Hi I’ve also experienced issues with this.
See: /dev/ttyAMA0 does not exist on RasPi2 & OH2
Basically for me it works when using /dev/ttyUSB30 in the configuration of the Z-wave controller:
root@firefly:/dev# ls -l tty*USB*
lrwxrwxrwx 1 root root 7 Sep 5 20:38 ttyUSB30 -> ttyAMA0
root@firefly:/dev# ls -la *ttyAMA0*
crw-rw---- 1 root dialout 204, 64 Sep 9 09:49 ttyAMA0
Where ttyUSB30 is a symbolic link.