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General Description
1.3.2 Serial Interface
Type:
Transfer system:
Full duplex
Synchronization:
Asynchronous start-stop system
Protocol:
X-ON/X-OFF (can be combined with DTR control)
Transfer speed:
300,600,1200,2400,4800, 9600,19200, 384KI, or 57600 bps
Overrun error:
Error:
Parity error:
Framing error:
Breaking character: Ignored
Signal description:
See Table 1-10.
Table 1-10. Serial Interface Pin Assignments
Pin No.
Signal Name
CHASSIS-GND
2
3
4
RTS
5
CTS
6
7
SIGNAL-GND
8
DCD
9
10
(SD-)
I 1 to 17 NC
18
19
NC
20
21-25
NC
1-16
1 bit
Start-bit:
1 or
Stop-bit:
Data length:
7 bits or 8 bits
Parity:
Odd, even, or none
Replaced by "*"
Replaced by "*"
Connected to the printer chassis. The printer chassis GND
-
and the signal GND are connected to each other.
Serial ASCII data output by the printer. It maintains
state (LOW level) between transmitted character codes.
Logic O is at HIGH level ("SPACE") and logic 1 is at LOW
level ("MARK').
Serial ASCII data input to the printer. It maintains "MARK"
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 TXD while
IN
HIGH level. X-ON/X-OFF, however, can be transmitted
regardless of DSR state. It can always be ignored by setting
-
Ground.
IN
Always ignored.
OUT
See note 4.
OUT
See note 4.
No connect.
IN
See note 4.
No connect.
Signal output by printer. When the DTR signals HIGH, the
settings do not specify DTR control, the signal level is HIGH
while the printer power is on. When SelecType setting is used
for DTR control, DTR goes LOW in case of any error
conditions.
The data (RXD) from host computer must be stopped within
128 characters after DTR goes LOW.
No connect.
bits
2
Description
"MARK"
Rev. A
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