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SX1210
ADVANCED COMMUNICATIONS & SENSING
The length stored in this register relates only to the payload which includes the message and the optional address
byte. In this mode, the payload must contain at least one byte, i.e. address or message byte.
An illustration of a fixed length packet is shown in Figure 34. It contains the following fields:
Preamble (1010...).
Sync word (Network ID).
Optional Address byte (Node ID).
Message data.
Optional 2-bytes CRC checksum.
Optional DC free data decodin g
CRC checksum calculation
Preamble
1 to 4 bytes
Sync Word
1 to 4 bytes
Address
byte
Message
0 to (FIFO size) bytes
CRC
2-bytes
Payload/FIFO
Fields processed and removed by the packet handler
Optional User provided fields which are part of the payload
Message part of the payload
Figure 34: Fixed Length Packet Format
5.5.2.2. Variable Length Packet Format
This mode is necessary 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 in Figure 35, is given by the first byte of the
FIFO and is limited only by the size (width of 8bits) of the FIFO selected. 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 in Figure 35. 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.
Rev 2– Sept 8 , 2008
th
Page 42 of 73
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