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18
Other Measurements
The SDI-12 standard allows for other measurement commands such as M1, M2 etc., other current
measurement commands such as C1, C2, etc., other non-concurrent measurements with CRC-16 such as
MC1, MC2, etc, and other concurrent measurement with CRC-16 such as CC1, CC2, etc. This unit
maintains symmetry across all four classes of commands, that is, it returns the same information to a C1 as
it does to a M1 or a MC1 or a CC1. The ACCUBAR
®
supports the following optional measurement
commands:
aM1!
aC1!
aMC1!
aCC1!
measure mB (hPa) using factory calibration. Do not apply any
user scaling, station elevation or offsets. This returns 1 value
and the units are fixed to mB (hPa).
aM2!
aC2!
aMC2!
aCC2!
measure temperature (Celsuis or Farenheit). This returns two
values: the temperature and the units. The units will be 0 for
Celsius and 1 for Farenheit.
aM3!
aC3!
aMC3!
aCC3!
measure user scale, user offset, elevation offset. Use this if
you want to view the user-entered values that can affect the
value returned by the M command.
aM4!
aC4!
aMC4!
aCC4!
measure calibration lab scale and offset. Use this if you want
to view the calibration lab values that can affect the value
returned by the M, C, MC, and CC commands.
(
Version 2.0
and higher
.)
aM6!
aC6!
aMC6!
aCC6!
Measure temperature and pressure. The output is the
concatenation of the M2 and M commands. Temperature,
temperature units, Pressure, Pressure units.
(
Version 2.0
and higher
.)
aM7!
aC7!
aMC7!
aCC7!
Measure mB and degrees C using factory calibration. Do not
apply any user scaling, field calibration or offsets. This
returns two values and the units are fixed to mB and degrees
C.
Remember to issue the aD0! command after the measurement is complete in order to retrieve the data.
Changing the Units
As noted above, the aM! command can return the pressure in several different units. The selection of the
units is made using the XUPcommand:
