Campbell RainVUE Series, Product Manual, Page: 18 / 53

8. Operation
This section discusses the following:
8.1 SDI-12 measurements 15
8.2 SDI-12 extended commands 18
8.3 SDI-12 version 1.4 identify measurement commands and responses 20
8.4 Calculations 21
8.5 Device Configuration Utility 23
8.1 SDI-12 measurements
The RainVUE-series responds to the SDI-12 measurement commands shown in Table 8-1 (p. 16).
When the data logger issues an
M!
command, the sensor should respond immediately indicating
how long it will take to perform the measurement. The data logger then waits that amount of
time or, if the sensor finishes sooner, the sensor will send a service request to the data logger
indicating data can be collected. After receiving the service request or waiting the indicated time,
the data logger will send the
D!
command to collect the data.
The
C!
command follows the same pattern as an
M!
command, except it does not require the
data logger to pause its operation until the values are ready. Rather, the data logger retrieves the
data with the
D! command on the next scan through the program. Another measurement
request is then sent so that data is ready on the next scan.
NOTE:
SDI-12 sensor support (p. 37) describes the SDI-12 commands. Additional SDI-12 information
is available at www.sdi-12.org .
RainVUE-Series SDI-12 Precipitation Sensors 15