Table 1-10. Printer Select/Deselect Control - Epson LQ-510 Technical Manual

REV.-A
Table 1-10 shows the printer select/deselect (DC1/DC3) control, including relations among ON-LINE,
SELECT-IN input, DC1/DC3,
ON-LINE SW
SLCT-IN
Off-Line
HIGH/LOW
On-Line
HIGH
LOW
NOTES: 1. In Table 1-10, it is assumed that no ERROR status exists other than that attributable to
OFF-LINE mode.
2. Once the printer has been put in the deselected state by the DC3 code, the printer will not revert
to the selected state unless the DC1 code is input again. (In the deselected state, the printer
ignores input data until the DC1 code is received.)
3. The DC1 and DC3 codes are enabled only when the SLCT-IN signal (Input Connector Number
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, DC1 /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 10 when the printer is initialized,
the printer starts from the selected (DC1) state.
LQ-510
and interface signals.

Table 1-10. Printer Select/Deselect Control

ERROR
DC1 / DC3
DC1 / DC3 LOW
DC1 HIGH
DC3 HIGH
DC1 HIGH
DC3 HIGH
GENERAL DESCRIPTION
ACKNLG
BUSY
No pulse
HIGH
LOW/HIGH Pulse output
(during data after entry
entry)
Pulse output
LOW/HIGH
after entry
(during data
entry)
Pulse output
LOW/HIGH
after entry
(during data
entry)
LOW/HIGH Pulse output
(during data after entry
entry)
DATA ENTRY
Disable
Enable (normal
process)
Enable (waits
for DC1, see
Note 2.)
Enable (normal
process)
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