8. Operation
8.1 Sensor measurements
The ClimaVUE 50 responds to the standard SDI-12 commands shown in Table 8-1 (p. 22); refer to
Table C-4 (p. 47) for extended commands.
When using an M!, M1!, or M3! command, the data logger waits for the time specified by the
sensor, sends the D! command, pauses its operation, and waits until either it receives the data
from the sensor or the sensor timeout expires. If the data logger receives no response, it will send
the command a total of three times, with three retries for each attempt, or until a response is
received. Because of the delays this command requires, it is only recommended in measurement
scans of 10 seconds or more.
A C! command follows the same pattern as an M! command with the exception that it does not
require the data logger to pause its operation until the values are ready. Rather, the data logger
picks up the data with the D! command on the next pass through the program. Another
measurement request is then sent so that data is ready on the next scan.
The R7! command directly reads the sensor measurements and outputs all of its values.
NOTE:
This section briefly describes using the SDI-12 commands. For additional SDI-12 information,
refer to SDI-12 sensor support (p. 41), www.sdi-12.org, or the videos SDI-12 Sensors | Watch or
Sniffer Mode and SDI-12 Sensors | Transparent Mode.
ClimaVUE 50 Compact Digital Weather Sensor 21
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