Looking at the link i referenced earlier, it looks like they are sending raw data to the device:
Emergency
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0x7 0x1 0x0 0x0'},1)
Fire
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0xA 0x2 0x0 0x0'},1)
Ambulance
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0xA 0x3 0x0 0x0'},1)
Police
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0xA 0x1 0x0 0x0'},1)
Door Chime
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0x6 0x16 0x0 0x0'},1)
Beep Beep
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x71 0x5 0x0 0x0 0x0 0x0 0xA 0x5 0x0 0x0'},1)
To stop the sound you can also send the simpler "Switch Binary" Command Class message below:
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='13',Data='0x25 0x1 0x0'},1)
If that is the case, what is the method of sending raw data in Homegenie?