Q:  How do I install Linux driver for PL-2303? 
  
A:  This FAQ assumes that you already have the PL-2303 Linux driver source and also know how to compile it in Linux. So this FAQ will only explain how to link the device with our driver. 

(1) In Makefile file, we have set a command to insert driver into Kernel, type "make inst" to insert driver.

(2) After that, type "dmesg" command then click enter.

(3) You will see messages appearing on the screen:
"usbserial.cˇ¨Prolific USB Serial Adapter converter now attached to ttyUSB0 (orusb/tts/0 for devfs)".

This means the virtual COM port is in ttyUSB0, so if you want to use this port, you need to use "ln" command to hard link with the device. 

For example: 
You are using PL-2303 to connect with modem. So you need to type 'ln -b /dev/ttyUSB0 /dev/modem' then click enter. If nothing happens and the screen appears as '[root@localhost / xxxxx]#', the link operation is successful. Please make sure that the modem has been properly installed in system.

Now the modem will use the PL-2303 port to do communication, you can try to use minicom (Red Hat 7.1) AP to test.
