RS485 데이터 시트보기 (PDF) - National Instruments Corporation
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RS485 Datasheet PDF : 7 Pages
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Figure 5. Using LabVIEW WSN can greatly increase battery life for sample intervals under 60 seconds.
Wireless and Mesh Networking
The measurement nodes and gateways communicate wirelessly using 2.4 GHz radios and the reliable NI WSN protocol based on IEEE 802.15.4. The network accommodates up
to 36 nodes per gateway, with access to 14 nonoverlapping wireless channels, so that you can reliably configure fourteen 36-node networks (2,016 analog channels) in the same
vicinity without sharing any wireless bandwidth. Each radio delivers an outdoor range of up to 300 m with line of sight, and up to 100 m indoors, performing reliably even in high
EMI environments.
Gateways, routers, and end nodes work together to form a mesh network. Measurement nodes can operate as routers or end nodes, providing the flexibility to extend the range or
density of your sensor network. When nodes are configured as routers, they can repeat messages from end nodes and extend network range while acquiring measurement data.
When a node powers up, it scans for available networks, locates either a gateway or router node, and attempts to join. When the node joins the network, it downloads the latest
configuration from the gateway and begins its normal operation of acquiring measurement data, controlling digital I/O, and transmitting data back to the gateway for processing,
alarming, and visualization.
Software Overview
With NI-WSN software, you can easily configure your sensor network and quickly extract measurement data from your wireless sensor network with the LabVIEW graphical
development environment.
NI WSN measurement nodes configured with a gateway are automatically added to your LabVIEW project, giving you instant access to their I/O and properties. Simply drag and
drop I/O variables from a LabVIEW project to a LabVIEW block diagram for data extraction, analysis, and presentation. Using the drag-and-drop LabVIEW variables, you can
monitor the digital channels as well as other node attributes such as link quality, battery voltage, and whether a node is configured as a router or end node. These properties help
you intelligently maintain your network and choose the best locations for your measurement nodes.
With the NI WSN serial nodes, you can determine when to send data back to the gateway. You can create custom I/O channels called user-defined I/O variables (UDVs) to
transmit data from the node to the gateway/host. This could be string or numeric data, depending on the type of serial instrument you are interfacing with and the type of data
returned by each serial command/query. These variables are created within the LabVIEW project, and can be written to or read from in LabVIEW.
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