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Note that you still do not have any data from the SDI-12 AnalogPlus module. To request the data
after a measurement,
aD0!
a is the address character and
D0 is the command to retrieve measured data.
Note: the number zero follows D, not the letter O.
C, MC and CC commands
The C command is used to make a concurrent measurement. It operates identical to the M command
except that the SDI-12 AnalogPlus module does not issue a service request when the measurement is
complete.
The MC command is identical to the M command except that the SDI-12 AnalogPlus module adds a
CRC to the end of the data.
The CC command is identical to the C command except that the SDI-12 AnalogPlus module adds a
CRC to the end of the data.
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.
Remember to issue the aD0! Command after the measurement is complete in order to retrieve the
data.
Factory Programmed Default Measurements
From the factory, the following commands will make the defined measurement. Issuing an aXEFD! will also
restore these factory defaults.
All of the measurements, except M, C, MC or CC, can be configured to do other types of measurements or
can have user specific parameters as explained in following sections. The M, C, MC or CC will always return
the analog readings on AN1 - AN4 and cannot be reprogrammed. The Analog measurements assume these
default values
:
Averaging Time: 0.067 seconds
Vref Warm-up Time: 10 milli-seconds
Switched Voltage: OFF except in measurement number 6 & 7
Switched Voltage Warm-up time: 100 milli-seconds
Input: Un-Buffered
Gain: Auto-gain
This means that, even though an aM3! from the factory does a frequency measurement, the aM3! command
can be re-programmed to perform any other type of measurement.
M, C, MC, CC
Measure Voltage on channel AN1 through AN4 with respect to ground. 0-5V scale.
