Epson LQ 1050 Technical Manual - Page 25

Rev.-a, L/dc3, Slct-in, Dcl/dc3, L/dc3

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Page 25 highlights

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 OFF-LINE ON-LINE SLCT-IN HIGH/LOW HIGH Dcl/Dc3 DC l/DC3 DC 1 DC3 LOW DC 1 DC3 ERROR BUSY ACKNLG DATA ENTRY LOW HIGH No pulse Disable HIGH LOW\HIGH (During data entry) Pulse output after entry Enable (Normal Process) HIGH LOW\HIGH (During data entry) Pulse output after entry Enable (Waits DC1. See Note 2) HIGH LOW/HIGH Pulse output (During data after entry HIGH entry) LOW/HIGH Pulse output Enable (Normal Process) L (During data after entry entry) 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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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)
L
O
W
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