Get serial devices working on Synology DS216+II DiskStation

Thanks again @wborn, your answer solved my problem.

For people who’re having the same problem in the future;

Edit or create the file startup.sh via:

sudo vi /usr/local/etc/rc.d/startup.sh

Put the next text into the file:

sudo insmod /lib/modules/usbserial.ko
sudo insmod /lib/modules/ftdi_sio.ko
sudo chmod 777 /lib/modules/usbserial.ko
sudo chmod 777 /lib/modules/ftdi_sio.ko

Change rights of startup.sh:

chmod 700 /usr/local/etc/rc.d/startup.sh

The next time your NAS reboots, modules will be starten automatically.

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