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Switched Voltage SW’D
The module supports 2 values of switched voltage: 5volts and 12 volts (Switched input power) on SW‟D port.
The function of this port is controlled by SDI-12 command
aXW+s!
where,
a: SDI-12 address of module
S=0: if SW‟D is required to be always off irrespective of any M command
S=1:(default) SW‟D gives 0volts when not taking any measurements. During a measurement, it has a value
set through corresponding measurement set-up command
S=5: if SW‟D is required to be always 5volts, during idle condition as well during any M command
S=12: if SW‟D is required to be always 12volts, during idle condition as well during any M command
S=(other value) : no effect
Note: There is only one switched voltage terminal connection. Do not connect a 5V only device to the
switched voltage and then perform a measurement that has been configured to use a 12V switched voltage
because 12V would then be applied to the 5V device.
Resetting to a Factory Default Configuration
The reset to factory defaults command provides a means to reset most user configurable parameters
in a unit back to the factory defaults. If the previous history of a unit is not known, it is
recommended that this command be issued before configuring the unit to ensure a known starting
configuration. The SDI command for this is
aXEFD!
Where a is the SDI address of the module
Note
: It is recommended that the unit be powered down and back up after issuing this command.
