Abstract: A method for access control of premises having a plurality of units includes receiving a selection of one or more units of the plurality of units associated with the premises from a first user via a primary interface device communicatively coupled to a network. The method also includes sending a call to one or more secondary interface devices based on the selection. The one or more secondary interface devices can be located in the one or more selected units. Further, the method includes monitoring for a trigger condition after the call is sent to the secondary interface device. Upon occurrence of the trigger condition, the method also includes forwarding, via the primary interface device, the call to a mobile device of a second user associated with the one or more units.

Abstract: A method for access control of premises having a plurality of units includes receiving a selection of one or more units of the plurality of units associated with the premises from a first user via a primary interface device communicatively coupled to a network. The method also includes sending a call to one or more secondary interface devices based on the selection. The one or more secondary interface devices can be located in the one or more selected units. Further, the method includes monitoring for a trigger condition after the call is sent to the secondary interface device. Upon occurrence of the trigger condition, the method also includes forwarding, via the primary interface device, the call to a mobile device of a second user associated with the one or more units.

Abstract: A solid-state magnet control includes a housing and magnet control circuitry mounted within the housing. The magnet control circuitry includes an insulated gate bipolar transistor (IGBT) bridge configuration and DUMP circuitry. The DUMP circuitry inhibits circuit damage to the magnet control circuitry and other components contained within the magnet control caused by overvoltage and/or voltage transients. The magnet control circuitry controls current passing through the magnet. The IGBT bridge configuration includes a LIFT HIGH IGBT, a LIFT LOW IGBT, a CLEAN HIGH IGBT, and a CLEAN LOW IGBT, as well as a capacitor bank. The DUMP circuitry includes a DUMP HIGH IGBT, a discharge diode, and a discharge resistor. The magnet control is configured to provide power loss ride through, ground fault detection, and discharge voltage control, and can accept increased voltage supply to reduce charge-up time of the magnet, and existing operator control inputs through a relay interface.