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RF96 Folha de dados(PDF) 68 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Folha de dados(HTML) 68 Page - HOPE Microelectronics CO., Ltd. |
68 / 121 page Page 68 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET Optional DC free data coding CRC checksum calculation Preamble 0 to 65536 bytes Sync Word 0 to 8 bytes Address byte Message Up to 2047 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 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. 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 |
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