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2
PS/2 mouse data
3
GND
4
+5 V
DC
5
K.B. clock
6
PS/2 mouse clock
The SBC-400 offers two serial ports: one RS-232 and one RS-232/
422/485. Using the BIOS Peripheral Setup program, you can select
the address for each port or disable it.
The card mounting bracket has two serial port connectors. The DB-
9 connector on the top of the bracket is COMA, the RS-232 serial
port. The DB-9 connector on the bottom of the bracket is COMB,
the RS-232/422/485 serial port.
RS-232 serial ports are widely used for external input/output
devices. The RS-422 and RS-485, however, are popular for
industrial and laboratory applications because they offer high noise
resistance and long range communication (up to 4000 ft, 1200 m).
The RS-422 is communly used for two-way communication
between two devices, where as RS-485 is used for communication
between a single master and a network of slave modules.
COMA is the RS-232 serial port, and COMB can function as an
RS-232, RS-422, or RS-485, depending on the jumper settings for
JP23 and JP39. To select the desired serial port type for COMB,
adjust JP23 and JP39 as follows:
RS-232
1
1
JP23
1
JP39
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