# Start a flow with input from another system (Modbus)?
**URL:** https://discourse.nodered.org/t/start-a-flow-with-input-from-another-system-modbus/65143
**Category:** General
**Created:** [15 July 2022 12:29 UTC](https://discourse.nodered.org/t/start-a-flow-with-input-from-another-system-modbus/65143 "2022-07-15T12:29:45Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@FSHelgeland](https://discourse.nodered.org/u/FSHelgeland)
#### Post date: [15 July 2022 12:29 UTC](https://discourse.nodered.org/t/start-a-flow-with-input-from-another-system-modbus/65143/1 "2022-07-15T12:29:45Z")
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),
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### Author:  [@FSHelgeland](https://discourse.nodered.org/u/FSHelgeland)
#### Post date: [15 July 2022 22:31 UTC](https://discourse.nodered.org/t/start-a-flow-with-input-from-another-system-modbus/65143/2 "2022-07-15T22:31:19Z")
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,
mbex($Hus:NODERED:Socket$,$Hus:WorkingVariabelNodeRed:Memory$,6,1007),
So yes it is possible, and yes now its working.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [29 July 2022 22:32 UTC](https://discourse.nodered.org/t/start-a-flow-with-input-from-another-system-modbus/65143/3 "2022-07-29T22:32:19Z")
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