Networking Maximum payload
Digi XBee3® 802.15.4 RF Module User Guide
69
5. If you are using encryption, the source addresses are promoted to long source addresses, so
the maximum achievable payload is reduced by 6 bytes.
6. If you are using the long destination address,the maximum achievable payload is reduced by 6
bytes (the difference between the 8 bytes required for a long address and the 2 bytes required
for a short address).
7. If you are using encryption, the maximum achievable payload is reduced by 5 bytes.
Note You can query NP command to determine the maximum achievable payload size based on
current parameters. NP always assumes a long destination address will be used.
Maximum payload summary tables
The following table indicates the maximum payload when using transmit compatibility with Legacy
802.15.4 modules (S1 hardware).
Encryption
Enabled Disabled
95 B 100 B
The following table indicates the maximum payload when using the application header and not using
encryption.Increment the maximum payload in 2 bytes if you are not using the application header.
Destination address
Source address Short Long
Short 114 B 108 B
Long 108 B 102 B
The following table indicates the maximum payload when using the application header andusing
encryption.Increment the maximum payload in 4 bytes if you are not using the application header.
Destination address
Source address Short Long
Short 101 B 95 B
Long 101 B 95 B
Working with Legacy devices
The Legacy 802.15.4 module (S1 hardware) transmits packets one by one. It does not transmit a
packet until it receives all expected acknowledgments of the previous packet or the timeout expires.
The XBee/XBee-PRO S2C 802.15.4 and XBee3 802.15.4 RF Modules enhance transmission by
implementing a transmission queue that allows the device to transmit to several devices at the same
time. Broadcast transmissions are performed in parallel with the unicast transmissions.
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