Appendix C: RS-232 Serial Data
Nurse Call
C-2 Service Manual
C.3 Nurse Call
C.3.1 Contact Ratings
• Maximum resistive load: 6 VA
• Maximum DC switching voltage: 24 VDC
• Maximum switching current: 0.25 A
• Maximum carrying current: 0.50 A
C.3.2 Connector
The Nurse Call contacts and the serial data output share the same female, nine pin, d-type connector.
C Closed bed mode. This is either C or N.
00 Set point for humidity. The 00 means the humidifier is not on.
063 Relative humidity in the patient compartment as measured by the compartment probe.
D Air Boost Status. This is a flag describing the status of the Air boost button.
• D means that the Air Boost feature is off.
• A means that the Air Boost feature is on.
• L means that the user forced the feature off.
L Fan speed. This is either L or H.
02043 Heat sink sensor resistance. The resistance-temperature curve is located in the Tips section
of the Troubleshooting chapter.
0000 Last scale weight in grams. The zeros mean that no weight was taken in this patient session.
00 Oxygen set point.
43 Oxygen measurement. If both oxygen set point and oxygen measurement are 0, the GSOCS
module is not installed.
000 SpO2 measurement.
000 Pulse rate measurement.
03 Alarms. This is the alarm code 03. If there are multiple alarms, then all of the codes will be
listed here.
00 The string ends with 00.
Pin 6: Closed contact under normal conditions, i.e., power on, no alarm (recommended
configuration).
Pin 1: Common contact.
Pin 9: Open contact under normal conditions, power on, no alarm. These contacts are not
powered. They only provide closure.
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