Epson Apex 20020 - Manual (Page 156)

Serial Port Pin Assignments
Pin no. Signal name Direction Description
1 DCD I Data carrier detect
2 R X I Receive data
3 TX O Transmit data
4 DTR O Data terminal ready
5 GND
— Signal ground
6 DSR I Data set ready
7 RTS O Request to send
8 CTS I Clear to send
9 RI I Ring indicator
I = Input O = output
Keyboard Connector Pin Assignments
Pin no. Signal name Direction Description
1 KBD CLK
I/O
Keyboard clock
2 KBD DATA
I/O
Keyboard data
3 - K B D R E S E T O -Keyboard
reset
4 GND
—
Ground
5 +5V
—
Power
6-8 NC
— No connection
I = Input O = output