TruSat Technical Reference Manual
2–6
Alarm event relay
The alarm event circuit contains a normally-open relay switch that closes in the
event of an alarm condition and remains closed until the alarm condition ends.
When S1 is switched to “enable,” a multiple-component circuit responds to an
incoming signal, energizes the relay coil, and closes the contact between pin 1 and
pin 3 of the RS-232 DIN 6 connector (X2). The contact rating is 0.5 A @ 200 VAC.
For power conservation, S1 is set to “disable” by default, meaning alarm
annunciation is disabled. When the relay is energized, the board draws additional
power each time an alarm condition is active.
The alarm event relay and the RS-232 output, are isolated from the monitor and from
the patient to eliminate the possibility of ground loops. For over-current safety, the
relay switch is protected by a 1 A fuse (in fuse block F2). If overload from the “nurse
call” system blows the fuse, it can be replaced with a fuse of the same type and
rating.
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