Typical zone input design of commercial alarm panel?

Does anyone have a schematic of an input circuit of a typical commercial burglar alarm which requires 1 1K EOL resistor and has a maximum “closed” loop tolerance of 150 Ohms? It would be ultra cool if it were the HAI / AMP / Leviton OmniPro series. But, I imagine most commercial alarm panels like this use about the same basic design to detect Open, Closed, or “Trouble” conditions.

(I’m trying to design a sensor and need to understand typical current and voltage available (as a “parasitic”) to bias a FET, or tiny signal amplifier or something like that.)

Thanks

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July 29, 2023
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