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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.