YSI SonTek ADVField, Technical Documentation Manual

Page: 105 / 228

SonTek/YSI
ADVField/Hydra Operation Manual (September 1, 2001) 93
Appendix 1. ADVField Real-Time Data Output Formats
This appendix describes the various formats of the output data generated by the ADVField during
real-time
data collection. The format is the same for all ADVField configurations and models.
See Appendix 2 for the output data formats generated during
autonomous
data collection. For a
description of the real-time binary
output data file
format that is generated by the ADV data ac-
quisition software, see the
ADVField Software Manual
.
During real-time data collection, the ADVField sends data outputs over the serial port in either
ASCII or binary format depending on the setting of the
OutFormat
command (§3.5).
•
Section A1.1 describes the real-time ASCII output format over the serial port.
•
Section A1.2 describes the real-time binary output format over the serial port.
A1.1. Real-Time Output Data – ASCII Format (to Serial Port)
If
OutFormat
=
ASCII
, the ADV will send output data to the serial port in a tab-delimited ASCII
format with one line of data for each sample.
•
After each velocity sample is collected, the ADV outputs one line of data to the serial port.
The length of the line varies depending on which optional sensors are installed (compass/tilt,
temperature, pressure, external sensors).
•
Each line of data is formatted such that a series of samples forms a tabular output that can be
easily loaded by data analysis software.
•
The maximum ASCII output rate when using 9600 baud is about 5 Hz. If higher sampling
rates are required, either use binary output or increase the baud rate (see §4.2).
•
Table 22 shows what data values are output in each column based on which optional sensors
are installed.
The following list defines each data type shown in Table 22.
•
Sample Number
– The sequence of samples from the start of data collection (0 to 65535).
•
(
Vx
or
Veast
), (
Vy
or
Vnorth
), (
Vz
or
Vup
) – The three velocity components (Vx/Vy/Vz if
the coordinate system is XYZ; Veast/Vnorth/Vup if the coordinate system is ENU) in units
of 0.1 mm/s (range: -32767 to 32767).
•
Amplitude 1/2/3
– Signal strength for each of the three acoustic receivers in units of counts
(0 to 255). One count is equal to 0.43 dB.
•
Correlation 1/2/3
– Correlation values for each of the three acoustic receivers as a percent-
age (0 to 100). See the
ADV Principles of Operation
for a description of the correlation data.
•
Heading
,
Pitch
,
Roll
– Heading, pitch, and roll data from the optional compass/tilt sensor in
units of 0.1
°
. Heading range is 0 to 3600 (0.0 to 360.0
°
), pitch and roll are -500 to 500
(-50.0
°
to 50.0
°
).
•
Temperature
– Temperature from the optional sensor in units of 0.01
°
C.
•
Pressure
– Pressure from the optional sensor in counts. Pressure data is stored and output as
counts to accommodate a variety of pressure sensor ranges. Counts can be converted to dBar
using the pressure calibration constants stored in the file header (see §4.8 for details).