XBee®/XBee‐PRO® ZB SMT RF Modules
ZigBee Device Objects (ZDO)
The ZigBee Device Objects (ZDO) is supported to some extent on all ZigBee devices. The ZDO is an endpoint
that implements services described in the ZigBee Device Profile in the ZigBee specification. Each service has an
assigned cluster ID, and most service requests have an associated response. The following table describes some
common ZDO services.
Cluster Name Cluster ID Description
Network Address 0x0000
Request
Request a 16-bit address of the
radio with a matching 64-bit
address (required parameter).
Active Endpoints 0x0005
Request
Request a list of endpoints from a
remote device.
LQI Request
0x0031
0x0032
Request data from a neighbor table
of a remote device.
Routing Table
Request
Request to retrieve routing table
entries from a remote device.
Network Address 0x8000
Response
Response that includes the 16-bit
address of a device.
LQI Response
0x8031
0x8032
Response that includes neighbor
table data from a remote device.
Routing Table
Response
Response that includes routing
table entry data from a remote
device.
Refer to the ZigBee specification for a detailed description of all ZigBee Device Profile services.
Sending a ZDO Command
To send a ZDO command, an explicit transmit API frame must be used and formatted correctly. The source and
destination endpoints must be set to 0, and the profile ID must be set to 0. The cluster ID must be set to match
the cluster ID of the appropriate service. For example, to send an active endpoints request, the cluster ID must
be set to 0x0005.
The first byte of payload in the API frame is an application sequence number (transaction sequence number)
that can be set to any single byte value. This same value will be used in the first byte of the ZDO response. All
remaining payload bytes must be set as required by the ZDO. All multi-byte values must be sent in little endian
byte order.
Receiving ZDO Commands and Responses
In XBee ZB firmware, ZDO commands can easily be sent using the API. In order to receive incoming ZDO
commands, receiver application addressing must be enabled with the AO command. (See examples later in this
section.) Not all incoming ZDO commands are passed up to the application.
When a ZDO message is received on endpoint 0 and profile ID 0, the cluster ID indicates the type of ZDO
message that was received. The first byte of payload is generally a sequence number that corresponds to a
sequence number of a request. The remaining bytes are set as defined by the ZDO. Similar to a ZDO request,
all multi-byte values in the response are in little endian byte order.
Example 1: Send a ZDO LQI Request to read the neighbor table contents of a remote.
Looking at the ZigBee specification, the cluster ID for an LQI Request is 0x0031, and the payload only
requires a single byte (start index). This example will send an LQI request to a remote device with a 64-bit
address of 0x0013A200 40401234. The start index will be set to 0, and the transaction sequence number
will be set to 0x76
API Frame:
7E 0016 11 01 0013A200 40401234 FFFE 00 00 0031 0000 00 00 76 00 CE
0x0016 - length
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