Multi-access modes: supports card only; card or PIN; or card with PIN and multiple cards/PINs for flexible access control. Master card function: includes a master card option for administrative access control. Compatibility and connectivity: - Works with any reader that uses Wiegand 26-37-bit input. - Also connects to keyboard readers with 4-bit, 8-bit (ASCII) or 10-bit interfaces. What this solves: - Enables scalable access control with single or multiple credentials. - Provides administrative capability via a master card for higher-level permissions. 2-3 practical use scenarios: - Small office door entry: employees use a card or card+PIN; management can use a master card for overrides or temporary access. - Residential building: residents receive cards; property management can issue a master card to authorized personnel for building maintenance or guest access. - Integrated security zones: combine with existing Wiegand or keypad readers to secure restricted areas such as server rooms or labs. Key performance points: - Broad compatibility across common Wiegand and keyboard reader interfaces. - Flexible credential options to suit various security requirements. - Simple integration with existing access control infrastructure while maintaining reliable operation.