Device Addressing

• IEC 870-5-101

  • Link address can be 0, 1, or 2 bytes
  • Unbalanced link always contains the slave address (destination of primary messages, source of secondary messages)
  • Balanced link is point to point only, so link address is optional (but may be included for security). The application layer address identifies data.
  • Link addressing prevents peer to peer network of more than 2 devices

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Slide 19 of 30

The DNP concept of "peer-to-peer" operation where pairs of devices may swap "master" and "slave" roles does not appear to have a parallel in the IEC profiles.