lsusb 
Bus 001 Device 004: ID 0403:fd49 Future Technology Devices International, Ltd

http://www.linux-usb.org/usb.ids

fd48  ShipModul MiniPlex-4xUSB NMEA Multiplexer
fd49  ShipModul MiniPlex-4xUSB-AIS NMEA Multiplexer

Install its driver:

opkg update
opkg install kmod-usb-serial kmod-usb-serial-ftdi

But since it is not standard FTDI chip.

lsmod |grep  ftdi_sio
rmmod ftdi_sio
lsmod |grep  ftdi_sio
insmod ftdi_sio vendor=0x0403 product=0xfd49
lsmod |grep  ftdi_sio

Put it at start init.

nano /etc/rc.local
...
#reset-mcu
/sbin/rmmod ftdi_sio
/sbin/insmod ftdi_sio vendor=0x0403 product=0xfd49
exit 0