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RFM95 Datasheet(PDF) 67 Page - HOPE Microelectronics CO., Ltd. |
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RFM95 Datasheet(HTML) 67 Page - HOPE Microelectronics CO., Ltd. |
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67 / 121 page  Page 67 RFM95/96/97/98(W) Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET CONTROL DIO0 DIO1 DIO2 DIO3 DIO4 DIO5 Data Rx Tx SYNC RECOG. PACKET HANDLER FIFO (+SR) SPI NSS SCK MOSI MISO Figure 32. Packet Mode Conceptual View Note The Bit Synchronizer is automatically enabled in Packet mode. 4.2.13.2. Packet Format Fixed Length Packet Format Fixed length packet format is selected when bit PacketFormat is set to 0 and PayloadLength is set to any value greater than 0. In applications where the packet length is fixed in advance, this mode of operation may be of interest to minimize RF overhead (no length byte field is required). All nodes, whether Tx only, Rx only, or Tx/Rx should be programmed with the same packet length value. The length of the payload is limited to 2047 bytes. The length programmed in PayloadLength 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 below. It contains the following fields: Preamble (1010...) Sync word (Network ID) Optional Address byte (Node ID) Message data Optional 2-bytes CRC checksum |
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