Epson Apex 200 User Manual - Page 156
Serial Port Pin Assignments, Keyboard Connector Pin Assignments, I = Input, O = output
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Serial Port Pin Assignments Pin no. 1 2 3 4 5 6 7 8 9 I = Input Signal name DCD RX TX DTR GND DSR RTS CTS RI O = output Direction I I O O - I O I I Description Data carrier detect Receive data Transmit data Data terminal ready Signal ground Data set ready Request to send Clear to send Ring indicator Keyboard Connector Pin Assignments Pin no. 1 2 3 4 5 6-8 I = Input Signal name Direction KBD CLK I/O KBD DATA I/O -KBD RESET O GND - +5V - NC - O = output Description Keyboard clock Keyboard data -Keyboard reset Ground Power No connection
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