Nellcor N-200 Operator's Manual page 62

Guide to Operation
Data Packet Descriptions: The following data packets may
be received in trend or event data transmission. For V, W, X,
and Z packets, the first field (n . . n) has variable length.
E Packet
This is the last record sent to indicate end of data in normal
completion.
V Packet
This is sent only if the N-200 stops before the requested data
transmission is complete. It indicates why the N-200 stopped.
nnn
4
8
16
32
64
128
W Packet
These are the actual trend data points. Data is sampled every
second, so each packet represents 5 seconds of saturation and
pulse rate data.
X Packet
These are the actual event data sampled every second. There is
no averaging, so each packet represents 1 second of saturation,
pulse rate, and pulse amplitude data.
56
< STX > E < CRLF > < ETX >
< STX > Vnnn < CRLF > < ETX >
Reason for Stop
Timeout error
Data error
Timed out error
Communications lost
Data recall error
By operator request
< STX > Wn . . . nSnnnRnnn < CRLF >
< ETX >
Wn . . . n Trend data point (n . . . n =
current index up to 4 digits)
Snnn Saturation
Rnnn Pulse rate
< STX > Xn . . . nSnnnRnnnPnnn < CRLF >
<ETX >