Chapter 1: Functional Description
RS-232 Serial Data
1-28 Service Manual
1.4.3 Nurse Call
1.4.3.1 Contact Ratings
• Maximum resistive load: 4 VA
• Maximum DC switching voltage: 100 VDC
• Maximum switching current: 0.25 A
• Maximum carrying current: 0.50 A
1.4.3.2 Connector
The Nurse Call contacts and the serial data output share the same female, nine pin, d-type connector.
1.4.3.3 Nurse Call Signals
Pin 6: Closed contact under normal conditions, that is, 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.
Incubator Status
Nurse Call Signal
Pins 1 and 6 Pins 1 and 9
Normal Closed Open
Alarm Open Closed
Pwr switch off or pwr fails Open Closed
Nurse Call cable disconnected Open Open
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