I am not able to use a FireWire device in my Virtual Machine.
Parallels Desktop (v9 and v10) supports only storage devices (Thunderbolt and FireWire), i.e. external hard drives - are supported.
Parallels Desktop (v9 and v10) for Mac does not provide support for non-storage FireWire devices, i.e. scanners, printers, video/sound cards, etc. - are not supported.
Thunderbolt and FireWire devices are not supported by Parallels Desktop 8 and earlier.