Network commissioning and diagnostics Device discovery
Digi XBee® 3 Zigbee® RF Module
133
misleading in Zigbee networks. The DB value only indicates the received signal strength of the last
hop. If a transmission spans multiple hops, the DB value provides no indication of the overall
transmission path, or the quality of the worst link; it only indicates the quality of the last link.
Determine the DB value in hardware using the RSSI/PWM device pin (Micro pin 7/SMT pin 7/TH pin 6).
If you enable the RSSI PWM functionality (P0 command), when the device receives data, it sets the
RSSI PWM to a value based on the RSSI of the received packet (this value only indicates the quality of
the last hop). You could connect this pin to an LED to indicate if the link is stable or not.
Device discovery
Network discovery
Use the network discovery command to discover all devices that have joined a network. Issuing the
ND command sends a broadcast network discovery command throughout the network. All devices
that receive the command send a response that includes:
n Device addressing information
n Node identifier string (see NI (Node Identifier))
n Other relevant information
You can use this command for generating a list of all module addresses in a network.
ZDO discovery
The Zigbee device profile includes provisions to discover devices in a network that are supported on all
Zigbee devices (including non-Digi products). These include the LQI Request (cluster ID 0x0031) and
the Network Update Request (cluster ID 0x0038). You can use the LQI Request to read the devices in
the neighbor table of a remote device, and the Network Update Request for a remote device to
complete an active scan to discover all nearby Zigbee devices. You can send both of these ZDO
commands using the Explicit Addressing Command frame - 0x11. For more information, see API
Operation. Refer to the Zigbee specification for formatting details of these two ZDO frames.
Joining Announce
All Zigbee devices send a ZDO Device Announce broadcast transmission when they join a Zigbee
network (ZDO cluster ID 0x0013). These frames are sent out the device's serial port as an Explicit Rx
Indicator frame - 0x91 if AOis set to 1.
The device announce payload includes the following information:
[Sequence Number] + [16-bit address] + [64-bit address] + [Capability]
The 16-bit and 64-bit addresses are received in little-endian byte order (LSB first). See the Zigbee
specification for details.
Any received Network Address Requests (ZDO cluster ID 0x0000) and IEEE Address Request (ZDO
Cluster ID 0x0001) will also be emitted if AO is set to 1.
Commissioning pushbutton and associate LED
XBee devices support a set of commissioning pushbutton and LED behaviors to aid in device
deployment and commissioning. These include the commissioning push button definitions and
associate LED behaviors. The following features can be supported in hardware:
To Next Page
Loading...
Need help?
General
