Symbol USB COM Port Emulation LINUX

I development application under Ubuntu 14.04. Such application require to use bar code scanner and also distinguish the input from scanner or keyboard.

I connect the LI4278 bar code scanner to PC USB port and set to use simple com port emulation mode in scanner. But the scanner locate in system device at  /dev/usb/hidev2 (not /dev/ttyUSBx ).

Please help to give more instruction for how to use the simple com port emulation mode for bar code scanner in Linux.