3XQS+1000+0.01+100!
If the user wanted to connect it to a data logger that expected an incremental encoder that with a
resolution of 0.01 feet and could track a rate of change of 2 feet per second then the command
would be:
3XQS+100+0+200!
This represents a command to the ACCUBUBBLE at address 3 to produce 100 steps per unit of
change (units of pressure, XUP command, is 0 for feet of water), no threshold, and to produce 200
steps per second (200/100 or 2 feet per second).
Setting the Quadrature Output’s Reading
The Quadrature output is an incremental output. It indicates a change in the value, it does not report
an absolute value. The device the ACCUBUBBLE is connected to will have some indication of
what it thinks the current reading is. To facilitate synchronizing the quadrature input device with
the true pressure reading of the AccuBubble, the ACCUBUBBLE has an extended command to set
the quadrature output to the current reading of the quadrature input device. The XQC command
causes the ACCUBUBBLE to drive the quadrature input device to match the reading of the
AccuBubble.
aXQCv!
where a is the address character, XQC is the extended command to set the
Quadrature Current value where v represents the quadrature value as
indicated by the quadrature input device.
Once the XQC command is given, the ACCUBUBBLE knows the level as perceived by the
quadrature input device. The next time the ACCUBUBBLE complete a pressure measurement, it
will check and see if the difference between the input value and the measured pressure exceeds the
threshold level set by the XQS command. If so, it will drive the quadrature output to update the
quadrature input device.
NOTE: If the XQS command needs to be given (M5 command returns current value of Scale,
Threshold, Rate, and Operating Mode parameters), it should be issued with the correct parameters
before issuing an XQC command.
Use of an ACCUBUBBLE with a Sutron 5600-0126-1 Chart Drive
The 5600-0126-1 Chart Drive requires 1000 steps for one rotation of the shaft. The maximum input
step rate is 100 steps per second. The higher the quadrature threshold is set, the lower the power
consumption for the chart drive. The factory default settings of the ACCUBUBBLE of 1000 for the
scale factor, 0.01 for the threshold, 100 for the step rate, and Feet of Water as the units for the M
command will produce one shaft rotation per foot of water. To produce Clockwise rotation of the
shaft as viewed from the end of the shaft for increasing water level, connect Phase A to the chart
drive input labeled A, and Phase B to the chart drive input labeled B. For counter-clockwise
rotation, either reverse the connections (A to B, B to A) or enter the quadrature scale factor as
-1000.
Configuring the Analog Output (5600-0131-4 and 56-0131-50-2 models
only)
Analog Output Range
The 5600-0131
-
4 and 56-0131-50-2 models support an analog output. The output range is 0 to 5
volts. As shipped from the factory, this corresponds to 0 to 22 psig. The analog output is driven by
a 12 bit D/A converter. This means that the output changes in discrete steps of about 1.25 mV.
Analog transmission of data is less accurate than digital transmission. There are three contributors
to this error: Error in the transmitted value; noise and voltage drops picked up during transmission
through the cable; and conversion errors at the receiving end. For the AccuBubble, the error in the
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Summary of Contents for Accububble 56-0131-50-1
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