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Hi Mick
you can easliy add extra PIR's. The N/C on the
PIR
stand for Normally Closed. This means the nc contacts when no movement is
detected are shorted together. Because N is link to + then the input to the
card
will see + volts as normal. When movement is detected the n/c become open
circuit. Now instead of + volts to the input it is linked via the 10K
pull
down resistor to GND and the input will see 0 Volts.
If that didn't make sense then just wire the
PIR's
like this......
Remove the resistor and put it between
the +in
on the card and GND.
all + to +volts
All - to GND
Wire the first PIR C to the + Input of the
card.
Wire the N to the next PIR C
terminal.
Keep wiring like this with N of the previous
PIR to
C of the next PIR.
On the last PIR in the chain link the N to +
volts.
All the N/C's have now been wired in series,
so if
any PIR trips the circuit is broken and the Input will go to 0
Volts.
Hope that helps.
Ian D
----- Original Message -----
Sent: Saturday, June 08, 2002 12:18
AM
Subject: RE: [ukha_d] PIR wiring
Help
Frank
I
think you could well be right, the diagram I have for this shows only one
PIR
connected which would support that view.
I
will have a play with it tomorrow and see if I can work out what is going
on,
if not I will be looking for more help!
Cheers
Mick
Mick
Just one quick note . You
only require One RESISTOR in an alarm panel and it normally goes to the
furthurest pir hence end of lin resistor. Maybe this resistor is just a
pull
down resistor?
Frankm Mc
----- Original Message -----
Sent: Saturday, June 08, 2002 8:59
AM
Subject: RE: [ukha_d] PIR wiring
Help
Frank
thanks for the response yup there are 4 terminals on the pir (or 6
if you include tamper) C + and - are wired as shown with N being linked to
+ so only 3 wires actually leave the PIR
Just to point out this is not an alarm control panel it is a linux
box with special ports and I think it is going to need some non standard
wiring.
I will try and get my head around how it operates as I want to try
running about 3/4 pirs per input to have a try at room occupancy
detection.
Cheers
Mick
Hi Mick
Normally with an alarm panel there is an END OF LINE
resistor connected in series with the alarm contacts AT THE PIR.
Normally to add an extra pir you would just series the contact wires at
the control box . Your explanation only mentions 3 wires,you would need
4 i believe . Have you got 4 wires at your pir? The tampers are series
as well.
Frank Mc
----- Original Message -----
Sent: Saturday, June 08, 2002
12:40 AM
Subject: [ukha_d] PIR wiring
Help
I am trying to wire up a number of PIRs to a Linux box which
has specific digital inputs similar to homevision.
All works fine for a single PIR however I want to wire several
on a single input so that any of the pirs triggering will trigger the
input and also I want to wire the Tamper contacts in a similar
way on a seperate input.
For a single PIR I have.....
Input
PIR
In+
to
C
+12
to +
GND
to
-
In- on the input is linked to GND on the
input
+ on the PIR is linked is linked N on the
PIR
and finally there is a 10k resistor between - on the PIR and C
on the PIR
This all works fine but can someone please explain how I add
additional PIRs?
Cheers
Mick
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