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cPCI-MXS64 Technical Reference Manual
2.9.3 Serial Port 3
The Serial Port 3 supports Infrared, RS-232, RS-422, and RS-485 operation modes. When
assigned as Serial Port 3, the port is 100% compatible with the IBM-AT serial port in RS-232
mode.
RS-422 and RS-485 modes allow communication using differential signals through one pair
of wires (RS-485) or two (RS-422) to increase the noise immunity during data transfers.
RS-422 and RS-485 protocols offer advantages such as increased speed over longer distances
or improved reliability over similar RS-232 setups.
Signal Path
In RS-232, RS-422, and RS-485 operation modes Serial Port 3 signals are only
available through the J5 cPCI I/O connector.
Related Jumpers
W8 & W9 to connect/disconnect
RS-422/RS-485 termination resistors (see Section 3.1, Setting Jumpers)
BIOS Settings
11.3.7 Integrated Peripherals: Onboard Serial Port 3; Serial Port 3 Mode.
Upon a power-up or reset, the Serial Port 3 interface circuits are automatically configured for
the operation mode setup in the BIOS. The Serial Port 3 signal assignation on the J5 cPCI I/O
connector depends on the operation mode (RS-232, RS-422, or RS-485) it has been set.
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