Epson EPL-9000, Service Manual

Page: 28 / 162

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