BT2-7 Building Transceiver BT2-7 Building Transceivers provide narrowband radio signaling of alarm and trouble conditions from local fire alarm control systems to the D-700 radio alarm receiving system. Local control panels or supervisory devices that have isolated dry contacts which provide a short for an alarm condition and an open for a trouble condition may be connected directly to the BT2 zone inputs. Interfacing relays may be used to connect other types of outputs. Provides FCC Certified FSK encoded narrowband radio transmission of alarms, troubles and restorations for four zones, expandable up to sixteen zones Expansion modules may be located up to two miles from the BT2-7 Communication with the D-700 is supervised and status changes are reported by automatic and manual poll/reply/acknowledge routines 4 watts RF output power (Selected frequencies available with 2 watts RF output power) Microprocessor controlled Includes programmed diagnostic tests LEDs identify BT2 and zone status; defeatable audible alert sounds for alarm and troubles Integral battery disconnect circuitry prevents battery damage due to prolonged discharge Current status is stored in a nonvolatile, transferrable data module Battery fault (low or disconnected battery or abnormal charger output), ac fail and enclosure tamper (optional) conditions and restorations reported with the BT2 number; ac fail reporting may be inhibited