javax.comm for /dev/ttyS* IO errors

[tomax26]

hi

i install jdk1.6.0_18 and javax.comm 3 for linux in my asusEEE.
i can compile all java source, i can detect serial ports, but when i try open serial port (ttyS0 or ttyS1), i have this error:

Exception in thread "main" java.lang.RuntimeException:
Error opening "/dev/ttyS1"
tcgetattr(): Input/output error
at com.sun.comm.LinuxDriver.getCommPort(LinuxDriver.j ava:66)
at javax.comm.CommPortIdentifier.open(CommPortIdentif ier.java:369)
...

i create source in c to open serial port, but when i try launch my compiled file, i have this same error (about IO error)

i logged as root

i think it's linux ports permission problem or...

maybe sameone has this problem and can help my

p.s. sorry, my english is bad

[Rubberman]

First of all, put a try/catch block around your code when you open the port in order to determine more precisely why this is happening. In any case, it's possible that you don't have permission to open the COM port as a normal user, or the options you used to open the port are invalid.

[hacho]

Are you sure you have a physical serial port? Most laptops nowadays do not have one.
If you are using a USB-to-serial adapter, the device name is /dev/ttyUSB0, not /dev/ttyS0

For USB converters you should be able to see the available devices in /dev

ls -l /dev/ttyUSB*

When a device is pluged in the name is there, when you unplug it, it disappears