Hi @tinman,
If this is on Vera, yes, you should be able to send raw Zwave data with the specific command class and command with a simple luup call
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='56', Data='112 4 3 1 2'}, 1)
The structure of the Data key calls for the command class either in hex or dec format and the data holders that the command class supports. For instance, turning on device 50 with command class 0x20 BASIC_SET, would look like
luup.call_action('urn:micasaverde-com:serviceId:ZWaveNetwork1','SendData',{Node='50', Data='x20 1 xFF'}, 1)
As always, the Zwave command class reference comes in handy.