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Serial Port Pin Assignments
Pin no.
Signal name
Direction
Description
1
DCD
I
Data carrier detect
2
RX
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
-KBD RESET O
-Keyboard
reset
4
GND
—
Ground
5
+5V
—
Power
6-8 NC
—
No connection
I = Input O = output