High and Low-frequency Radio Frequency Identification Systems (RFID)

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The standard commands between the read/write module and the transponder covered by Contrinex are the following: Compulsory Optional commands Name of function Inventory Stay quiet Read single bloc Write single block Lock block Select Reset to ready Write AFI Lock AFI Write DSFID Lock DSFID Get system information Commands Meaning After the anticollision sequence, the transponder returns the DSFID and UID Puts the transponder in the rest state Reads the specified block & returns its value Writes the specified data in the specified block Write protects the specified block permanently Puts the transponder concerned into "selected" mode Puts the transponder concerned into "ready" mode Writes the AFI value in the configuration memory of the transponder Blocks the AFI value definitely Writes the DSFID value in the configuration memory of the transponder Blocks the DSFID definitely Returns system information, such as memory size, IC reference, etc. Start and end of the frame sent by the Read/write module Each frame sent by the read/write module starts with start of frame (SOF) and terminates with end of frame (EOF). The start of frame determines the type of information encoding. For the HF ConID RFID system: frame time time communication between read/write modules and tags (Standard options chosen by Contrinex.) Modulation − Carrier frequency: 13.56 MHz ± 7 kHz − ASK (Amplitude-Shift Keying) modulation at 100% time time Information encoding − 1 out of 4: two bits are encoded at the same time − Data transfer rate: 26.48 kbit/s communication between tags and read/write modules Modulation Minimum modulation amplitude per load: 10 mV. 10 mV time time time time time Subcarrier Simple subcarrier with a high data transfer rate: 26.48 kbit/s. Encoding Bit encoding with simple subcarrier. Data transfer rate: 26.48 kbit/s. 42 Detailed data sheets for these products can be found on the Contrinex website:
Start and end of frame sent by transponder The frames returned by the transponder are also demarcated by start of frame (SOF) and end of frame (EOF). 8 pulses 8 pulses time time Start of frame: End of frame: 8 pulses 423.75 kHz 24 pulses 423.75 kHz 24 pulses 8 pulses time time Low frequency High frequency www.contrinex.com 43
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High and Low-frequency Radio Frequency Identification Systems (RFID)

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