I have an Elk M1G panel. Most of my sensors are NC door and window hardwired sensors. I wired an EOL resistor in series with the zone wire at the senor. I programmed the zone to EOL. Works good, no complaints.
I wired a panic button defined as 23=Police Alarm NO with a EOL resistor in parallel and set the zone to EOL and it worked fine.
I understand from the label on the M1G and the manual that a zone programmed as EOL can have NC contact with the EOL resistor in series or NO contact with EOL resistor in parallel. I then made a chart of the resistance or voltage the panel would see under the 4 conditions and compared NC - EOL with NO - EOL and can't for the life of me figure out how both of those works with the panel.
NC - EOL 2.2kohm in series
Normal Condition: contacts closed panel sees 2.2kohm 7.1V
Alarm Condition: contacts open panel sees infinite resistance 13.6V
Shorted Wires: panel sees short 0V
Open Wires: panel see infinite 13.6
I tested this with one zone that was set to EOL and connected to a NC - EOL and found an Open and Alarm Condition were both reported as Violated, that makes sense. I then shorted the zone input to common at the panel and the status showed 0V but it was also reported as Violated, that I would have expected to show as Trouble. This zone was configured as Burglary Perimeter. Maybe it depends what the zone definition is as to whether a short or open on an EOL zone is reported as trouble vs. violated?
NO - EOL 2.2kohm in parallel
Normal Condition: contacts open panel sees 2.2kohm 7.1V
Alarm Condition: contacts closed panel sees short 0V
Shorted Wires: panel sees short 0V
Open Wires: panel see infinite 13.6V
If I can wire either way leaving the zone definition set to EOL how does the panel tell the difference between normal and voilated on NC - EOL vs. NO - EOL zones? For NC - EOL panel sees infinited resistance (13.6V) when the zone is violated but for NO - EOL the panel sees a short (0V) for a violated zone.
What am I missing here?
I wired a panic button defined as 23=Police Alarm NO with a EOL resistor in parallel and set the zone to EOL and it worked fine.
I understand from the label on the M1G and the manual that a zone programmed as EOL can have NC contact with the EOL resistor in series or NO contact with EOL resistor in parallel. I then made a chart of the resistance or voltage the panel would see under the 4 conditions and compared NC - EOL with NO - EOL and can't for the life of me figure out how both of those works with the panel.
NC - EOL 2.2kohm in series
Normal Condition: contacts closed panel sees 2.2kohm 7.1V
Alarm Condition: contacts open panel sees infinite resistance 13.6V
Shorted Wires: panel sees short 0V
Open Wires: panel see infinite 13.6
I tested this with one zone that was set to EOL and connected to a NC - EOL and found an Open and Alarm Condition were both reported as Violated, that makes sense. I then shorted the zone input to common at the panel and the status showed 0V but it was also reported as Violated, that I would have expected to show as Trouble. This zone was configured as Burglary Perimeter. Maybe it depends what the zone definition is as to whether a short or open on an EOL zone is reported as trouble vs. violated?
NO - EOL 2.2kohm in parallel
Normal Condition: contacts open panel sees 2.2kohm 7.1V
Alarm Condition: contacts closed panel sees short 0V
Shorted Wires: panel sees short 0V
Open Wires: panel see infinite 13.6V
If I can wire either way leaving the zone definition set to EOL how does the panel tell the difference between normal and voilated on NC - EOL vs. NO - EOL zones? For NC - EOL panel sees infinited resistance (13.6V) when the zone is violated but for NO - EOL the panel sees a short (0V) for a violated zone.
What am I missing here?
