Chapter 3
3-10 BiPAP® Focus™ Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev A
Theory of Operation
Nurse Call Station/Serial Communications Connector Pinout
WARNING: Use only Respironics-supplied cables with the nurse call station/serial
communications connector.
Physical
Pin Signal
Nurse Call Station
1 Nurse call station common
6 Normally open (NO) during normal (non-alarm) operation
9 Normally closed (NC) during normal (non-alarm) operation
Serial Communications
2 Respironics advanced serial protocol (RASP) RS-232 Transmit (Tx)
3 RASP RS-232 Receive (Rx)
4 Not used
5 RS-232 signal ground
7 RS-232 Tx (reserved for future use)
8 RS-232 Rx (reserved for future use)
NOTE:
• When pins 1 and 6 are used, the relay is open during normal operation,
and closed during an alarm condition including loss of power.
• When pins 1 and 9 are used, the relay is closed during normal operation,
and open during an alarm condition including loss of power.
• Female DB9 connector pin configuration:
BiPAP Focus
System Dimensions
355-mm H x 290-mm W x 140-mm D (14.0-in. H x 11.4-in.
W x 5.5-in. D)
Excluding accessories, gas inlets, patient connections.
Weight 4.5 kg (10 lbs.)
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