Simplexgrinnell LP

Adt Services Ag

Gary W Vincent

Kenneth Savage, Jr

Mark Philias Barrieau

Joseph D Farley

Brian A Rusiecki

Johnpaul P Barrieau

Joseph Piccolo, Iii

Richard P Bonneau

Juan Antonio Martinez

Daniel Laramie

A fire alarm network fiber optic multiplex modem includes plural local interfaces, a fiber optic interface, a multiplexor, a fiber optic modem, and a demultiplexor. The multiplexor combines data received at the local interfaces into an outgoing data stream. The fiber optic modem transmits, at a first wavelength, the outgoing data stream to the fiber optic interface and receives, at a second wavelength, an incoming data stream via the fiber optic interface. The demultiplexor separates the incoming data stream into separate data streams, and forwards each of the separate data streams to its corresponding local interface.

Fiber optic multiplex modem

A monitoring system for a NAC (Notification Appliance Circuit) is provided. The monitoring system includes a system controller, and a NAC comprised of one or more notification appliances that may be in a series. The NAC and its appliances may be operatively coupled to the system controller. The system controller is operable to determine whether a notification appliance has sufficient voltage at a low voltage operation. The system controller may control the voltage to the NAC in order to provide power to simulate operation of the NAC using battery power. A voltage may be measured during the simulation (such as at one end of the NAC). The measured voltage may be compared with a predetermined minimum operating voltage for the notification appliance. Based on the comparison, it may be determined whether the one or more appliances on the NAC may operate properly when the NAC is operated using battery power.

System for testing NAC operability using reduced operating voltage

An alarm system notification device includes a strobe, a communication port, a manual selector that allows manual selection of strobe intensity, and a communication port through which the device transmits an indication of a selected strobe intensity. The device may also include a commandable selector that selects a strobe intensity in response to a command received from the communication port.

Programmable multicandela notification device

Jumper and ground faults are detected within an alarm system. Jumper detection applies to devices having two or more functions (e.g., audible horn and visual strobe). When operated with a single circuit, jumpers typically remain installed in such devices to provide power to all functions. However, if the devices are installed in alarm systems equipped with multiple functions, the jumpers should be removed to allow functions to operate independently and correctly. To detect unremoved jumpers, all loops to separate functions except one are isolated. After isolation, a predetermined signal is presented to the non-isolated loop and current is compared to a reference value. If jumpers exist between this non-isolated loop and another supposedly isolated loop, the additional parallel resistance produces an abnormal signal. To perform ground fault detection, lines of devices may be sequentially isolated (i.e., disconnected) at the control panel via software control until a previously detected ground fault disappears. The line that is isolated and which causes the fault to disappear is the line containing the fault.

Method and apparatus for determining proper installation of alarm devices

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Lunenburg, MA, United States of America

Gary W Vincent