# How to use the SW emergency button / kill switch / cut off

Add the emergency button / kill switch (Normally Closed, NC) to J21 pin 6 and pin 8 (GND) like in the picture below.

In the SW, please configure it to be an emergency button with: “bms set emergency-button-enable 1”.

This will enable the pull-up resistor on MCU pin PTE8. When the emergency button is pressed, the connection to ground is broken and the pin will be high. This will generate a SW emergency stop and the BMS state machine will go to the FAULT state.

<figure><img src="https://4197583498-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4sYITYOw8lqjlbpxfe9d%2Fuploads%2FSdaOhfIzjHBTvIMcxU5k%2Fimage.png?alt=media&#x26;token=e2a727eb-572f-4d3d-93e8-1e3c467ba170" alt=""><figcaption></figcaption></figure>


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