Thanks very much for the suggestion Javi. I tried to implement what you had and came up with this for the service call in Home Assistant:
entity_id: switch.zw_002_on_off_power_switch
command: CONFIG
parameters: {"num.uom107":8,"val.uom114":33884690}
Home Assistant won't accept the dict for parameters unless I encase the key names in quotes ""
Based on the UOM values found here: https://wiki.universal-devices.com/index.php?title=ISY_Developers:API:V5:Appendix:Units_of_Measure
Home Assistant however throws this error using "CONFIG" for the command: Failed to call service isy994/send_raw_node_command. Invalid ISY Command. for dictionary value @ data['command']
It accepts the command if I change CONFIG to ST, or DON, DOF, etc, but it just performs the command and ignores the parameters. I found the REST equivalent of what I'm trying to do here: https://wiki.universal-devices.com/index.php?title=ISY_Developers:API:REST_Interface#Commands
This works:
http://x.x.x.x/rest/zwave/node/ZW002_1/config/set/8/33884690/4
Seems like I'll have to figure out or ask if the isy994 integration for Home Assistant supports a "config" command, but at least I can pass the values over REST requests for now.
Thanks again.