Section 2: Interface Box Description
SBE 45 Interface Box
9
Data Output Format
The time between each output scan is governed by the SBE 45’s setup.
The Interface Box outputs the most recent data from the SBE 38 and/or
NMEA navigation device with each scan of SBE 45 data. The Interface Box
outputs data in the following format and order:
Format=0 (standard format)
t1=ttt.tttt, c1=cc.ccccc, s = sss.ssss, sv=vvvv.vvv,
t2 = ttt.tttt, lat = DD MM.MMMM W, lon = DDD MM.MMMM W,
hms = HHMMSS, dmy = DDMMYY
where
•
t1 = temperature from SBE 45 (°C, ITS-90).
•
c1 = conductivity from SBE 45 (S/m);
output if
OutputCond=Y
in SBE 45.
•
s = salinity (psu) calculated from t1 and c1 by SBE 45;
output if
OutputSal=Y
in SBE 45.
•
sv = sound velocity (m/sec); output if
OutputSV=Y
in SBE 45.
¾
If the Interface Box is acquiring data from an
SBE 38
remote
temperature sensor and if the SBE 45 is set to
OutputCond=Y
or
OutputSal=Y
: the Interface Box
recalculates
sound velocity based
on s (or t1 and c1) from the SBE 45 and temperature t2 from the
SBE 38. This provides the most accurate sound velocity results,
because sound velocity is a function of salinity and temperature, and
the SBE 38 typically provides more accurate sea surface temperature
than the thermosalinograph, since it is closer to the seawater intake.
¾
Otherwise: the Interface Box outputs sound velocity calculated from
t1 and c1 by the SBE 45.
•
t2 = temperature from SBE 38 (°C, ITS-90 if
Format=C
in SBE 38;
number of digits after decimal point is set with
Digits=
in SBE 38).
•
lat = latitude from NMEA navigation device.
DD = degrees.
MM.MMMM = minutes and fractions of minutes; number of digits after
decimal point is number of digits in received NMEA string.
W = N (north) or S (south).
•
lon = longitude from NMEA navigation device.
DDD = degrees.
MM.MMMM = minutes and fractions of minutes; number of digits after
decimal point is number of digits in received NMEA string.
W = E (east) or W (west).
•
hms = time from NMEA navigation device (hour, minute, second).
•
dmy = date from NMEA navigation device (day, month, year).
All data is separated with a comma and a space. Each scan ends with a
carriage return <CR> and line feed <LF>. Leading zeros are suppressed,
except for one zero to the left of the decimal point.
Format=1 (custom format for interfacing with a Kongsberg EM 300
Multibeam Echo Sounder)
tt.ttt vvvv.v
where
•
tt.ttt
= temperature from SBE 38 remote temperature sensor (°C, ITS-90).
•
vvvv.v
= sound velocity (m/sec) calculated in Interface Box from:
¾
salinity based on conductivity and temperature measured by
SBE 45, and
¾
temperature measured by SBE 38 remote temperature sensor
Temperature and sound velocity data is separated with a space. Each scan ends
with a carriage return <CR> and line feed <LF>. Leading zeros are
suppressed, except for one zero to the left of the decimal point.
Notes:
•
Inclusion of all parameters except
for t1 (temperature from SBE 45) is
dependent on configuration – if the
system does not include the
specified instrument or the
parameter is not enabled, the
corresponding data is not included in
the output data stream, shortening
the data string.
•
Not all NMEA navigation devices
transmit time and / or date.
•
The SBE 45 must be set up to
output data with
OutputFormat=0
or
1
(SBE 45
OutputFormat=2
is not
compatible with the Interface Box).
Note:
When using
Format=1
:
•
Set up the SBE 45 with:
¾
OutputFormat=0
or
1
,
¾
OutputSV=Y
, and
¾
OutputCond=Y
and/or
OutputSal=Y
and connect an SBE 38 to the
Interface Box.
•
The Interface Box will not output any
parameters other than what is
shown at right, regardless of settings
in the SBE 45 or connection of the
Interface Box to a NMEA navigation
device.
•
Format=1
is not compatible with
Seasave real-time data acquisition
software or SBE Data Processing
post-processing software.
71
Содержание SBE 45 MicroTSG
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Страница 98: ...CALIBRATION SHEETS SBE 45 Temperature Calibration S N 0402 1 SBE 45 Conductivity Calibration S N 0402 2 95 ...
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