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RS-422A
Connector Pin Assignment
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” (–)
Space = logic “0” (+)
Pin No.
Signal Name
IN/OUT
Function
1
F-GND
Frame ground
2 ~ 6
N/C
Not used
7
S-GND
Signal ground
8
N/C
Not used
9
SD (+)
OUT
Send data
10
SD (–)
OUT
Send data
11 ~ 12
N/C
Not used
13
S-GND
Signal ground
14 ~ 16
N/C
Not used
17
RD (+)
IN
Receive data
18
RD (–)
IN
Receive data
19
CS (+)
IN
There is a space when the host computer is ready to
send. However, this signal is not checked by the printer.
20 ~ 22
N/C
Not used
23
CS (–)
IN
There is a space when the host computer is ready to
send. However, this signal is not checked by the printer.
24
RS (+)
OUT
Send request signal. There is a space when the printer is
ready to receive.
25
RS (–)
OUT
Send request signal. There is a space when the printer is
ready to receive.
