For most data loggers, the
SDI12Recorder()
instruction has the following syntax:
SDI12Recorder
(Destination, SDIPort, SDIAddress, “SDICommand”, Multiplier,
Offset, FillNAN, WaitonTimeout)
For
the
SDIAddress
,
alphabetical
characters
need
to
be
enclosed
in
quotes
(for
example,
“A”
).
Also
enclose
the
SDICommand
in
quotes
as
shown.
The
Destination
parameter
must
be
an
array.
The
required
number
of
values
in
the
array
depends
on
the
command
(see
13)).
FillNAN
and
WaitonTimeout
are
optional
parameters
(refer
to
CRBasic
Help
for
more
information).
A
downloadable
example
program
is
available
at
8.
Operation
8.1 SDI-12 measurements
The SoilVUE 10 responds to the SDI-12 commands shown in
(p. 13). Because of the
delays the M! command requires, Campbell Scientific recommends measurement scans of at least
10 seconds per sensor. For instance, the recommended scan rate for a 0.5 m probe with six
sensors is at least 60 seconds. A
C!
command does not require the data logger to pause its
operation until the values are ready.
SoilVUE™10 Complete Soil Profiler
12
