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LRI2K Folha de dados(PDF) 35 Page - STMicroelectronics |
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LRI2K Folha de dados(HTML) 35 Page - STMicroelectronics |
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35 / 89 page ![]() LRI2K Request format 35/89 13 Request format The request consists of: ● an SOF ● flags ● a command code ● parameters and data ● a CRC ● an EOF 13.1 Request flags In a request, the "flags" field specifies the actions to be performed by the LRI2K and whether corresponding fields are present or not. The flags field consists of eight bits. The bit 3 (Inventory_flag) of the request flag defines the contents of the 4 MSBs (bits 5 to 8). When bit 3 is reset (0), bits 5 to 8 define the LRI2K selection criteria. When bit 3 is set (1), bits 5 to 8 define the LRI2K Inventory parameters. Table 10. General request format S O F Request flags Command code Parameters Data CRC E O F Table 11. Definitions of request flags 1 to 4 Bit No Flag Level Description Bit 1 Subcarrier_flag(1) 1. Subcarrier_flag refers to the LRI2K-to-VCD communication. 0 A single subcarrier frequency is used by the LRI2K 1 Two subcarriers are used by the LRI2K Bit 2 Data_rate_flag(2) 2. Data_rate_flag refers to the LRI2K-to-VCD communication 0 Low data rate is used 1 High data rate is used Bit 3 Inventory flag 0 The meaning of Flags 5 to 8 is described in Table 12 1 The meaning of Flags 5 to 8 is described in Table 13 Bit 4 Protocol Extension flag 0 No Protocol format extension |
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