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CS451/CS456 Submersible Pressure Transducer
address. If additional control ports are not available, then the address will need
to be changed.
7.1.5.2 Extended SDI-12 Commands
Extended SDI-12 commands can be used to configure the CS451/CS456 data
output and sample number. These commands are used to select the
temperature units (Celsius or Fahrenheit), pressure/level units (psig, kPa, bar,
feet, meter, inches, or millimeter), and the integration time for each
measurement. If level units are selected, they will represent level of fresh
water. The multiplier (slope) and offset should be used to correct for relative
density of water.
Sample number represents the number of values used to provide the output
value received by the datalogger. This output value is an average of the
samples.
The extended SDI-12 command used to configure output units is
aXCONFIG1=tt,pp,mmm.mm,000.00!
where
a
= the SDI-12 address of the
sensor,
tt
= temperature units,
pp
= measurement unit,
mmm.mm
= multiplier
(slope), and
000.00
= offset.
Valid entries for tt (temperature) are:
0 = Celsius
1 = Fahrenheit
and valid entries for pp (pressure/level) are:
0 = psig
1 = kPa
2 = Bar
3 = Feet
4 = Meter
5 = Inch
6 = Millimeter
Only SDI-12 instruction aM!, aM7!, and aM8! output the results obtained
when using the multiplier and offset. The multiplier and offset are only applied
to the pressure/level value, not to the temperature.
The extended SDI-12 command used to configure sample number is
aXCONFIG2=nnn!
, where nnn is the number of samples that will be measured
to obtain the final output value, which is an average of the samples taken. This
value only applies to the
aM8!
command. The integration time is a result of
the number of samples selected. This value can be derived by adding 2 s to the
number of samples. For example, if nnn = 50, then 50 samples would be
averaged. The integration time for this process is 50 plus 2, or 52 s.
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Содержание CS451
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