<![CDATA[DLMS Communication Port Protection (Class 65 - Parameter Monitor)]]>Detecting Physical Meter Tampering and Unauthorized Parameter Modifications

Class 65 (Parameter Monitor) tracks changes to critical metrological and security registers.

Monitored Attributes

  • Attribute 2 (changed_parameters): Array of OBIS codes modified since last security audit.
  • Attribute 3 (last_change_time): Timestamp of the latest parameter write.
  • Attribute 4 (change_counter): Monotonically increasing 32-bit counter incremented on every valid SET or ACTION request.

If the change_counter increments without a corresponding job logged in the utility Head-End System audit trail, an immediate on-site investigation is dispatched!

]]>https://dlms.sharur.org/topic/24/dlms-communication-port-protection-class-65-parameter-monitorRSS for NodeFri, 16 Oct 2026 19:50:08 GMTSat, 22 Aug 2026 12:33:41 GMT60<![CDATA[Reply to DLMS Communication Port Protection (Class 65 - Parameter Monitor) on Sat, 22 Aug 2026 12:38:22 GMT]]>Parameter changes are also duplicated to write-once non-volatile metrological EEPROM to comply with MID (Measuring Instruments Directive) legal metrology requirements.

]]>https://dlms.sharur.org/post/108https://dlms.sharur.org/post/108Sat, 22 Aug 2026 12:38:22 GMT<![CDATA[Reply to DLMS Communication Port Protection (Class 65 - Parameter Monitor) on Sat, 22 Aug 2026 12:38:12 GMT]]>In conjunction with terminal cover removal switches (0.0.96.11.0.255 Event Log), Class 65 parameter monitoring provides ironclad tamper detection across substation distribution points.

]]>https://dlms.sharur.org/post/107https://dlms.sharur.org/post/107Sat, 22 Aug 2026 12:38:12 GMT