Serial Interface - Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual

Service Manual

1.3.2 Serial Interface

Type:
Full duplex
Transfer system:
Synchronization: Asynchronous start-stop system
Start-bit:
Stop-bit:
Data length:
Parity:
X-ON/X-OFF (can be combined with DTR control)
Protocol:
Transfer speed: 300,600, 12tXl, 2400,4800,9600,19200,38400, or 57600 bps
Error: Overrun error:
Parity error:
Framing error:
Breaking Character: Ignored
See Table 1-10.
Signal description:
Table 1-10. Serial Interface Pin Assignments
Signal Name
Pin No.
1
2
3
4 RTS
5 CTS
6
7 SIGNAL-GND
8 DCD
9
10 (SD-)
17 NC
18
19 NC
20
NC
21-25
Rev. A
1 bit
1 or 2 bits
7 or 8 bits
Odd, even, or none
Processed as missing data and replaced by """
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 "MARK'
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 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
- 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
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.
Not connected.
General Description
Description
1-17