National Instruments and PCI-485/4 Isolated Manual De Usuario

This section lists possible error codes and solutions.

Error Code

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

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>