How to interconnect Kidde smoke/co combo detectors Mod# KN-cope_IC with Edwards Heat detectors Mod# CR-135-2 using relay SM120X

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How do you wire the above units so the smoke/co detectors will all ring when heat detectors are activated. The heat detectors are a two wire hook-up. Existing wiring to heat detectors is existing and in wall. Hard to change to 3-wire.
#Smoke-detectors
https://diy.stackexchange.com/questions/149850/how-to-interconnect-kidde-smoke-co-combo-detectors-mod-kn-cope-ic-with-edwards