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INSTALLATIONS
14 MB900-R User’s Manual
CN1: PS/2 Keyboard and PS/2 Mouse Connectors
Keyboard
Signal
Pin #
Mouse
Signal
Keyboard data
1
Mouse data
N.C.
2
N.C.
GND
3
GND
5V
4
5V
Keyboard clock
5
Mouse clock
Mouse (top)
Keyboard (bottom)
N.C.
6
N.C.
CN2, J2, J7, J8: COM1/2/3/4 Serial Ports
CN2 (COM1) is a DB-9 connector, while J2, J7 and J8 are a COM
pin-header connectors.
COM1 COM2
Signal Name
Pin #
Pin #
Signal Name
DCD, Data carrier detect
1
6
DSR, Data set ready
RXD, Receive data
2
7
RTS, Request to send
TXD, Transmit data
3
8
CTS, Clear to send
DTR, Data terminal ready
4
9
RI, Ring indicator
GND, ground
5
10
Not Used
COM2 is jumper selectable for RS -232, RS-422 and RS-485.
Pin #
Signal Name
RS-232
R2-422
RS-485
1
DCD
TX-
DATA-
2
RX
TX+
DATA+
3
TX
RX+
NC
4
DTR
RX-
NC
5
Ground
Ground
Ground
6
DSR
RTS-
NC
7
RTS
RTS+
NC
8
CTS
CTS+
NC
9
RI
CTS-
NC
10
NC
NC
NC