Simplex 4009 Manual page 4

Alarm Input
Requirements
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When using 565-386 or 565-388 signal cards the alarm input from the host
NAC must be 20 to 32 volts DC, with a maximum ripple voltage of 2 volts peak-
to-peak.
When using 565-545 or 565-569 signal cards the alarm input from the host NAC
must be 18 to 32 volts DC, unfiltered power supplies can be used.
Alarm current for all signal card configurations is a maximum of 2 A at 24 VDC
per circuit, and is power-limited. Minimum alarm current per Signal Card (total
of four circuits) must be 0.9 VDC. (See the 841-925 Field Wiring Diagram.)
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