Connect an Exit Button inside the room is obviously a convenient method to unlock door when people need to get out.
Go to Intercom - Input to configure input settings.
Input Service: To enable or disable input trigger service.
Trigger Option: To choose open circuit trigger or closed circuit trigger. Low means that connection between door terminal and GND is closed, while high means the connection is opened.
Action to execute: To choose which action to execute after the input terminal is triggered.
Http URL: To configure URL, If HTTP action is chosen.
Open Relay: To configure relay to open.
Door Status: To show the status of input signal.