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Appendix A
Appendix A-18 Respironics V200 Ventilator Operator’s Manual REF 1057983 A
RS-232 Communications Protocol
Patient Data Report
(PTDT)
When the ventilator receives PTDT followed by a carriage return, it will respond
by transmitting the information shown in Table A-5: “Patient Data Report”.
The ventilator responds to the PTDT 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.
NPPV High Leak
Alarm Limit
60◆◆◆◆ 11 - 60LPM
Stop Code 0x03 N/A N/A N/A ASCII End
Transmission
Character (ETX)
Non-Invasive Positive Pressure Ventilation Settings Report (Continued)
Description Example Resolution Range Units Comments
Table A-4: Non-Invasive Positive Pressure Ventilation Settings Report (Sheet 3 of 3)
Patient Data Report
Description Example Resolution Range Units Comments
Command Name PTDT N/A N/A N/A
Number of
characters between
the start and stop
codes
275 N/A N/A N/A 3 character field
Number of fields
between the start
and stop codes
32 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◆
Measured Peak
Inspiratory
Pressure
24.1◆◆ 0.1 for -20.0 to 99.9
1 for 100 to 130
-20.0 - 130 cmH
2
O
(hPa)
The PIP value from
the Patient Data
screen.
Measured Mean
Airway Pressure
5.6◆◆◆ 0.1 for -20.0 to 99.9
1 for 100 to 120
-20.0 -120 cmH
2
O
(hPa)
The MAP value
from the Patient
Data screen.
Table A-5: Patient Data Report (Sheet 1 of 4)