WSDA
®
-2000 User Manual
If Synchronized is deselected, the node will not require a beacon time source and will transmit a
data transmission for each measurement sweep. The user should deselect Synchronized if,
either low latency, or the lowest possible power at slow sample rates, is required.
l Lossless - The user can achieve near lossless data collection in most environments through the
use of data buffering, radio acknowledgments, and retransmissions. Each node buffers collected
data and timestamps to an internal 2 Mbit FIFO buffer. For each transmission, data is pulled from
this buffer. Upon receiving the data packet, an acknowledgment is sent from the WSDA
gateway providing the beacon. The node will retransmit data until this acknowledgment is
received. Inherent overhead in the transmission scheduling protocol assures the node time to
recover from periods of poor radio communication.
This feature allows lossless performance in environments where the node achieves as low as
50% packet error rate. It also allows for operation in situations where the gateway and node
move in and out of range of each other.
NOTE: The Lossless feature is only available when Synchronized is enabled. Disable Lossless if
the application requires consistent latency or can tolerate lost data.
l Node: Indicates the node address beside a box with a check mark. This box is checked by
default to include the node in the sampling. Uncheck the box to exclude the node from the
sampling.
l Channels: Provides a drop-down menu to select the desired sensor channels for the node.
l Sampling: Displays a drop-down menu to select the sample rate. "Continuously" samples
indefinitely, "For" specifies a fixed sampling time-frame, and "Bursting" allows short sampling
durations performed at periodic intervals.
l Data Type: Select the resolution of the data reported by the node. Selecting lower resolution
data will require fewer transmissions and lower power. Selecting "Float" will request the node
send data in the configured calibration unit type.
l Log/Transmit: Select "Log Only" to have the node store all collected data to flash memory for
later download. Select "Transmit Only" to have the node transmit all data while it is collected. Or
select "Log and Transmit" to have the node perform both operations.
l % Total: Indicates the percentage of total over-the-air bandwidth reserved for each node.
l Status: Displays network errors.
l Apply and Start Network: Applies all of the settings, starts the entire network, and starts the
Base Station's beacon.
l Apply and Arm Nodes: This setting allows the user to Arm all of the
nodes without starting the beacon. If the gateway has already enabled
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