Start a flow with input from another system (Modbus)?

I was wondering if it is possible to start a Node Red flow when I perform a action in my Home Automation system? I have the possibilty in my system to start a modbus write when performing an action (I belive) I do read values from Node Red through Modbus write nodes. What I was trying to send to Node Red is : mbex($Hus:NODERED:Socket$, 1,6,1067),

Got some help from someone who know my home automation system a bit better than me. Had to do this code: $Hus:WorkingVariabelNodeRed:Memory$ = 1,
So yes it is possible, and yes now its working.

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