printing via serial to usb cable

[Wade Smart]

Rashkae wrote:
> Wade Smart wrote:
>> 20090128 0906 GMT-5
>>
>> I recently posted about my parallel to usb cable causing lots of 
>> problems on my system - and since I received no help there I decided to 
>> try something else.
>>
>> I borrowed a serial to usb cable. I was able to print a test page by:
>> sudo echo "Printer Test" > /dev/ttyUSB0
>>
>> but I havent been able to print any other way.
>>
>> In cups I changed the uri to usb://dev/ttyUSB0 and then I ran the 
>> configure script but nothing changed.
>>
>> What else can I try?
>>
>> Wade
>>
> 
> Try a serial URI
> 
> ex: serial:/dev/ttyUSB0?baud=11500
> 
> Also note: I think (without being absolutely certain) that you only use
> 1 / when you refer to a file (or a device note) directly on your system,
> use // when your are specifying a network resource.  I don't know if
> that matters or if CUPS is smart enough to figure that out on it's own.
>  ( // also seems to be used by USB printers that are named by their
> model number rather than a device note, for examply, in my system, I
> have usb://Samsung/ML-1740  compared to parallel:/dev/lp0)
> 

20090128 1007 GMT-5

Okay... LaserJet4050 (Default Printer) "Unable to open device file 
"/dev/ttyUSB0": Permission denied"

And in my logs:
Jan 28 10:05:42 wadesmart kernel: [145933.655140] 
audit(1233158742.764:27): type=1503 operation="inode_permission" 
requested_mask="rw::" denied_mask="rw::" name="/dev/ttyUSB0" pid=28751 
profile="/usr/sbin/cupsd" namespace="default"

Jan 28 10:05:43 wadesmart kernel: [145934.058182] 
audit(1233158743.168:28): type=1503 operation="inode_permission" 
requested_mask="::rw" denied_mask="::rw" name="/dev/tty" pid=28757 
profile="/usr/sbin/cupsd" namespace="default"

Jan 28 10:06:26 wadesmart kernel: [145977.419281] 
audit(1233158786.616:29): type=1503 operation="inode_permission" 
requested_mask="rw::" denied_mask="rw::" name="/dev/ttyUSB0" pid=28801 
profile="/usr/sbin/cupsd" namespace="default"

Jan 28 10:06:27 wadesmart kernel: [145977.820661] 
audit(1233158787.020:30): type=1503 operation="inode_permission" 
requested_mask="::rw" denied_mask="::rw" name="/dev/tty" pid=28808 
profile="/usr/sbin/cupsd" namespace="default"

Wade
-- 
Registered Linux User: #480675
Linux since June 2005