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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 J3 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 J3 CPCI
I/O connector depends on the operation mode (RS-232, RS-422, or RS-485) it has been set:
Pin Number (J3)
A11
C11
D11
E11
A12
B12
C12
E12
2.9.3.1. Infrared Mode:
Infrared (IR) interface signals are provided to drive IR module for remote operations through
Serial Port 3. When set in IR mode, the IR interface supports multi-protocol infrared
operations. The IR interface is IrDA 1.1 compliant, and supports TEMIC/HP modules,
SHARP ASK IR, and consumer IR.
RS-232
/JDCD2
/DCD
JRXD2
RX(-)
/JDSR2
DSR
JTXD2
TX(-)
/JRTS2
RX(+)
/JCTS2
TX(+)
/JRI2
/RI
/JDTR2
/DTR
2.11
RS-422
RS-485
/DCD
RX/TX(-)
DSR
-
RX/TX(+)
-
/RI
/DTR
Onboard Features
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