Nellcor N-200 Operator's Manual page 58

Guide to Operation
3. Switch section 2 up (Alternate Computer Format and to
some Spacelabs monitors). Once every 10 seconds, and
when the status or limits change, the following data is
transmitted:
<STX>RnnnSnnnPnnnLnnnHnnnOnnnAnnnMnnnTnnnnnn
Qnnn<CR><LF><ETX><CHKSM><ETX>
Note: STX (start of transmission) and ETX (end of
transmission) are shown in hexadecimal equivalents
above their positions in the string. CHKSM stands for
checksum.
4. Switch section 2 down (normal computer format).
<STX>RnnnSnnnPnnnLnnnHnnnOnnnAnnnMnnnTnnnnnn
Qnnn<CR><LF><CHKSM><ETX>
R = Pulse Rate
S = Saturation %
P = Pulse Amplitude (current sample)
L = Low Rate Alarm Limit
H = High Rate Alarm Limit
O = Low Saturation Alarm Limit
A = Alarm Status in ASCII-coded decimal: logic 1 = alarm
condition
Bit 0 = High Rate
Bit 1 = Low Rate
Bit 2 = Low Sat
Bit 3 = High Sat
For example, ASCII 005 = binary 0101 = low sat and high rate
alarms.
M = Monitor Status in ASCII-coded decimal.
Bit 0 = Pulse Search Status 1 = Locked
Bit 1 = Sensor Status
Bit 2 = Audio Alarm Status 1 = Enabled
Bit 3 = ECG Status
Bit 7 = Monitor
Communication
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1 = Attached
1 = Not in Use 0 = In Use
1 = Lost
0 = Search
0 = Off
0 = Disabled
0 = Intact