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Fire Alarm Cut Off
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<blockquote data-quote="Brian Bolly" data-source="post: 92591" data-attributes="member: 32"><p>Re: Fire Alarm Cut Off</p><p></p><p>Does your municipality dictate that the PA system be muted, or powered off? Does this include the monitor system as well? Generally the answer is 'no', but I have seen stranger things. Once you have these answers, this will dictate which solution will work best for you.</p><p></p><p>There are commercial products that can facilitate such contact closures. A multi-pole relay as Mac mentioned might work on the line level side, but I'm guessing it needs to be automatically triggered from fire command. Depending on your DSP, you may have GPIO ports that can be used to control various mute states. If you have to take a contact closure from a fire alarm system, be sure to check the voltage they send down the line from fire command - you may need a transformer. You mentioned that your DSP is locked down - does it even accept contact closures? If it is a newer system (warranty?), this could be cause for the contractor to come back and unlock the DSP to add functionality if it is part of life safety. Even if it is out of warranty, adding a mute state into a programming shouldn't take all that long - maybe the least expensive and most convenient option is a service call.</p></blockquote><p></p>
[QUOTE="Brian Bolly, post: 92591, member: 32"] Re: Fire Alarm Cut Off Does your municipality dictate that the PA system be muted, or powered off? Does this include the monitor system as well? Generally the answer is 'no', but I have seen stranger things. Once you have these answers, this will dictate which solution will work best for you. There are commercial products that can facilitate such contact closures. A multi-pole relay as Mac mentioned might work on the line level side, but I'm guessing it needs to be automatically triggered from fire command. Depending on your DSP, you may have GPIO ports that can be used to control various mute states. If you have to take a contact closure from a fire alarm system, be sure to check the voltage they send down the line from fire command - you may need a transformer. You mentioned that your DSP is locked down - does it even accept contact closures? If it is a newer system (warranty?), this could be cause for the contractor to come back and unlock the DSP to add functionality if it is part of life safety. Even if it is out of warranty, adding a mute state into a programming shouldn't take all that long - maybe the least expensive and most convenient option is a service call. [/QUOTE]
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