Setting Nurse Call Rs-232 Polarity; Setting Nurse Call Relays Normally Open/Closed - Nellcor OXIMAX N-560 Operator's Manual

Using the Data Port

Setting Nurse Call RS-232 Polarity

Setting Nurse Call Relays Normally Open/Closed

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Pin 11 on the data port is the RS-232 level nurse call signal and pin 5 or
10 is ground (see Table 1 on page 48). When there is no alarm condition,
the voltage between pins 10 and 11 is -5 to -12 VDC. Whenever the
N-560 is in an alarm condition, the output between pins 10 and 11 is +5 to
+12 VDC. This is the default condition (normally low). There is a service
menu to change the default condition. Refer to the N-560 service manual
for the procedure.
Pins 7 and 15 provide a relay that closes when an alarm is sounding on the
N-560. Pins 8 and 15 provide a relay that opens when an alarm is
sounding. Pin 15 is a common lead for both relays.
Note: When the relay is closed there is approximately 27 ohms of
resistance.
The nurse call polarity can be set to a high signal on an N-560 alarm
condition or a low signal on an N-560 alarm condition. Refer to the N-560
service manual for setting the Nurse Call RS-232 polarity.
Data port pins 7 and 15 provide a relay that closes (nominally 27 ohms)
when an alarm is sounding on the N-560. Pins 8 and 15 provide a relay
that opens when an alarm is sounding. Pin 15 is a common lead for both
relays. The relay operates whether the N-560 is operating on AC power or
battery.