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BDM-610000069
Rev A
Chapter 3: Connecting the cpuModule
33
Serial Port 1 (CN7) and Serial Port 2 (CN8)
Serial Port 1 (COM1) is implemented on connector
CN7
, and Serial Port 2 is implemented on connector
CN8
.
The serial ports are normally configured as PC compatible full-duplex RS-232 ports, but you may use the BIOS
Setup program to reconfigure these ports as half-duplex RS-422 or full-duplex RS-422 or RS-485. If you
reconfigure the ports, you must also select the I/O address and corresponding interrupt using Setup. Table 15
provides the standard I/O addresses and corresponding interrupts.
Serial Port UART
The serial ports are implemented with a 16550-compatible UART (Universal Asynchronous Receiver/
Transmitter). This UART is capable of baud rates up to 115.2 kbaud in 16450 and 16550A compatible mode, and
includes a 16-byte FIFO. Refer to any standard PC-AT hardware reference for the register map of the UART. For
more information about programming UARTs, refer to Appendix D.
RS-232 Serial Port (Default)
The default serial port mode is full-duplex RS-232. With this mode enabled, the serial port connectors must be
connected to RS-232 compatible devices. Table 16 provides the serial port connector pinout and shows how to
connect to an external DB-25 or DB-9 compatible serial connector.
Table 15
Serial Port Settings
I/O Address (hex)
IRQ
03F8
IRQ4
02F8
IRQ3
03E8
IRQ4
02E8
IRQ3
Table 16
Serial Port in RS-232 Mode
Pin
Signal
Function
In/Out
DB-25
DB-9
1
DCD
Data Carrier Detect
in
8
1
2
DSR
Data Set Ready
in
6
6
3
RXD
Receive Data
in
3
2
4
RTS
Request To Send
out
4
7
5
TXD
Transmit Data
out
2
3
6
CTS
Clear To Send
in
5
8
7
DTR
Data Terminal Ready
out
20
4
8
RI
Ring Indicate
in
22
9
9,10
GND
Signal Ground
—
7
5
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