DLMS Communication Port Protection (Class 65 - Parameter Monitor)
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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_counterincrements without a corresponding job logged in the utility Head-End System audit trail, an immediate on-site investigation is dispatched! - Attribute 2 (
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In conjunction with terminal cover removal switches (
0.0.96.11.0.255Event Log), Class 65 parameter monitoring provides ironclad tamper detection across substation distribution points. -
Parameter changes are also duplicated to write-once non-volatile metrological EEPROM to comply with MID (Measuring Instruments Directive) legal metrology requirements.
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