General Operation
Performance Verification 27
Table 5 Serial Interface Voltages
5. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the monitor
via the M4787A sensor extension cable.
6. Set the SRC-2 switches as follows:
7. Verify that the monitor is responding to the SpO
2
simulator signal and the
audible alarm is sounding. If desired, press the ALARM SILENCE button
to temporarily silence the audible alarm.
8. Connect the DMM positive lead to pin 9 and verify the voltage value listed in
Table 5. Voltage for pin 9 is that listed for the
alarm underway
condition.
Pin Signal Direction
Measurement (V)
Min. Typical Max.
1 not used 0.4 0.0 0.4
2 RXD<<< input –0.4 0.0 0.4
3 TXD>>> output –0.5 –9.0 –15.0
4 DTR>>> output –5.0 –9.0 –15.0
5 GND –0.4 0.0 0.4
6 DSR<<< input –0.4 0.0 0.4
7 RTS>>> output –5.0 –9.0 –15.0
8 CTS<<< input –0.4 0.0 0.4
9 Alarm Out>>>
(no alarm)
output –5.0 –9.0 –15.0
9 Alarm Out>>>
(alarm underway)
output 5.0 9.0 15.0
SWITCH POSITION
RATE 38
LIGHT LOW
MODULATION LOW
RCAL/MODE RCAL 63/LOCAL
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