Epson LQ-850X User Manual - Page 266

Serial Interface

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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 (Indicator (Data on) on/off control) ACKNLG Printing (Disabled/ enabled) on line Low (J9 DC1/DC3 High interface) (no effect) High/Low Pulsed ea. char. Enabled (normal cond.) on line High DC1 High Recv'd High/Low Pulsed Enabled ea. char. on line High DC3 High Recv'd High/Low Pulsed Disabled* ea. char. off line High/Low DC1/DC3 Low High (no effect) (no effect) Not Disabled generated l 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 LQ 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 Technical Specifications 8-13

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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
l
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 LQ 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
Technical
Specifications
8-13