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PL-2303 serial adapter, cu and Snow Leopard

April 25th, 2010 · 5 Comments · Uncategorized

I am using a PL-2303 USB-to-serial adapter when connecting to serial interfaces.

After having installed Snow Leopard and reinstalled the Prolific PL-2303 driver (32-bit version from prolific), I found myself prevented from lauching cu to connect to the serial port:

elasticsheep:~ mathieu$ cu -s 9600 -l /dev/cu.usbserial 
cu: creat during lock (/var/spool/uucp/TMP00000000c8 in /dev as uid 501): Permission denied
cu: /dev/cu.usbserial: Line in use

It appears that permissions have changed from Leopard and I am now not allowed to execute cu as a simple user (as mentionned here).

The solution is to use sudo to launch cu:

elasticsheep:~ mathieu$ sudo cu -s 9600 -l /dev/cu.usbserial 
Password:
Connected.

Problem solved.

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