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 17 provides the available I/O addresses and corresponding interrupts.

Table 17 Serial Port Settings

I/O Address (hex)

IRQ

 

 

03F8

IRQ4

 

 

02F8

IRQ3

 

 

03E8

IRQ4

 

 

02E8

IRQ3

 

 

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 18 provides the serial port connector pinout and shows how to connect to an external DB-25 or DB-9 compatible serial connector.

Table 18 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

 

 

 

 

 

 

BDM-610000049 Rev G

Chapter 3: Connecting the cpuModule 37

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IBM BDM-610000049 user manual Serial Port 1 CN7 and Serial Port 2 CN8, Serial Port Uart, RS-232 Serial Port Default

BDM-610000049 specifications

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