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PIR TTL Open Collector
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 Posted: Wednesday Oct 29th, 2014 02:24 pm
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rodime
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Hello,

We have a motion detector that has a TTL Open Collector Alarm Output.   Is this able to work with comfort and if so what should be the zone type/config settings?

Thanks



 Posted: Wednesday Oct 29th, 2014 03:30 pm
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slychiu
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You can connect the open collector output to Comfort zone input. Connect the Zone Common to the ground/0V of the detector

Zone type is the same as a normal PIR ie PIR Night/away or PIR away




 Posted: Wednesday Oct 29th, 2014 04:00 pm
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rodime
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Hi Chiu,

I did that, however the movement triggers a zone trouble alarm (using pirnightaway with security off). Is the fact that it is TTL output significant?



 Posted: Wednesday Oct 29th, 2014 04:06 pm
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slychiu
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A zone trouble alarm is due to End of line resistors or lack of EOL resistors
If the zone shunt is in the double EOL position then you must connect  the EOL resistors

If you do not want EOL resistors then move the shunts to the No EOL position



 Posted: Wednesday Oct 29th, 2014 04:44 pm
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rodime
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The shunt is in no EOL, we've not use EOL before and this is a new type of PIR. Could this be something built into the PIR requiring EOL? PIR documentation is non existent.

When testing the circuit, the movement triggers a pulsed output as opposed to a continuous close. Not sure if that is relevant.



 Posted: Wednesday Oct 29th, 2014 04:56 pm
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slychiu
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Are you sure it is an Open Collector output? There may be a voltage connected to the output causing the zone trouble. A zone trouble is caused by external voltage at the zone input

Disconnect the detector from Comfort and measure the voltage between Open collector and common. When there is no movement, there should be no voltage, when there is movement the voltage should be close to 0



 Posted: Wednesday Oct 29th, 2014 05:17 pm
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rodime
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The documentation states it is a TTL alarm output and open collector 30ma max. Using a multimeter I get a reading of 3.4v when the movement triggers



 Posted: Wednesday Oct 29th, 2014 05:23 pm
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slychiu
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3.4 Volts is not an open collector voltage when the transistor is on

anyway there seems to be a contradiction as a TTL output is not an open collector output.

TTL is a digital output > 3.4 volts high and < 2.0 volts low (but TTL logic should have gone extinct together with the dinosaurs)

An open collector output is a transistor output which is open circuit when off and pulled to 0V when on



 Posted: Wednesday Oct 29th, 2014 05:50 pm
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rodime
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ok, so assuming it is in fact a TTL digital output, can this be used with Comfort?



 Posted: Wednesday Oct 29th, 2014 06:19 pm
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slychiu
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Try a digital n/c zone type
See if it can detect on and off
If so you can change the alarm type to make it trigger alarm



 Posted: Wednesday Oct 29th, 2014 06:19 pm
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slychiu
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Try a digital n/c zone type
See if it can detect on and off
If so you can change the alarm type to make it trigger alarm



 Posted: Wednesday Oct 29th, 2014 06:19 pm
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slychiu
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Try a digital n/c zone type
See if it can detect on and off
If so you can change the alarm type to make it trigger alarm



 Posted: Wednesday Oct 29th, 2014 07:10 pm
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rodime
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No, I get nothing on a digital n/c zone type



 Posted: Thursday Oct 30th, 2014 08:15 am
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slychiu
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I think you will need technical information from the manufacturer on how to cxonnect to an alarm system



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