Serial Port Pin Assignments; Keyboard Connector Pin Assignments - Epson Apex 20020, 20040 User Manual

Serial Port Pin Assignments

Pin no.
1
2
3
4
5
6
7
8
9
I = Input

Keyboard Connector Pin Assignments

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