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Appendix A
Appendix A-16 Respironics V200 Ventilator Operator’s Manual REF 1057983 A
RS-232 Communications Protocol
Non-Invasive Positive
Pressure Ventilation
Settings Report
(NPVS)
When the ventilator receives NPVS followed by a carriage return, it will respond
by transmitting the information shown in Table A-4: “Non-Invasive Positive
Pressure Ventilation Settings Report”. The ventilator responds to the NPVS
command by returning a string with a variable length. Fields 2 through 4
define the length of the message. The last character transmitted is a stop code
indicating the end of the message. The second field indicates the number of
characters between the start and stop codes. The third field indicates the
number of fields between the start and stop codes. The fourth field is the start
code, 0x02. The last field in the string is the stop code, 0x03.
PCV High Minute
Volume Alarm Limit
Setting
60.0◆◆ 0.01 for
0.00 to
9.99
0.1 for
10.0 to
60.0
0.00 - 60.0 L
Stop Code 0x03 N/A N/A N/A ASCII End
Transmission
Character (ETX)
Pressure Control Ventilation Settings Report (Continued)
Description Example Resolution Range Units Comments
Table A-3: Pressure Control Ventilation Settings Report (Sheet 3 of 3)
Non-Invasive Positive Pressure Ventilation Settings Report
Description Example Resolution Range Units Comments
Command Name NPVS N/A N/A N/A
Number of characters
between the start and
stop codes
168 N/A N/A N/A 3 character field
Number of fields
between the start and
stop codes
23 N/A N/A N/A 2 character field
Start Code 0x02 N/A N/A N/A ASCII Start
Transmission
Character (STX)
Time of request 13:45◆ N/A N/A N/A 24 hour clock,
hh:mm◆
Date FEB◆23◆1997◆ N/A N/A N/A 12 character field,
MMM◆DD◆YYYY◆
Current Ventilation
Type
VCV◆◆◆ N/A VCV◆◆◆
PCV◆◆◆
NPPV◆◆
N/A The ventilation
type currently
being used by the
ventilator.
Table A-4: Non-Invasive Positive Pressure Ventilation Settings Report (Sheet 1 of 3)