Security features for an integral PLC modem

Security features for an integral PLC modem

  • CN 1,620,792 A
  • Filed: 12/04/2002
  • Published: 05/25/2005
  • Est. Priority Date: 12/18/2001
  • Status: Active Application
First Claim
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1. method, it comprises:

  • Receive connection request becoming in whole a kind of modulator-demodulator with a kind of programmable logic controller, this connection request comprises password;

    Contrast the password list that is comprised in the memory of this programmable logic controller processor and verify this password;

    Obtain a call-back telephone number from the memory of this programmable logic controller processor;

    Connect with this call-back telephone number;

    AndPermission is by this programmable logic controller of modem access.

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