aAb!
Changes the sensor address. a is the current address and b is the new address.
Response is the new address.
Syntax:
aAb!
aI!
Requests the sensor identification. Response is defined by the sensor
manufacturer, but usually includes the sensor address, SDI-12 version,
manufacturer's name, and sensor model information. Serial number or other
sensor specific information may also be included.
Syntax:
aI!
An example of a response from the aI! command is:
013NRSYSINC1000001.2101 <CR><LF>
where:
0 is the SDI-12 address.
13 is the SDI-12 version (1.3).
NRSYSINC indicates the manufacturer.
100000 indicates the sensor model.
1.2 is the sensor version.
101 is the sensor serial number.
SDI-12 Start Measurement Commands
Measurement commands elicite responses in the form:
atttnn
where:
a is the sensor address
ttt is the time (s) until measurement data are available
nn is the number of values to be returned when one or more subsequent D!
commands are issued.
aMv!
Starts a standard measurement. Qualifier v is a variable between 1 and 9. If
supported by the sensor manufacturer, v requests variant data. Variants may
include alternate units (e.g., °C or °F), additional values (e.g., level and
temperature), or a diagnostic of the sensor internal battery.
Syntax:
aMv!
As an example, the response from the command 5M! is:
500410
270
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