National Instruments PCI-232/2 用户手册

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one serial port. To change the baud base of your other serial ports, rerun 

clockspeed

 with a different serial port number specified in the command 

line. Enter the following to set the baud base. (In this example, high equals 
a baud base of 460800 and low equals a baud base of 115200):

linux# setserial /dev/ttyS<

port number> baud_base 115200

linux PCI-SERIAL#./clockspeed <

port number> <"high" or 

"low">

For example, enter the following to select a baud base of 115200 for 

/dev/ttyS4

 and for 

/dev/ttyS5

:

linux# setserial /dev/ttyS4 baud_base 115200

linux# setserial /dev/ttyS5 baud_base 115200

linux PCI-SERIAL# ./clockspeed 4 low

linux PCI-SERIAL# ./clockspeed 5 low

Enter the following to change the baud base back to 460800 for 

/dev/ttyS4

 and for 

/dev/ttyS5

:

linux# setserial /dev/ttyS4 baud_base 460800

linux# setserial /dev/ttyS5 baud_base 460800

linux PCI-SERIAL# ./clockspeed 4 high

linux PCI-SERIAL# ./clockspeed 5 high

After you connect the cables to the port (as shown in your PCI serial getting 
started manual), run the 

serialtest

 program (from the 

PCI-SERIAL

 

directory) to verify your setup. Make sure you specify two different ports 
for the 

serialtest

 program, as shown in the following:

./serialtest <

receive port number> 

<

transmit port number>

If the test is successful, it displays a 

SUCCESS

 message. If the test hangs, 

press <ctrl-c> to exit the program, and continue to the next section, 

To test 

/dev/ttyS4

 and 

/dev/ttyS5

, connect a cable between the 

two ports and enter the following:

linux PCI-SERIAL# ./serialtest 4 5