Product Description
LQ-300 Service Manual
1.3.2 Serial Interface
The
LQ-300
is equipped with an 8-bit serial interface, standard.
Data format:
EIA-232D
serial
Synchronization: Asynchronous
Handshaking:
By
DTR
protocol, X-ON/X-OFF protocol,
ETX/ACK
protocol
Word length
Start bits: 1 bit
Data bits: 7 or 8 bits (selectable)
Parity bit:
Odd, even, or none (selectable)
Stop bits:
1 bit
Bit rate:
300,600,1200,2400,4800, 9600,19200 bps (selectable)
Logic level
MARK
~OgiCid
1):
SPACE (logical O):
–3 V to –25 V
+3 v to +25 v
Parity check:
Odd, even, or no parity bit (selectable)
Connectoc
EIA
standard 25-pin D-SUB female comector
Table 1-15. Signal and Connector Pin Assignments for Serial Interface
Pin No. Signal Name
I/o’
Description
1
Chassis
GND
—
Chassis ground.
2
TXD
out
Transmit serial data.
3 RXD
In
Receive serial data.
4
RTS
out
Request to send. Always SPACE level when the printer
is powered on. Pulled up to
+12V
via 4.7K Q wsistor.
7
Signal
GND
—
Return path for data and control signals.
11
REV
out
Conneoted
directly to the
DTR
signal.
20
DTR
out
Indicates that the printer is ready to receive data or not.
5,6,8-10,
12-19, NC
—
No connection (not used).
21-25
*
l%e
//0
column indicates the direction of the signal as viewed from the printer.
*
.
.
\
~
.
.
>,
,-,...
1-14
Rev.
A
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