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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SRT512 датащи(PDF) 20 Page - STMicroelectronics |
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SRT512 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 46 page  SRT512 operation SRT512 20/46 Doc ID 13277 Rev 4 5 SRT512 operation All commands, data and CRC are transmitted to the SRT512 as 10-bit characters using ASK modulation. The start bit of the 10 bits, b0, is sent first. The command frame received by the SRT512 at the antenna is demodulated by the 10% ASK demodulator, and decoded by the internal logic. Prior to any operation, the SRT512 must have been selected by a Select command. Each frame transmitted to the SRT512 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 SRT512 (wrong command or CRC error), the memory does not return any error code. When a valid frame is received, the SRT512 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 SRT512 sending the 2 CRC bytes and the EOF. |
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