Nurse Call - Nellcor NPB-190 Service Manual

Appendix
A5

NURSE CALL

A Nurse Call signal can be obtained by connecting to the serial port. This
function is only available when the instrument is operating on AC power. Nurse
Call will be disabled when the unit is operating on battery power, or if the
audible alarm is turned off or silenced. The remote location will be signaled
anytime there is an active audible alarm.
Pin 11 on the serial port is the Nurse Call signal and pin 10 is ground (see Figure
A-1). When there is no alarm condition, the voltage between pins 10 and 11 will
be -5 to -12 VDC. Whenever there is an active audible alarm condition, the
output between pins 10 and 11 will be +5 to +12 VDC.
A-5