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Using PCI Serial with Linux 12 www.natinst.com

Troubleshooting and Common Questions

Error Codes

This section lists possible error codes and solutions.

Error Code /dev/ttyS<

port number

>: no such file or directory

Solution The /dev/ttyS<

port number

> does not exist in the /dev directory. Enter the

following to create the device:

linux# cd /dev

linux /dev# ./MAKEDEV ttyS<

port number

Error Code Couldn't change i/o privilege level: Operation not permitted

Solution The program requires superuser privileges. Either exit and log in as root, or enter

the following:

linux$ su

Password: <

enter the root password

linux# <

run the program

Error Code setserial: Cannot set serial info: Address already in use

Solution Make sure you are entering the correct port address into setserial. Also, make

sure you are entering

0x if you are specifying a hex number.

linux# setserial /dev/ttyS<

port number

> uart 16550a port

0x<

port address

> irq <

irq

> ^fourport

Error Code intenable: Can't open /dev/mem: Permission denied

Solution The program requires superuser privileges. Either exit and log in as root, or enter

the following:

linux$ su

Password: <

enter the root password

linux# ./intenable <

PCI memory

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National Instruments PCI-232/4 Manual de usuario Pagina 12