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[FAQ] RF37S114: How do I write to the RF37S114?

Part Number: RF37S114

The RF37S114 ISO15693 transponder requires special handling to write to it. What additional actions need to be taken to successfully write to this transponder?

  • The RF37S114 is based of Texas Instruments' Tag-It HF-I ISO15693 transponder series. The Tag-It portfolio supports commands such as Write Single Block, but require a specific process to correctly write tag data into memory.

    The key step is to set the Option flag bit for the ISO15693 command flags. This is Bit 6 in the command. For software, it is usually appended by OR'ing 0x40 to the current ISO15693 flags.

    When the option flag is selected, the End of Frame marker is not sent immediately by the reader device, but after a delay. Most readers handle this delayed transmission automatically, but in the event you are programming your own reader, then the End of Frame marker needs to be sent after 10 ms has passed from the transmission of the last byte of data.

    Once the 10 ms passes, then the End of Frame can be sent out. When the End of Frame is received by the RF37S114, it will properly write the previous received data into tag memory where it can then be read out by the reader device.