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SD card based RTU

  • US 9,836,426 B2
  • Filed: 08/04/2015
  • Issued: 12/05/2017
  • Est. Priority Date: 08/04/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining, by processing circuitry of a remote terminal unit (RTU), that a portable storage medium (PSM) is coupled to the processing circuitry;

    refraining from accessing function code stored in a specified folder of the PSM at least until a determination is made that the processing circuitry is authorized to access information stored on the PSM, the determination based on a relationship between (i) a public key stored in an on-chip memory disposed on a same chip as the processing circuitry and (ii) a private key stored in the PSM; and

    in response to determining that the processing circuitry is authorized to access the information stored on the PSM, performing a specified function corresponding to the function code by executing the function code;

    wherein the RTU comprises a slot configured to physically receive the PSM and electrically couple the PSM to the processing circuitry.

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