National Instruments PCI-232/2 Isolated 用户手册

Using PCI Serial with Linux

linux# ./rs485 <

transmit port number> 0

linux# ./rs485 <

receive port number> 0

linux# ./serialtest <

receive port number> <transmit port

number>

What do I do if my ports are not communicating correctly and print
strange characters?

Make sure the baud rate, character size, clock speed (if PCI-485) and parity
are the same for both the receiver and transmitter. Also make sure the
transceiver modes (PCI-485) have been selected for both transceivers.

How can I use

/dev/ttyS0

/dev/ttyS1

/dev/ttyS2

, or

/dev/ttyS3

as National Instruments serial ports?

Check for available serial devices by entering the following:

linux#

setserial -gv /dev/ttyS*

/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3

/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4

/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3

Devices labeled with

UART: unknown

are available for use. To designate

the available device when using

setserial

, enter the following:

linux#

setserial /dev/ttyS<

port number> uart 16550a

port 0x<

port address> irq <irq> ^fourport

Assign Driver

Use these instructions to automatically assign the driver at startup using

/etc/rc.d/rc.serial

You should not change the

/etc/rc.d/rc.serial

file until you have

your serial interfaces installed and configured. If you add another device or
interface to your computer, and your

lspci

output changes, make sure you

also change

/etc/rc.d/rc.serial

Depending on your Linux distribution, you might not have an

/etc/rc.d/

directory. In this case, your

rc.serial

would be located under

/etc/rc.serial

. If you do not have

/etc/rc.d/

, replace the references

/etc/rc.d/

with

/etc/

. If you are using a Debian distribution, replace

the references to

/etc/rc.d/rc.serial

with

/etc/rc.boot/0setserial