Differences between having Mercury host decision handoff enabled and disabled

2024-01-22Last updated

Your access control system behaves differently depending on whether the Mercury host decision handoff feature is enabled or disabled.

You can enable or disable Mercury host decision handoff from the Synergis™ Appliance Portal. Navigate to Configuration > Mercury controller settings > Door settings , and then configure the Disable host decision handoff (offline mode) setting. By default, this setting is disabled, meaning that Mercury host decision handoff is enabled, and that the Synergis™ Cloud Link unit makes the access control decisions.

Refer to the following table to know when your access control system behaves differently, depending on whether Mercury host decision handoff is enabled or disabled.

Host decision handoff enabled (default) Host decision handoff disabled
Access control decisions made by Synergis Cloud Link Mercury controller
Card read to door unlock time 0 to 51 seconds Under 1 second
Deleting a cardholder or credential in Security Center
  • Versions earlier than 5.11.3.5
  • 5.12.0.0
Fast Up to 1 hour for changes to propagate
Deleting a cardholder or credential in Security Center
  • 5.11.3.6 or later
  • 5.12.1.0 or later
No difference in behavior
Deactivating a cardholder or credential manually or automatically through its expiration date No difference in behavior
Revoking access by removing a cardholder from a cardholder group or access rule, changing schedules, and so on
Note: Revoking access by deleting or deactivating a cardholder not included.
Fast Up to 1 hour for changes to propagate
Interlock, antipassback, and max occupancy Supported The Mercury native area control option must be enabled.

1 It can take up to 5 seconds, depending on the network conditions.