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RF69 Datasheet(PDF) 53 Page - List of Unclassifed Manufacturers |
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RF69 Datasheet(HTML) 53 Page - List of Unclassifed Manufacturers |
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53 / 81 page  RF69 Page 52 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com DC free Data encoding CRC checksum calculation AES Enc/Dec Preamble 0 to 65535 bytes Sync W ord 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 W ord 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 |
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