XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 78
XBee-PRO 900HP Link Reliability
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.
Network Link Testing
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:
The configuration steps to send data to the loopback cluster ID depend on the AP setting:
AT Configuration (AP=0)
To send data to the loopback cluster ID on the data endpoint of a remote device, set the CI command value to
0x12. The SE and DE commands should be set to 0xE8 (default value). The DH and DL commands should be
set to the address of the remote. After exiting command mode, any received serial characters will be
transmitted to the remote device, and returned to the sender.
API Configuration (AP=1 or AP=2)
Send an Explicit Addressing ZigBee Command API frame (0x11) using 0x12 as the cluster ID and 0xE8 as the
source and destination endpoint. Data packets received by the remote will be echoed back to the sender.
Link Testing Between Adjacent Devices
It is often advantageous to test the quality of a link between two adjacent nodes in a network. The Test Link
Request Cluster ID can be used to send a number of test packets between any two nodes in a network.
A link test can be initiated using an Explicit TX Request frame. The command frame should be addressed to
the Test Link Request Cluster ID (0x0014) on destination endpoint 0xE6 on the radio which should execute the
test link. The Explicit TX Request frame should contain a 12 byte payload with the following format:
Number of Bytes
Field Name Description
8
Destination address
The address with which the radio
should test its link
2
Payload size
The size of the test packet. (The
maximum payload size for this radio
can be queried with the NP command.)
2
Iterations
The number of packets which should
be sent. This should be a number
between 1 and 4000.
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