threshold and
hysteresis
Threshold and hysteresis work together to establish the ON and OFF points of an analog input. The
threshold defines a trigger point or reporting threshold (ON point) for a sensor input. When the input
value is higher than the threshold, the input is ON. 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.
Threshold
ON point
Time
Input V
alue
Input
Hysteresis
OFF point
In the example shown, the input is considered on at 15 mA. To consider the input off at 13 mA, set the
hysteresis to 2 mA. The input will be considered off when the value is 2 mA less than the threshold.
Setting threshold and hysteresis points prevents inputs from oscillating between ‘on’ and ‘off’ when the
input remains close to the threshold point.
timeout interval
The Timeout Interval is the total elapsed time before the system flags an error condition. This is a
calculated value from Polling Interval (sec) × Maximum Misses.
topology
Topology is the pattern of interconnection between devices in a communication network. Some
examples include point to point, bus, ring, tree, mesh, and star configurations.
transceiver
A transceiver includes both a transmitter and receiver in one housing and shares circuitry; abbreviated
as RxTx.
wireless sensor
network (WSN)
A wireless sensor network is a network of low-power electronic devices that combine sensing and
processing ability. The devices use radio waves to communicate to a gateway device, connecting
remote areas to the central control process.
Yagi
Yagi is the name commonly given to directional antennas. The full name of the antenna is a Yagi-Uda
antenna, named for the developers Shintaro Uda and Hidetsugu Yagi, both of Tohoku Imperial
University in Sendai, Japan. Yagi antennas may also be called beam antennas or directional antennas.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
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