WSDA
®
-2000 User Manual
Periodic Burst Sampling: a mode of operation in which the node is sampled for a fixed window of
time (burst) and then repeats that window at set intervals. The burst duration and time between bursts
is configurable. Also referred to as burst sampling.
Ping: a byte transmitted by the gateway to the node. The node responds by echoing the byte,
indicating communication exists between the node and gateway.
Range Test: a continuous string of pings used to validate communication between the gateway and
the node over distance and obstruction
Real Time Clock (RTC): a computer clock that keeps track of the current time
RFI: Radio Frequency Interference is a disturbance in an electrical circuit due to electromagnetic
induction or radiation.
RSSI: Received Signal Strength Indication is a measurement of the transmission power in a radio
signal. It is measured in decibels with reference to 1 milliWatt (dBm).
RS232: a serial data communications protocol
Sensor: a device that physically or chemically reacts to environmental forces and conditions, producing
a predictable electrical signal
Sleep: a command transmitted to the node to put it into sleep configuration
Sampling: the process of taking measurements from a sensor or device
Sampling Mode: the type of sampling that is being utilized, such as event-triggered, continuous, or
periodic. The nodes have several sampling modes that employ these types of sampling.
Sampling Rate: the frequency of sampling
Slope: When describing a mathematically linear relationship, the slope is the steepness of the line that
represents that relationship on a graph. The equation of a straight line is:
y = mx+b
, where
x
is the x-
axis coordinate,
y
is the y-axis coordinate,
m
is the slope, and
b
is the offset.
Streaming: Streaming is a sampling mode in which all active channels (and the sensors attached to
them) are measured, and the acquired data is transmitted to the gateway and software. The data is not
written to non-volatile memory during streaming. Streaming can either be finite (have a user defined
start and end time) or continuous (continued until the power is cycled on the node).
Synchronized Sampling: a sampling mode that automatically coordinates all incoming node data to a
particular gateway. This mode is designed to ensure data arrival and sequence.
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