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   Ryan Castellucci :nonbinary_flag: (ryanc@infosec.exchange)'s status on Wednesday, 23-Oct-2024 18:29:29 JST Ryan Castellucci :nonbinary_flag:

   Does anyone know how interconnect signaling for fire alarms works?

   Mine have one signal wire plus mains (neutral and live), and I assume it's probably one of:

   (normally floating, active x volts DC)
   (normally neutral, active x volts DC)
   (normally floating, active neutral)

   • Embed this notice
     Rabbit (ra6bit@infosec.exchange)'s status on Wednesday, 23-Oct-2024 20:13:35 JST Rabbit

     in reply to

     @ryanc In the US I believe it is white (neutral), black (hot), red (signal) with Red to black normally floating, alarm signal is notionally+9VDC red to black but 7 to 20VDC in practice. White to black is 120VAC.

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     Ryan Castellucci :nonbinary_flag: (ryanc@infosec.exchange)'s status on Wednesday, 23-Oct-2024 22:43:59 JST Ryan Castellucci :nonbinary_flag:

     in reply to

     • Rabbit

     @ra6bit makes sense. I think I'm going to need to use a meter and then set them off.