RE: PIRs onto HV.

["Kevin Hawkins" <lists@xxxxxxx>]

Title: Message

Nope it's not, yours are quite unusual... Normally the two contacts are 'volts free' meaning they are totally separate from the supply voltage to the PIR. There are two basic types of operation, either normally open or normally closed. The closed means joined together. When the PIR is activated they change from one state to the other. Normally open is often used with an end of line terminating resistor to provide a 2 wire tamper circuit. e.g. Comfort does this. Normally closed usually have a separate tamper pair of wires (as yours do).

 

Is your power for the PIR's being supplied by the HomeVision controller ? - if so your solution is fine.

 

    Kevin

 

-----Original Message-----
From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
Sent: 11 October 2001 14:21
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] PIRs onto HV.

OK ... I have been over at Ian B's playing with these this morning and they work like this ... the two N/C outputs are commoned together and when the PIR isn't activaed they simply float ... when activated they are connected to 0v.

 

Therefore by connecting the PIRs 0v to HVs GND and the N/C output to HVs input line then you can read either a high (normally) or a low (when triggered).

 

Is this how PIRs normally work?

 

Phil

-----Original Message-----
From: Mike Griffiths [mailto:mike@xxxxxxx]
Sent: 11 October 2001 11:37
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] PIRs onto HV.

You’re going to have to phone them Phil

See how they think it should work

Let us know how you got on

 

Mike

Antena

Caernarfon

 

-----Original Message-----
From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
Sent: Thu 11 October 2001 10:02
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] PIRs onto HV.

 

Yeah ... that's what I thought they should be too but I've looked at the PCB for the PIR and sure enough the Blue and yellow are actually connected together by a track.

 

They are PIRs from www.responseplc.com so maybe they're something wierd for their particular alarms but I doubt it.

 

Phil

-----Original Message-----
From: Mike Griffiths [mailto:mike@xxxxxxx]
Sent: 11 October 2001 09:50
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] PIRs onto HV.

Phil

All the PIR's I have come across have NC contacts

Trip the device and it goes open circuit

 

Having said that I've always been able to get into the units and they are normally marked

Your colour code seems to follow the normal standard though

Not too sure where your +ve is coming from

Andrew Roberts on the Comfort news group is always a good guy to ask

 

Mike

Antena

Caernarfon

 

-----Original Message-----
From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
Sent: Thu 11 October 2001 01:15
To: ukha_d@xxxxxxxSubject: [ukha_d] PIRs onto HV.

 

I am just trying to rig a couple of PIRs onto HomeVision to get it to turn some lights on when I walk into my computer room ... the PIRs have 6 terminals. (Blue, Yellow, Red, Black, Green and White).

 

Green and White are intrusion contacts which break when the unit is dismantled.

 

Red and Black are +V and 0V respectively.

 

Blue and Yellow I assumed would be a set of contacts which either make or break when the PIR trips ... however it seems that Blue and Yellow are commoned together and when the PIR trips they are connected to +V.

 

Is this right and if so then how do you connect a security system PIR to HomeVision?

 

Cheers

 

Phil

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