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<== Date ==> <== Thread ==>
Subject: RE: problems in running application(ASYN)
From: "Denison, PN \(Peter\)" <[email protected]>
To: "zhangdemin99" <[email protected]>, "tech-talk" <[email protected]>
Date: Wed, 6 Jun 2007 15:00:24 +0100
Title: Message
You need to sort out permissions on /dev/ttyS0. Typically it'll be writable only by root and members of a certain group, though which one depends on the Linux distribution, usually "uucp", or "dialout" or similar.
 
$ ls -l /dev/ttyS0
crw-rw----  1 root uucp 4, 64 Jun  6 10:03 /dev/ttyS0
 
So you have 2 choices. Have your user added to the uucp (or whatever's appropriate) group, and don't forget to log off and on before trying it. Or, change the permissions on /dev/ttyS0 so that everyone can write to it (chmod 666 /dev/ttyS0).
 
Which one you choose will depend on the role of the machine and any security concerns. The first is safer, but takes more management.

--
Peter Denison, Senior Software Engineer
Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus
Didcot, Oxon, OX11 0DE
Tel: +44 1235 778511


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of zhangdemin99
Sent: 06 June 2007 03:19
To: tech-talk
Subject: problems in running application(ASYN)

Dear all,
  I have built ASYN on my computer, but there are some problems when running application. It said: \dev/ttyS0 can't open Permission denied
  Should I open the serial port in the Linux first or  is there  another problems? what should I do next?
 
many thanks in advance.
 
                                     demin zhang
 
 
 
 
 


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