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SX1231
WIRELESS & SENSING PRODUCTS
DC free Data encoding
CRC checksum calculation
AES Enc/Dec
DATASHEET
Preamble
0 to 65535
bytes
Sync Word
0 to 8 bytes
Address
byte
Message
Up to 255 bytes
CRC
2-bytes
Payload
(min 1 byte)
Fields added by the packet handler in Tx and processed and removed in Rx
Optional User provided fields which are part of the payload
Message part of the payload
Figure 33. Fixed Length Packet Format
5.5.2.2. Variable Length Packet Format
Variable length packet format is selected when bit PacketFormat is set to 1.
This mode is useful in applications where the length of the packet is not known in advance and can vary over time. It is then
necessary for the transmitter to send the length information together with each packet in order for the receiver to operate
properly.
In this mode the length of the payload, indicated by the length byte, is given by the first byte of the FIFO and is limited to
255 bytes if AES is not enabled else the message is limited to 64 bytes i.e. max 66 bytes payload if Address byte is
enabled. Note that the length byte itself is not included in its calculation. In this mode, the payload must contain at least 2
bytes, i.e. length + address or message byte.
An illustration of a variable length packet is shown below. It contains the following fields:
?
?
?
?
?
?
Preamble (1010...)
Sync word (Network ID)
Length byte
Optional Address byte (Node ID)
Message data
Optional 2-bytes CRC checksum
DC free Data encoding
CRC checksum calculation
AES Enc/Dec
Preamble
0 to 65535
bytes
Sync Word
0 to 8 bytes
Length
byte
Address
byte
Message
Up to 255 bytes
CRC
2-bytes
Payload
(min 2 bytes)
Fields added by the packet handler in Tx and processed and removed in Rx
Optional User provided fields which are part of the payload
Message part of the payload
Figure 34. Variable Length Packet Format
Rev. 7 - June 2013
Page 54
www.semtech.com
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