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Service Manual
1.3.2 Serial Interface
Type:
Transfer system:
Full duplex
Asynchronous start-stop system
Synchronization:
Protocol:
X-ON/X-OFF (can be combined with
Transfer speed:
300,600,
Error:
Overrun error:
Parity error:
Framing error:
Breaking Character: Ignored
See Table 1-10.
Signal description:
Table 1-10. Serial Interface Pin Assignments
Pin No.
Signal Name
1
2
3
4
RTS
5
CTS
6
7
SIGNAL-GND
8
DCD
9
10
(SD-)
to
17 NC
18
19
NC
20
21-25
NC
Rev.
Start-bit:
1 bit
Stop-bit:
1 or 2 bits
Data length:
7 or 8 bits
Parity:
Odd, even, or none
control (can be combined with X-ON/X-OFF)
2400,4800,9600,19200,38400, or 57600 bps
Processed as missing data and replaced by
Replaced by
Replaced by
Connected to the printer chassis. The printer chassis
-
and the signal
Serial ASCII data output by the printer. It maintains "MARK'
state (LOW level) between transmitted character codes.
Logic O is at HIGH level ("SPACE") and logic 1 is at LOW level
("MARK").
Serial ASCII
IN
state (LOW level) between received character codes.
Transmission request signal output from the printer. It is
always at HIGH level during power ON.
IN
Always ignored.
Signal input to the printer.
The printer can transmit data through
IN
HIGH level. X-ON/X-OFF, however, can be transmitted
regardless of
(factory setting).
-
Ground.
IN
Always ignored.
OUT See Note 4.
OUT See Note 4.
Not connected.
IN
See Note 4.
Not connected.
Signal output by printer. When the
signal can be received by the printer. The
settings do not specify
while the printer power is on. When
for
control,
conditions.
The data
128 characters after
Not connected.
control)
Description
are connected to each other.
input to the printer. It maintains "MARK"
state. It can always be ignored by setting
signals HIGH, the
control, the signal level is HIGH
goes LOW in case of any error
from host computer must be stopped within
goes LOW.
General Description
while
is at
setting is used
1-17
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