XB24-BPDK Digi International/Maxstream, XB24-BPDK Datasheet - Page 49

• Manufacturer Part Number: XB24-BPDK
• Description: KIT DEVELOPMENT XBEE SERIES 2
• Manufacturer: Digi International/Maxstream
• Series: XBee™r
• Type: 802.15.4/Zigbeer

Specifications of XB24-BPDK

• Frequency: 2.4GHz
• For Use With/related Products: XBee™ Series 2 Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5. Network Commissioning and Diagnostics
5.1. Device Discovery
5.2. Device Configuration
5.3. Device Placement
5.3.1. Link Testing
Network commissioning is the process whereby devices in a mesh network are discovered and
configured for operation. The XBee ZNet 2.5 modules include several features to support device
discovery and configuration. In addition to configuring devices, a strategy must be developed to
place devices to ensure reliable routes.
To accommodate these requirements, the XBee ZNet 2.5 modules include various features to aid
in device placement, configuration, and network diagnostics.
The node discovery command can be used to discover all modules that have joined a network.
Issuing the ND command sends a broadcast node discovery command throughout the network.
All devices that receive the command will send a response that includes the device’s addressing
information, node identifier string (see NI command), and other relevant information. This
command is useful for generating a list of all module addresses in a network.
When a device receives the node discovery command, it waits a random time before sending its
own response. The maximum time delay is set on the ND sender with the NT command. The ND
originator includes its NT setting in the transmission to provide a delay window for all devices in
the network. Large networks may need to increase NT to improve network discovery reliability.
The default NT value is 0x3C (6 seconds).
API devices can send configuration commands to remote modules to set or read the configuration
settings of any device in the network.
For a mesh network installation to be successful, the installer must be able to determine where to
place individual XBee devices to establish reliable links throughout the mesh network.
A good way to measure the performance of a mesh network is to send unicast data through the
network from one device to another to determine the success rate of many transmissions. To
simplify link testing, the modules support a loopback cluster ID (0x12) on the data endpoint
(0xE8). Any data sent to this cluster ID on the data endpoint will be transmitted back to the
sender. This is shown in the figure below:
© 2008 Digi International, Inc.
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