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7. INTERFACE
Three interface types are available: parallel, serial RS-232C or serial RS-422A. Any of these interfaces
can be used by installing the corresponding PCB.
7.1 Serial Interface (RS-232C or RS-422A)
RS-232C
Connector Pin Assignment (D-SUB 25 pin)
Item
Specification
Data transfer method
Asynchronous serial interface
Data transfer rate
2400, 4800, 9600, 19200
Start bit: 1
Data bit: 7 or 8
Odd, even or no parity
Stop bit: 1
Signal polarity
Mark = logic “1” (–3 V to –15 V)
Space = logic “0” (+3 V to +15V)
Pin No.
Signal Name
IN/OUT
Function
1
F-GND
—
Frame ground
2
TXD
OUT
Transmit data
3
RXD
IN
Receive data
4
RTS
OUT
Send request signal. There is a space when the printer is
ready to receive.
5
CTS
IN
There is a space when the host computer is ready to
send. However, this signal is not checked by the printer.
6
N/C
Not used
7
S-GND
Signal ground
8 ~ 10
N/C
Not used
11
RCH
OUT
There is a space when the printer is ready to receive.
Same as pin 20.
12
N/C
Not used
13
S-GND
Signal ground
14
FAULT
OUT
There is a mark when an error is occurring in the printer.
15
Multi-TXD
OUT
Send data for multi printer
16
Multi-DTX
IN
Receive data for multi printer
17 ~ 19
N/C
Not used
20
DTR
Data terminal ready signal. There is a space when the
printer is ready to receive.
21 ~ 25
N/C
Not used
