In particular, wind measurement typically consumes 60 mW average power (with 4 Hz
sampling ra
te), throughout the averaging period. In the Continuous mode (aXU=M,R) the
power consumption is determined by the internal update intervals of the sensors and wind
averaging time. These have certain limits, so very long measurement intervals cannot be
achieved with this mode. Also the power consumption between the measurements is about
three times that of the Native mode.
More Information
‣
Sensor Configuration and Data Message Formatting (page 117)
7.3.1 Address Query Command (?)
This command queries the address of the device on the bus.
If more than one sensor is c
onnected to the bus, they all respond, causing a bus collision.
Command format:
?!
?
Address query command
!
Command terminator
Response:
a<cr><lf>
a
Device address (default = 0)
<cr><lf>
Response terminator
Example (device address 0):
?!0<cr><lf>
7.3.2 Acknowledge Active Command (a)
This command checks that a device responds to a data recorder or another SDI-12 device. It
ask
s de
vice to acknowledge its presence on the SDI-12 bus.
Command format:
Chapter 7 – Retrieving Data Messages
91
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