Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 218
To verify a sensor is able to measure data properly, you can issue the aM! command to tell the
sensor to measure, and then the aDx! command, to view the measured data. For example, 7M!
tells the sensor at address 7 to measure. The sensor responds with a 5-digit code, where the
first digit is the address, the next 3 digits are the time required for measurement to complete in
seconds, and the last digit is the number of data values measured. After issuing the measure
command, wait the number of seconds indicated. Then issue the aD0! command. The sensor
will respond with one or more data values (to see all the measured data values, you may need
to issue further aD1! --- aDn! commands, till you get all of the data. This is the same sequence
the 8310 automates for you during scheduled measurements.
Power Consumption
On the 8310, the SDI-12, +12V line is protected by a thermal fuse. If you short this line, the
thermal fuse will interrupt the power to the line. Power will be restored when the short is
removed. The entire system load when the SDI-12 sensors are not communicating should be
only a few milliamps per sensor. This will depend on the manufacturer of the sensors being
used. You can measure the current flow through the +12 to check out the correct system
operation. If the current draw is too high you will drain the system battery. Current draw under
sample conditions will be much higher.
The maximum current used on the +12V line should not exceed 0.5 amps at any time.
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