Epson C11C605001 Service Manual - Page 28

Table 1-10. Serial Interface Pin Assignments, 3.2 Serial Interface - error codes

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EPL-9000 Service Manual General Description 1.3.2 Serial Interface Type: Transfer system: Synchronization: Protocol: Transfer speed: Error: Signal description: RS-232C/R%122 Full duplex 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 X-ON/X-OFF (can be combined with DTR control) DTR control (can be combined with X-ON/X-OFF) 300,600, 12tXl, 2400,4800,9600,19200,38400, or 57600 bps Overrun error: Processed as missing data and replaced by """ Parity error: Replaced by "'" Framing error: Replaced by """ Breaking Character: Ignored See Table 1-10. Table 1-10. Serial Interface Pin Assignments Pin No. Signal Name 1 CHASSIS-GND 2 TXD 3 RXD (RXD+) 4 RTS 5 CTS 6 DSR 7 SIGNAL-GND 8 DCD 9 (SD+) 10 (SD-) 11 to 17 NC 18 (RD-) 19 NC 20 DTR 21-25 NC Uo Description - 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 "MARK' ~uT state (LOW level) between transmitted character codes. Logic O is at HIGH level ("SPACE") and logic 1 is at LOW level ("MARK"). IN Serial ASCII data input to the printer. It maintains "MARK" state (LOW level) between received character codes. OUT 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 DSR is at IN HIGH level. X-ON/X-OFF, however, can be transmitted regardless of DSR state. It can always be ignored by setting SelecType (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 DTR signals HIGH, the RXD signal can be received by the printer. The SelecType settings do not specify DTR control, the signal level is HIGH OUT 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. Not connected. Rev. A 1-17

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EPL-9000
Service Manual
General Description
1.3.2 Serial Interface
Type:
RS-232C/R%122
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
DTR
control)
DTR
control (can be combined with X-ON/X-OFF)
Transfer speed:
300,600,
12tXl,
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
Uo
Description
1
CHASSIS-GND
-
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 “MARK’
2
TXD
~uT
state
(LOW level) between transmitted character codes.
Logic O is at HIGH level (“SPACE”) and logic 1 is at LOW level
(“MARK”).
3
RXD
(RXD+)
IN
Serial ASCII
data
input to the printer. It maintains “MARK”
state (LOW level) between received character codes.
4
RTS
OUT
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
TXD
while
DSR
is at
6
DSR
IN
HIGH level. X-ON/X-OFF, however, can be transmitted
regardless of
DSR
state. It can always be ignored by setting
SelecType
(factory setting).
7
SIGNAL-GND
-
Ground.
8
DCD
IN
Always ignored.
9
(SD+)
OUT
See Note 4.
10
(SD-)
OUT
See Note
4.
11
to
17
NC
Not connected.
18
(RD-)
IN
See Note 4.
19
NC
Not connected.
Signal output by printer. When the
DTR
signals HIGH, the
RXD
signal can be received by the printer. The
SelecType
settings do not specify
DTR
control, the signal level is HIGH
20
DTR
OUT
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.
21-25
NC
Not connected.
Rev.
A
1-17