# Command a VSD with Node-RED
**URL:** https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661
**Category:** General
**Created:** [18 July 2018 12:56 UTC](https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661 "2018-07-18T12:56:02Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@iridiu](https://discourse.nodered.org/u/iridiu)
#### Post date: [18 July 2018 12:56 UTC](https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661/1 "2018-07-18T12:56:02Z")
Dear members of Node-RED community, I'm a beginner in terms of Node-RED and ModBus protocol, for this reason I can not find a solution to control a variable speed drive from Node-RED via ModBus TCP. The VSD is an Schneider Altivar Process ATV900 series, which is using a command word to start, stop, direction of rotation and speed (Hz, rpm). The communication parameters can be found at this [address](https://www.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/305000/FA305857/en_US/ATV900_Communication_parameters_NHA80944_V1.2.xlsx). Also I found [this mini-tutorial](https://www.schneider-electric.com/en/faqs/FA300078/).
Also I have looked for similar example implementations for controlling a VSD via ModBus TCP, using a command word, but I didn't found something useful.
I hope to find help in the community, to send few commands to the VSD (start, stop, rotation, speed), and a minimal flow example would help me a lot, but also the other members who will want to command a VSD using Node-RED.
Thank you
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### Author:  [@arlinfriesen](https://discourse.nodered.org/u/arlinfriesen)
#### Post date: [20 November 2019 19:41 UTC](https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661/2 "2019-11-20T19:41:31Z")
Were you able to make this work? I'm trying to make a similar application work (also with a Schneider Altivar drive) and don't know where to start.