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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SRI4K датащи(PDF) 19 Page - STMicroelectronics |
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SRI4K датащи(HTML) 19 Page - STMicroelectronics |
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19 / 45 page  SRI4K SRI4K operation 19/45 5 SRI4K operation All commands, data and CRC are transmitted to the SRI4K as 10-bit characters using ASK modulation. The start bit of the 10 bits, b0, is sent first. The command frame received by the SRI4K at the antenna is demodulated by the 10% ASK demodulator, and decoded by the internal logic. Prior to any operation, the SRI4K must have been selected by a Select command. Each frame transmitted to the SRI4K must start with a start of frame, followed by one or more data characters, two CRC bytes and the final end of frame. When an invalid frame is decoded by the SRI4K (wrong command or CRC error), the memory does not return any error code. When a valid frame is received, the SRI4K may have to return data to the reader. In this case, data is returned using BPSK encoding, in the form of 10-bit characters framed by an SOF and an EOF. The transfer is ended by the SRI4K sending the 2 CRC bytes and the EOF. |
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