Apollo Smoke Detector XP95 Guía de usuario descargar pdf (Pagina 4)

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COMMUNICATIONS

Discovery uses a digital communications protocol which has been

developed from the XP95 protocol but which differs in that it allows

communication in three different modes: Normal, Read and Write.

The reason for developing the protocol is that the Discovery range

requires a more extensive exchange of information than previous

analogue addressable ranges. In addition, Discovery can store data

in non-volatile memory.

The Normal mode is identical to the XP95 protocol with the

exception that the five additional analogue value bits in the XP95

protocol extension have been re-defined for use as a mode selection

indicator (four bits) and a drift warning flag. This enables the control

and indicating equipment (CIE) to distinguish between Discovery

and XP95 devices.

The Read mode is used to check information stored in the non-

volatile memory of each detector. It is accessed by using a simple

extension to the Normal mode communication method from the

control and indicating equipment (CIE) to the detector.

In Write mode the CIE is able to write information to the detector by

extending the communication method in the same way as in Read

mode.

The detector does not return its analogue value during Read or Write

modes, but, in the event of the detector calculating an alarm value

during this time, it can use the alarm flag and alarm address

mechanism to alert the CIE to its status.

Discovery detectors are compatible with XP95. It should be noted,

however, that Discovery features will not be available when

Discovery is used with XP95 control panels. Panels with drift

compensation algorithms should disable the algorithms when

communicating with Discovery.

For a full description of the

Discovery protocol, refer to

Apollo publication PP2027,

Discovery Protocol PIN Sheet.

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Apollo Smoke Detector XP95 Guía de usuario Pagina 4