Mullion entry readers support proximity cards, smart credentials, and mobile devices through technologies such as 125 kHz proximity, 13.56 MHz high-frequency credentials, and Bluetooth Low Energy. Keypad-equipped models add PIN access and may combine a PIN with a card or mobile credential for two-factor entry.

When choosing between Wiegand and Open Supervised Device Protocol (OSDP) mullion entry readers, consider the access controller, existing wiring, credential technology, and whether the installation calls for traditional connectivity or a newer communication method. Wiegand readers can fit established systems, while OSDP readers support secure communication and, on compatible systems, multi-drop wiring that can simplify reader connections.

Review the narrow door frame for available mounting space, reader orientation, cable routing, and clearance for the door and hardware before installation. Confirm that the reader’s connection type, such as Wiegand or OSDP, matches the access control system, and select a model with suitable credential support and environmental protection for the location.

Choose a ruggedized or weather-resistant mullion entry reader for exposed entrances, outdoor installations, or high-traffic indoor doors that may encounter dust, rain, or physical damage. Select a proximity model for credential-only access, or a mullion keypad reader when users may enter a PIN, use credentials, or provide both for two-factor authentication.