attt02
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 does NOT issue a service request Note: this is
different from the M and MC commands.
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.
In this case, the sensor will reply with two values in the format:
AvuC
where a is the address, v is the data value, u indicates the unit's
units, and C is the CRC-16 encoded into 3 ASCII characters.
Both v and u have the format of a polarity sign (
+
or
−
)
followed by up to seven digits, including a decimal point. The
CRC-16 is always the last three characters which are never a
numeric digit.
The u indicates the units of the measurement. When u is 0, the value has units of feet of water.
When u is 1, the units are psi. When u is 9, the units depend on a user entered slope and offset. u
can also take on additional values after a field calibration has been performed. The following table
summarizes all the values of u.
0
units are feet of water
1
units are psi
2
units are kilopascals
3
units are cm of water
4
units are meters of water
5
units are mm of water
9
units depend on user-entered scale and offset.
If the field calibration offset is non-zero, then one of the following values of u will be returned:
10
units are feet of water with non-zero field calibration offset
11
units are psi with non-zero field calibration offset
12
units are kilopascals with non-zero field calibration offset
13
units are cm of water with non-zero field calibration offset
14
units are meters of water with non-zero field calibration offset
15
units are mm of water with non-zero field calibration offset
19
user units with non-zero field calibration offset
(psi + field calibration offset)
∗
user scale + user offset
set by XE or XS set by XUU set by XUU
If the unit has had its calibration modified at a standards lab other than at Sutron, then the value
returned for u will have one hundred (100) added to it. In other words, if the XC command has
been utilized to set the calibration scale factor to other than 1 or the calibration offset factor to other
than 0 then 100 will be added to the units indicator.
Bringing the Benefits of Real-Time Data Collection to the World
Sutron Corporation, 21300 Ridgetop Circle, Sterling, Virginia 20166-6520
15
Summary of Contents for Accububble 56-0131-50-1
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