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Does the PM8000 modbus register list contain points for line-to-line Total Harmonic Distortion?
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On the default configuration of the PM8000, those three registers present line-to-line voltage THD when the meter is configured for DELTA volts mode and present line-to-neutral in all other volts mode configurations.
However, the PM8000 is incredibly flexible and users can either re-map existing modbus registers to alternate values and/or create custom modbus register mappings. The default template for PM8000 already includes three Harmonics Measurement (HME) modules preconfigured for line-to-line. The outputs of these or other HME modules can be mapped to modbus addresses with a simple configuration.
UPDATE: I just found that there are already 3 default modbus registers for 10minute line-to-line voltage THD: 40122, 40124, and 40126 (all are FLOAT32 format) in the default configuration.