Security system and method for using an LF activated RFID tag

A method for automatically disarming a security system comprising:

• detecting an open state of a door to be monitored;
• transmitting a low frequency (LF) data packet with a door sensing unit mounted proximate to the door, the door sensing unit interconnected with the security system, the LF data packet comprising at least one of a Door ID associated with the door and a System ID associated with the system;
• receiving the LF data packet with a disarm device;
• discarding the LF data packet when the LF data packet has a frequency that is different than a predetermined frequency or outside of a range of predetermined frequencies, to conserve power in the disarm device, transmitting a disarm data packet with the disarm device when the LF data packet is within the predetermined range of frequencies, the disarm data packet comprising at least one identifier associated with the disarm device;
• and
• disarming the security system when the at least one identifier is associated with an approved disarm device.

A security system, comprising:

• means for detecting open and closed states of a door being monitored by the security system;
• a low frequency (LF) transmitter configured to transmit an LF data packet when the door is detected in the open state;
• a disarm device configured to detect the LF data packet, the disarm device further configured to discard the LF data packet when a frequency of the LF data packet is outside a range of predetermined frequencies, to conserve power in the disarm device, and transmit an RF disarm data packet when the LF data packet is within the predetermined range of frequencies and comprises a first approved identifier (ID);
• and
• means for automatically disarming the security system when the RF disarm data packet comprises a second approval ID.