Cn4: Ps/2 Keyboard And Ps/2 Mouse Connectors; Cn2, J3: Com1/2 Serial Ports - Global American 2808040 User Manual

CN4: PS/2 Keyboard and PS/2 Mouse Connectors

Mouse (top)
Keyboard (bottom)

CN2, J3: COM1/2 Serial Ports

CN2 (COM1) is a DB-9 connector, while J3 is a COM pin-header
connector.
Signal Name
DCD, Data carrier detect
RXD, Receive data
TXD, Transmit data
DTR, Data terminal ready
GND, ground
J3: COM2 is jumper selectable for RS-232, RS-422 and RS-485.
Pin #
10
14
Keyboard Signal
Keyboard data
N.C.
GND
5V
Keyboard clock
N.C.
Pin #
1
2
3
4
5
Signal Name
RS-232
1 DCD
2 RX
3 TX
4 DTR
5 Ground
6 DSR
7 RTS
8 CTS
9 RI
NC
Pin #
1
2
3
4
5
6
Pin # Signal Name
6 DSR, Data set ready
7 RTS, Request to send
8 CTS, Clear to send
9 RI, Ring indicator
10
R2-422 RS-485
TX- DATA-
TX+ DATA+
RX+ NC
RX- NC
Ground Ground
NC NC
NC NC
NC NC
NC NC
NC NC
Mouse Signal
Mouse data
N.C.
GND
5V
Mouse clock
N.C.
Not Used