To initiate a shutdown press and hold the Shutdown button on the enclosure. When the controller detects that the Shutdown button is being pressed, it enters the shutdown mode. This is indicated by the Backup LED flashing the alert mode pattern (On 100-mS, Off 100-mS). 

To verify the Shutdown button is functioning and not in a failed state, the controller must detect the button release before proceeding. Once the button is released, the controller puts the software in a safe state. During this process, the Backup LED toggles with the work pattern (On 1-Second, Off 1-Second). Once the software has successfully completed its process, it notifies the controller that it is safe to shutdown. The controller turns off the Backup LED indicating it is safe to remove power.

In the event that the software is unable to put the system into a safe state, the software notifies the controller that it could not complete the request. The controller then indicates this by toggling the Backup LED with the error pattern (On 200-mS, Off 200-mS, On 200 mS, Off 3-Seconds).