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Interface Specifications
Printing enabled/disabled signals and control conditions
The table below shows the relationship between printing being
enabled or disabled, and the on-line/off-line condition, the printer
select signal (SLCT IN), and the receipt of data on/off control
character, DC1/DC3.
On-line
SLCT
IN
(Indicator
on)
ON-LINE
Low
(J9/
interface)
DCllDC3
ERROR
BUSY
ACKNLG
Printing
(Data
on/off
(Disabled/
control)
enabled)
DClIDC3
High
High/Low
Pulsed
ea.
Enabled
(no
effect)
char.
(normal
cond.)
ON-LINE
High DC1
Recv’d
High
High/low
Pulsed
ea.
Enabled
char.
ON-LINE
High
DC3
Recv’d
High
High/Low
Pulsed
ea.
*Disabled
char.
OFF-LINE
High/Low
DCl/DCB
Low
High
Not
Disabled
(no
effect)
(no
effect)
generated
*Even though printing is disabled, data characters are received and acknowledged, since the
printer is looking for another DC1 character, which would allow it to resume printing.
Serial interface
The LQ built-in serial interface is an RS-232C asynchronous
interface with the following characteristics:
Data format
1 start bit
Data word length: 8 bits
Odd, even or no parity
1 stop bit
Signal level
Mark (1) - 3V to - 27V
Space (0) + 3V to + 27V
Band rate
300, 1200, 4800, 9600 BPS
8-9