Bringing the Benefits of Real-Time Data Collection to the World
Sutron Corporation, 22400 Davis Drive, Sterling, Virginia 20164-4444
15
0
units are mB (hPa)
1
units are "Hg
2
units are kPa
3
units are mmHg
4
units are Atm
5
units are psia
9
units depend on user-entered scale and offset.
If the station elevation offset is non-zero, then one of the
following values of u will be returned:
10
units are mB + station elevation offset
11
units are "Hg + station elevation offset
12
units are kPa + station elevation offset
13
units are mmHg + station elevation offset
14
units are Atm + station elevation offset
15
units are psia + station elevation offset
19
user units with non-zero station elevation offset
(mB + elevation offset)
user scale + user offset
set by XE or XS
Set by XUU
In most cases, you will not set up the recorder to store this units identifier. It is provided in response to the
standard measure command to eliminate confusion as to the computation used to come up with the final
value.
Making a non-concurrent Measurement with CRC-16 (MC command)
The command to tell the ACCUBAR
®
to make a non-concurrent measurement with a CRC-16 check on the
data is:
aMC!
where a is the address character, and MC is the command to
make a non-concurrent measurement with a CRC-16
The non-concurrent measurement with CRC-16 command was first defined in version 1.3 of the SDI-12
specification. Therefore the data recorder will have to be SDI-12 version 1.3 or higher compliant before it
can be expected to issue this command and automatically handle the reply to collect data. You can also
issue the command yourself. In reply, the ACCUBAR
®
will respond with
attt2
acknowledging it is address a and indicating that after ttt
seconds are allowed for the measurement, 2 values can be
collected.
When the measurement is complete, the sensor responds with a service request
a
where a is the address character
Note that you still do not have any data from the ACCUBAR
®
. To request the data after a measurement,
aD0!
where a is the address character and D0 is the command to
retrieve measured data. Note: the number zero follows D,
not the letter O.
