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Setting the parameter to 1 tells the station to use the first value returned from the sensor; setting
parameter to 3 tells the station to use the third value returned from the sensor.
If you want to record (and transmit) more than one parameter from a single SDI-12 sensor, a different
measurement needs to be set up for each parameter. These measurements should have identical setups,
except for the
SDI-12 Param
setting. Be sure to keep the measurement time and interval the same for
these measurements and the station will make a single measurement to provide the data for both. If you
vary the time and interval, the station will end up taking multiple sensor measurements even though one
would have sufficed (thus slowing down the system and using more power).
In the case of devices which require multiple commands to be issued (e.g. 0M1! retrieves pressure, 0M2!
retrieves temperature) multiple measurements need to be set up. It does not matter if these
measurements are scheduled for the same time, as the station will have to issue multiple commands to
the sensors.
When multiple measurements of type SDI-12 are scheduled to go at the same time, the station orders the
measurement commands so that concurrent measurements are commanded first. Non-concurrent
measurements occur while waiting for concurrent results. Also, the station is able to recognize when two
different measurement schedules rely on data from a single measurement command (e.g., measurement 1
commands 0M! and expects parameter 1 while measurement 2 commands the same and expects
parameter 2, both scheduled at the same time). In such cases, the station outputs the measurement
command only once.
Warmup
If this number is not zero, then the Switched Power line (terminal #8, SWD+12V) and VREF (terminals #25
and #21) will be turned on for warmup seconds prior to talking to the SDI-12 sensor. The line will be kept
on until the measurement completes.
You may use SWD#1 12V instead of SDI-12 Power to supply power to the SDI-12 sensor as long as the
sensor does not require to be powered on all the time. Some sensors (such as the Sutron SDR) need to be
powered on all the time and will not work correctly if powered from the Switched Power line.
If you power the sensor via Switched Power, you must setup the Warmup to at least
one second!
Why use Switched Power instead of SDI-12 Power? To reduce power consumption of the SDI-12 sensor.
SDI-12 Power is turned on all the time, while Switched Power is only turned on during the measurement if
Warmup is not zero.
Please note that using LinkComm's Send SDI-12 Command window will NOT turn on Switched Power.
However, doing a Live/Forced measurement will.
SDI-12 Command Utility
The SDI-12 command utility dialog is used to send SDI-12 commands to sensors. It can also be used to
quickly find what sensors are connected to the SDI-12 bus.
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