Specifications
XBee®/XBee‐PRO®SERFModules
©2009DigiInternational,Inc. 101
Frame Fields Offset Example Description
A
P
I
P
a
c
k
e
t
Start Delimiter 00x7E
Length MSB 1 0x00
Number of bytes between the length and the checksum
Frame-specific Data
LSB 2 0x17
Frame Type 30x11
Frame ID 40x01
Identifies the UART data frame for the host to correlate
with a subsequent transmit status. If set to 0, no transmit
status frame will be sent out the UART.
64-bit Destination
Address
MSB 5 0x00
64-bit address of the destination device (big endian byte
order). For unicast transmissions, set to the 64-bit
address of the destination device, or to
0x0000000000000000 to send a unicast to the
coordinator. Set to 0x000000000000FFFF for broadcast.
60x00
70x00
80x00
90x00
10 0x00
11 0xFF
LSB 12 0xFF
16-bit Destination
Network Address
MSB 13 0xFF 16-bit address of the destination device (big endian byte
order). Set to 0xFFFE for broadcast, or if the 16-bit
address is unknown.
LSB 14 0xFE
Source Endpoint 15 0x00
Set to 0x00 for ZDO transmissions (endpoint 0 is the
ZDO endpoint).
Destination Endpoint 16 0x00
Set to 0x00 for ZDO transmissions (endpoint 0 is the
ZDO endpoint).
Cluster ID
MSB 17 0x00 Set to the cluster ID that corresponds to the ZDO
command being sent.
0x0005 = Active Endpoints Request
LSB 18 0x05
Profile ID
MSB 19 0x00
Set to 0x0000 for ZDO transmissions (Profile ID 0x0000
is the ZigBee Device Profile that supports ZDOs).
LSB 20 0x00
Broadcast Radius 21 0x00
Sets the maximum number of hops a broadcast
transmission can traverse. If set to 0, the transmission
radius will be set to the network maximum hops value.
Transmit Options 22 0x00 All bits must be set to 0.
Data Payload
Transaction Sequence
Number
23 0x01
The required payload for a ZDO command. All multi-byte
ZDO parameter values (u16, u32, 64-bit address) must
be sent in little endian byte order.
The Active Endpoints Request includes the following
payload:
[16-bit NwkAddrOfInterest]
Note the 16-bit address in the API example (0x1234) is
sent in little endian byte order (0x3412).
ZDO Payload
24 0x34
25 0x12
Checksum 26 0xA6
0xFF minus the 8 bit sum of bytes from offset 3 to this
byte.