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Nurse Call Polarity Settings
Nurse Call Relay Pin States
Nurse Call Relay Rating
N-550B
Nurse Call Polarity
Normally High
Normally Low
Pin
Alarm Silenced
7 N.O.
8 N.C.
Maximum input voltage
Load current
Minimum resistance
Ground reference
Electrical isolation
Alarm State
No alarm or Alarms Silenced
Audible Alarm
No alarm or Alarms Silenced
Audible Alarm
No Alarm or
Audible Alarm
Open
Closed
Closed
Open
30 VAC or 30 VDC
12 mA continuous (peak 300 mA at 100 msec)
26.5 ohms to 50 ohms (40.5 ohms typical during
alarms
isolated ground
1,500 V
Data Port Interface Protocol
Voltage at pins
10 to 11
5 to 12 VDC
-5 to -12 VDC
-5 to -12 VDC
5 to 12 VDC
N-550B Turned
Off
Closed
Open
99
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