Setting Nurse Call Rs-232 Polarity; Calculating The Analog Voltage Output - Nellcor OXIMAX N-600X Series Service Manual

Managing the Data Port
common, pin 7 is normally open, and pin 8 is normally closed. See Rating of Nurse Call
Relay, page 30 for ratings.
7 NO
8 NC
Test the nurse call function prior to using it in your facility and whenever setting up
the OxiMax N-600x pulse oximeter in a location that uses nurse call. If an attached
OxiMax pulse oximetry sensor is not connected to a patient, the oximeter display
reads zeros and the oximeter remains in the Pulse Search Mode for five seconds, then
the oximeter displays three dashes [ - - - ] in the SpO
screen. One way to test the nurse call function is to create an alarm condition (for
example, sensor disconnect) and verify activation of your facility's nurse call system.

Setting Nurse Call RS-232 Polarity

The nurse call polarity can be set to a positive signal (NORM +) on a oximeter alarm
condition or a negative signal (NORM -) on a oximeter alarm condition.
To set nurse call polarity
1. With the oximeter in the normal monitoring mode, press the SETUP softkey.
2. Press the NEXT softkey twice and then press the NCALL softkey.
3. Press the NORM + softkey OR press the NORM - softkey.
4. Press the EXIT softkey.

Calculating the Analog Voltage Output

The OxiMax N-600x pulse oximeter provides analog outputs for saturation, pulse
rate, and the plethysmographic waveform. The output voltage is 0.0 to +1.0 VDC for
all three parameters. The voltage decreases as the values for these parameters
decrease. If no data for a parameter is available, the output voltage for that
parameter is 1.0 VDC.
After the completion of power-on self-test (POST), the oximeter initiates an
automatic three-step calibration signal. The calibration signal begins at 0.0 VDC and
94
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Table 18. Nurse Call Relay Pin States
Pin No Alarm or Alarm Silenced
Open
Closed
Figure 58. Nurse Call Polarity Screen
10030881 Rev. B 12-2008
or call 1-800-674-3655
Audible Alarm
Closed
Open
and pulse rate area of the
2
Oximeter Off
Closed
Open
Service Manual