Table 1 - Response characteristics of smoke and heat detectors.
4 Protocol Features:
Control Unit Interrogation and Command: 3 bits of command instruction and the 7- bit address are issued
by the control equipment following an initiating pulse.
Interrupt Warning: Notification that an XP95 manual call point or XP95 Mini Switch Monitor (interrupt) has
been operated.
Analogue Value Report: Status continually reported.
Input Bits Reporting: Field devices advise control equipment of actions they have taken. For smoke and
temperature detectors, these confirm compliance with the output command bits. Bit information depends on
device type.
Automatic Type Identification: The device being interrogated replies with a 5 bit type code, allowing up to
32 device types.
Address Confirmation: The 7- bit address (up to 126 devices per loop) of the detector responding is
confirmed back to the control unit.
XP95 Device Flag: Tells the control equipment that more information is available.
Alarm Flag: For accelerated alarm reporting.
Parity Error Check: For received message accuracy.
Interrupt or Alarm Address: Provides fast location of a device in alarm state.
High Level Integration: ASICs technology for lower component count.
Zero Insertion Force Base: For easier installation and maintenance.
Ease of Maintenance: Snap lock chambers for easy cleaning.
Surface Mounted Components: For long life and high reliability
Latest Data Reported: As well as free running data update, device will update data when the preceding
device is being interrogated.
XPERT Card Addressing: For fast reliable installation and service.
Unobtrusive Design: For elegant designs in modern buildings.
Ionisation Optical Multisensor Heat
Overheating/thermal
combustion
Poor Very Good Very Good Very Poor
Smouldering/glowing
combustion
Moderate/Good Good Good Very Poor
Flaming combustion
Very Good Good Good Poor
Flaming with high
heat output
Very Good Good Very Good Moderate/Good
Flaming-clean
burning
Poor Very Poor Moderate/Good Moderate/Good
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