Abstract: Building monitoring and control systems including bi-directional radio frequency links between master and remote units wherein the remote units operate in a low power, non-receiving state a majority of the time is disclosed. The bi-directional capability allows coordinated scheduling which aids in allowing the remote units to transmit data only at periodic time intervals to extend battery life. The bi-directional capabilities also allow for re-read requests for alarm validation and for putting remote units in armed and disarmed states for power conservation.

Abstract: Building monitoring and control systems including bi-directional radio frequency links between master and remote units wherein the remote units operate in a low power, non-receiving state a majority of the time is disclosed. The bi-directional capability allows coordinated scheduling which aids in allowing the remote units to transmit data only at periodic time intervals to extend battery life. The bi-directional capabilities also allow for re-read requests for alarm validation and for putting remote units in armed and disarmed states for power conservation.

Abstract: Building monitoring and control systems including bi-directional radio frequency links between master and remote units wherein the remote units operate in a low power, non-receiving state a majority of the time is disclosed. The bi-directional capability allows coordinated scheduling which aids in allowing the remote units to transmit data only at periodic time intervals to extend battery life. The bi-directional capabilities also allow for re-read requests for alarm validation and for putting remote units in armed and disarmed states for power conservation.

Abstract: A computer apparatus includes a computer processing unit including a processor device for operating upon data and providing data for display. The apparatus further includes a handheld input/output display unit. The display unit includes a housing sized to be grasped by a user's hand. A computer display is located within the housing at a position to allow the user to view the computer display through an eyepiece. A display driver is used for presenting data from the processing unit on the computer display. Navigational input tools are integrated with the computer display in the housing and operatively connected to provide user input to the processing unit. The navigational input tools are positioned for operation by one or more fingers of the user's grasping hand. The computer processing unit may be integrated within the housing of the handheld input/output display unit. The navigational input tools may include a mouse having a force actuated pointer and at least one button, e.g.

Abstract: A building monitoring system is disclosed that includes a bi-directional radio link between a master and a number of remote units, wherein the master unit schedules the transmission times of the remote units to avoid collisions.

Abstract: A building monitoring and control system is disclosed that includes a bi-directional radio link between master and remote units, wherein the remote units adjust transmission power to a level adequate for communication but not so high as to waste power and unnecessarily decrease battery life. In one embodiment, the master unit measures a received signal strength from the remote units and uses that measure to provide feedback to the remote units as to whether their transmissions are too strong, too weak, or within an acceptable range. In another embodiment, the remote units receive an analog measure of the master unit received signal strength and use that measure as an indication of whether to increase or decrease the transmission strength. In yet another embodiment, the lack of an acknowledgement from the master is used as an indication that the remote signal is not strong enough.

Abstract: A differential gyrator based filter is disclosed that preferably has a first gyrator connected to the positive input signal of the differential input signal and a second gyrator connected to the negative input signal of the differential input signal. A load capacitor is connected between the load terminals of the first gyrator and second gyrator, which minimizes the total load capacitance required for the gyrator based filter. This implementation is believed to increase the overall density, reliability, yield, signal-to-noise ratio and dynamic range of the gyrator based filter and related circuitry.

Abstract: A display apparatus for displaying video information received from a plurality of memory devices. Each memory device is organized as 2.sup.x rows by 2.sup.y columns of memory locations and a plurality of bits deep, where x and y are integers. The display apparatus includes a display having a plurality of display devices wherein each display device includes a plurality of pixels. The plurality of pixels of at least one of the display devices is organized as 2.sup.n rows by 2.sup.m columns of pixels as a function of the memory device organization, where n and m are integers. The display apparatus further includes apparatus for receiving the video information from the plurality of memory devices and driving at least a portion of the plurality of pixels of each display device in parallel.