1.0 Introduction
Two-Card-Rule is an advanced access control feature supported on NXT-MSC and Mercury SCP controllers. When configured, the door will not open until a valid card has been presented by two different cardholders. This ensures that a minimum of two separate cardholders are required for access at all times. After the first cardholder presents their card, there is a time window of approximately 15 seconds in which the second card must also be presented at the same reader.
2.0 Setup Procedure
- Go to Setup >> Hardware Setup >> All to display the hardware tree.
- Expand a controller and click on the reader you wish to apply Two-Card Rule setting.

- In the Reader Mode ribbon bar click on the Enable Two Card icon.

- The reader will immediately be put into this mode (as indicated in Live Events).

- Present a valid card to the reader, the reader will beep twice and the LED will flash green three times.
- You will then have 15 seconds in which to present a second valid card.
- If a second card is presented within 15 seconds the door will then unlock and in live events you will see: 'Access Granted'.
- If a second card is not presented within 15 seconds then the door will not unlock and an Access Denied - No Second Card message will appear in Live Events.
- You can click the Disable Card Rule icon in the ribbon bar at any time to put the reader back to requiring just one valid card read.