Banner SureCross DX80 Wireless M-GAGE Node - Manual (Page 4)

Banner Engineering Corp. • Minneapolis, MN U.S.A
www.bannerengineering.com • Tel: 763.544.3164 4
P/N 131598 rev. F
SureCross™ DX80 M-GAGE™ Node with Integrated Battery
Parameters
Baseline Filter (M-GAGE)
When the Baseline Filter, or drift filter, is on and the magnetic field
readings are below a threshold setting, an algorithm is used to slowly
match the device’s baseline to the current ambient magnetic field.
This filtering helps to account for natural fluctuations in the magnetic
field.
Low Pass Filter
The filters T0 through T3 (default is filter T2) are parameter settings
that define the degree of input signal filtering. T0 is the least amount
of filtering. T3 is the highest filter setting and has the least amount of
fluctuation between readings.
Sample and Report Rates
The sample rate defines how often the Node samples the sensor. The
report rate defines how often the Node communicates the I/O status
to the Gateway. For FlexPower™ applications, setting the sample
and/or report rates to slower rates extends the battery life.
Change of state reporting sets the system to report only when the
value crosses the threshold setting.
Sample High and Sample Low
The sample high counter parameter defines the number of
consecutive samples that the input signal must be above the
threshold before the signal is considered active. Sample low defines
the number of consecutive samples the input signal must be below
the threshold before the signal is considered inactive.
The sample high and sample low parameters are used to determine
how the debounce filter examines signal transitions.
Threshold and Hysteresis (M-GAGE)
Threshold and hysteresis work together to establish the ON and OFF
points for analog inputs. Setting a threshold establishes an ON point.
Hysteresis defines how far below the threshold the analog input is
required to be before the input is considered OFF. A typical hysteresis
value is 10% to 20% of the unit’s range.
The M-GAGE Node’s threshold and hysteresis ranges are 0 to
65,535.
The factory default threshold setting is 100 and default hysteresis
is 30 (the sensor detects an OFF condition at threshold minus
hysteresis, or 100 - 30 = 70). With the default settings, once the
magnetic field reading is above 100, an ON or “1” is stored in the
lowest significant bit (LSB) in the Modbus register. When the M-GAGE
reading drops below the OFF point (threshold minus hysteresis), the
LSB of the Modbus register is set to “0.”
To determine your threshold, take M-GAGE readings of the test
objects at the distance they are likely to be from the sensor. For
example, if a car reads 100, a bicycle 15, and a truck reads 200,
setting the threshold to 150 will detect only trucks of a specific size.
Magnetic field fluctuations vary based on the amount of ferrous metal
present and the distance from the sensor.