I've spoken with tech support people several times in the past 7 years in an attempt to get their software engineers to provide one or more circuit configurations in the NX8, and more recently the NX8E, similar to the fire alarm loop configuration -- for use with devices that initiate an alarm by shorting the circuit and initiating a trouble signal when either side of the loop is open.
CO Detectors are available with an internal "trouble" relay, which can be made part of the protective circuit so that when the relay opens its closed contacts (as when the power fails or when the unit fails, etc), a trouble signal at the control panel is the result.
I have had no luck in this endeavor.
The configuration currently available in the NX8E for the combination "short on alarm" and "trouble on open" causes the FIRE light to flash indicating fire. Consequently I do not wish to place my CO detectors in that configuration.
I'm looking for the same type of circuit, but I do not want the panel to indicate FIRE.
Do any of you NX8E techies know if this configuration is possible now? Am I not seeing the forest for the trees? This type of circuit is extremely useful -- as anyone installing heat detectors and smoke detectors can attest to.