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The HK circuit contains a photo coupler powered by the IDL-4802 to detect the
"open" or "close" status of the loop between HK_IN and HK_COM (users don’t
need to feed 3.3v power into the circuit). As to the alarm output, there is a relay
between ALMOUT and ALMCOM to control the status of the loop to be "OPEN" or
"CLOSE" to the alarm equipment (close between ALMOUT and ALMCOM for alarm;
open if no alarm).
HK Port RJ-50 pin assignment:
Operation diagram of Housekeeping Inputs and Alarm Contact Output: