The Edwards 5540MV Adaptatone® Millennium Central Tone Generator with Voice messaging has been designed for applications where simultaneous signaling of a high decibel , heavy duty signal and pre-recorded voice messaging is required. The tone generator assures a synchronous signaling sound from all remote speakers. The Millennium Central Tone Generator produces the 55 standard Adaptatone® sounds and can store 20 s of field recorded voice messages. Four signals may be activated from field wired, normally open contacts or a 24V DC external voltage source such as an output of a PLC. Normally open contacts can be obtained from the catalog no. 5538-4 or catalog no. 5538-4R Adaptatone® Signal Actuator. Messages and tones may be selected by setting miniature dip switches within the unit. The programmed tones operate on a pyramid type priority system. For more information on priority tone operation and a complete listing of all 55 tones, see Adaptatone® Tone Selection and Priority Operation. The 5540MV-485Y6 is designed to be connected to RS485 networks, allowing full serial signaling communication control. Adaptatone® Signaling Systems are designed for industrial applications calling for high decibel output and microprocessor reliability combined with simultaneous signal delivery over all speakers included in the system. Typical applications include: emergency warning systems, plant evacuation alarms, shift start-and-dismissal horns and paging signals.