Using the Nurse Call Interface
Service Manual
7-15
WARNING:
A loose connection to the monitoring system data port may result in bad or
missing data.
The nurse call feature allows caregivers to remotely monitor patient alarms and
works in conjunction with the institution’s nurse call system. Reference
The monitoring system provides two different types of nurse call interfaces: an
RS-232 level and relay closure. Both the RS-232 and relay-based level nurse call
function operate when the monitoring system is operating either on AC power
or on battery power.
When enabled, audible alarms signal the remote location. If the audible alarm
has been turned off or silenced, the nurse call function is also disabled.
Pin 11 on the data port is the RS-232 level nurse call signal and pin 5 or 10 is
ground. Reference
, p. 7-5. With no alarm condition, the
voltage between pins 10 and 11 are -5 VDC to -12 VDC, or +5V DC to +12
VDC, depending on the option chosen (either NORM+ or NORM-). With an
audible alarm, the output between pins 5 and 11 will reverse polarity.
Pins 7 and 15 provide a relay that closes when an alarm is sounding on the
monitoring system. Pins 8 and 15 provide a relay that opens when an alarm is
sounding. Pin 15 is common, pin 7 is normally open, and pin 8 is normally
closed. Reference
Test the nurse call function prior to using it in any institution and whenever
setting up the monitoring system in a location that uses nurse call. Users
should periodically confirm not only a firm connection of cables, but also peri-
odically confirm the functionality of the connection. If an attached recom-
mended sensor is not connected to a patient, the screen does not register any
data and the monitoring system remains in the Pulse Search Mode for five sec-
onds, then the monitoring system displays three dashes [ - - - ] in the %SpO
2
and pulse rate area of the screen. One way to test the nurse call function is to
Table 7-7.
Nurse Call Relay Pin States
Pin
No Alarm or
Alarm Silenced
Audible Alarm
Monitoring System
Off
7 NO
Open
Closed
Closed
8 NC
Closed
Open
Open
Summary of Contents for Nellcor GR101704
Page 1: ...Service Manual Nellcor Bedside Respiratory Patient Monitoring System...
Page 8: ...Page Left Intentionally Blank vi...
Page 32: ...Page Left Intentionally Blank 2 14 Service Manual Product Specifications...
Page 46: ...Page Left Intentionally Blank 3 14 Service Manual Theory of Operations...
Page 54: ...Page Left Intentionally Blank 4 8 Service Manual Product Overview...
Page 114: ...Page Left Intentionally Blank 7 18 Service Manual Trend Data Access...
Page 120: ...Page Left Intentionally Blank 8 6 Service Manual Performance Considerations...
Page 168: ...Page Left Intentionally Blank 10 46 Service Manual Modification and Testing...
Page 192: ...Repair 12 4 Service Manual Figure 12 2 Exploded View of Internal Components...
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