Epson LQ-860 - Impact Printer, User Manual

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Printing enabled/disabled signals and control conditions
The table below shows the relationship between printing being
enabled or disabled, the on line/off line status, and the receipt of the
data on/off control characters,
DC1
or DC3.
ON LINE SLCT IN DC1/DC3 ERROR BUSY ACKNLG Printing
(Indicator (Data
(Disabled/
on)
on/off
enabled)
control)
On line Low (J9 DC1/DC3 High High/Low Pulsed Enabled
interface) (no effect) ea. char. (normal
cond.)
On line High DC1 High
High/Low Pulsed Enabled
Recv’d ea. char.
On line High DC3 High High/Low Pulsed Disabled*
Recv’d ea. char.
Off line High/Low DC1/DC3 Low High Not
Disabled
(no effect) (no effect) generated
* While printing is disabled, character data is being received and acknowledged so
that the printer can look for another DC1 character, which would allow it to
resume printing.
Serial Interface
The built-in serial interface is an RS-232C asynchronous interface
with the following characteristics:
Data format
1 start bit
Data word length: 8 bit
Odd, even, or
no
parity
1 stop bit
Baud rate
300, 1200, 9600, 19200 bits per second
8-14
Technical Specifications