit) is HIGH and printer power is initialized.
4. If the
SLCT-IN
signal is LOW when the printer is initialized, DC
l/DC3
printer select/deselect
control is invalidated, and these control codes are ignored.
5. If the
SLCT-IN
signal is HIGH and is not set to LOW by jumper 6 when printer initialized,
the printer starts from the selected (DC 1 ) state.
f-:
1-16
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