The XP95 Sounder VAD Base is a loop-powered sounder and EN 54-23 approved VAD combined with a standard intelligent mounting base. It is used to signal a fire alarm in enclosed areas.

Electrical Description

The Sounder VAD Base is loop-powered so needs no external power supply. It operates at 17–28V DC and is polarity-sensitive.

Mechanical Construction

The Sounder VAD Base is moulded in polycarbonate and has stainless steel contacts that accept solid or stranded cables of up to 2.5mm².

Device Addressing

The XP95 Sounder VAD Base responds to its own individual address set with a DIL switch. It also responds both to a group address, set by means of a 4-segment DIL switch and to a synchronisation address which is embedded in the unit.

Addresses 1 to 111 are used exclusively for individual addresses; addresses 112 to 126 are used for group addressing. Any Sounder VAD Bases on a loop may be freely assigned to a group. The address for any group must be chosen from the range 112–126.

Addresses 112–126 may be used as individual addresses but only if the 4-segment DIL switch is not used ie, group addressing is disabled.

If the 4-segment DIL switch were set to any number other than the default 127, a pre-set analogue value of 4 would be transmitted to indicate a fault.

The XP95 Sounder VAD Bases are normally polled by the individual address. If more than one Sounder VAD Base is activated it is possible for the sounders to be synchronised with each other.