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STM8SPLNB1 датащи(PDF) 40 Page - STMicroelectronics |
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STM8SPLNB1 датащи(HTML) 40 Page - STMicroelectronics |
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40 / 44 page ![]() DiSEqC™ protocol basics STM8SPLNB1 40/44 DocID018831 Rev 5 A.1.3 Data transfer on coaxial cable The 22 kHz signal is also used for data communication through coaxial cable (bidirectional transfer). In this case is used amplitude modulation of 22 kHz signal. Bit “logical 0” coding: 1.0 ms 22 kHz signal 0.5 ms no signal Bit “logical 0” coding: 0.5 ms 22 kHz signal 1.0 ms no signal By this modulation is transferred full DiSEqC™ message (8 bits per byte + parity, several bytes in message - see A.1: Physical layer). Figure 20. DiSEqC™ bit modulation Figure 21. Timing diagram for typical DiSEqC™ (1.0 version) |
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