Re: PIRs & Sensors dual wiring

["Ian Davidson" <ian@xxxxxxx>]

Hi Mick

 

You can do it but it depends on the alarm and type of i/p to your ha system. At my old house I ran a multicore cable from the alarm panel to the HA PC which had a digital i/p card which required 0-5V switching. The passives were wired to the alarm as normal. In my case the passive when not triggered pulled the i/p of the zone to 0v I fed this through a diode to the digital card and had pull up resistors to all i/p's. When a zone triggered the alarm zone i/p zone went to 12v as normal, the diode did not conduct so the pull ups lifted the digital i/p's to 5V. All worked fine.

 

Ian D

 

----- Original Message -----

From: Mick Furlong

To: ukha_d@xxxxxxx

Sent: Saturday, May 25, 2002 8:34 PM

Subject: RE: [ukha_d] PIRs & Sensors dual wiring

Simon

 

I am thinking of having a pretty standard monitored alarm system and rather than try and make it pass events to a PC or HV I was hoping the signals could be split at source. 

 

What exactly are the issues with doing this via a single relay?

 

Regards

Mick

 

-----Original Message-----
From: Simon Coates [mailto:ecolume@xxxxxxx]
Sent: 25 May 2002 20:19
To: ukha_d@xxxxxxxSubject: Re: [ukha_d] PIRs & Sensors dual wiring

Mick,

 

Depends on the PIR.  Dual output ones aren't a problem - one relay to the alarm and the other to HV etc...However sharing the same relay for an alarm and HV isn't recommended unless the PIR switches a UL double pole relay.

Can I ask why you want to share a PIR?

 

Regards

 

Simon 

----- Original Message -----

From: Mick Furlong

To: ukha_d@xxxxxxx

Sent: 25 May 2002 14:29

Subject: [ukha_d] PIRs & Sensors dual wiring

Is there any reason that a PIR or other sensors cannot be dual wired to an alarm and another device such as a PC or Homevison?

 

Mick

 

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