BDM-610000087 Rev A
Chapter 3: Connecting the cpuModule 39
Facing the serial port’s connector pins, the pinout is:
RS-422 or RS-485 Serial Port
You may use the BIOS setup utility to configure the serial ports as RS-422 or RS-485. In this case, you must
connect the serial port to an RS-422 or RS-485 compatible device.
When using RS-422 mode, you can use the serial ports in either half-duplex (two-wire) or full-duplex
(four-wire) configurations.
When using full-duplex in RS-422 mode, connect the ports as shown in Table 13.
In RS-485 mode, the connection of the ports is always half-duplex, as the transceivers’ transmitters are
connected to the receivers internally.
9
7
5
3
1
GND
DTR
TXD
RXD
DCD
GND
RI
CTS
RTS
DSR
10
8
6
4
2
Note
The cpuModule has a 120 Ohm termination resistor. Termination is usually necessary
on all RS-422 receivers and at the ends of the RS-485 bus. Termination resistors can be
enabled in the BIOS setup utility.
Table 13 Full-Duplex Connections
Port 1
Port 2
RXD+
TXD+
TXD+
RXD+
RXD–
TXD–
TXD–
RXD–
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