Operational Overview
Doc.#6000-0015 Rev: A
Page 20
Because the Nodes are compact, lightweight, rugged units, they can be
mounted close to the sensors they monitor. Any number of Nodes can be
mounted in a building or on a machine. Refer to Appendix F,
Node
Mounting
.
The CrossNet Node collects data from multiple sensors and transmits the
data via Bluetooth wireless communications to a network hub or other
Internet appliance such as a computer (desktop, laptop, or hand-held). The
CrossNet Node can supply excitation to each sensor, or external sensor
power can be supplied (see Figure 16). Up to four channels are available on
each Node. Each channel is ready to receive fully conditioned analog
sensor signals as well as the digitized IEEE 1451 TEDS (Transducer
Electronic Data Sheet) information from the CrossNet Smart I/O (SIO).
(See the next section,
Smart SIO
.) The sensor signal is digitized (16-bit
A/D resolution) for transmission along with the TEDS for each sensor.
This allows each channel to identify itself to the host system. The Node can
operate from either an external power supply or an attached battery pack.
The CrossNet Node can initiate operation in a number of ways.
•
Data can be acquired and returned upon request from the host
device.
•
An event trigger can be established to start acquiring data based on
one of the sensor channels (enter or exit an alarm region or alarm
threshold).
•
An external TTL signal can be activated to initiate data sampling
(future option).
The data can be a single measurement from each channel, an average of a
number of measurements, or data that has been logged over a user
determined amount of time at a user-defined sampling rate. In the data
logging mode, a time stamp is included with the data.
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