8–20 PQM POWER QUALITY METER – INSTRUCTION MANUAL
DNP 3.0 PROTOCOL CHAPTER 8: DNP COMMUNICATIONS
This point is used to reconstruct voltage values from the 1,000ths per-unit quantities given in the
other points. Multiply the particular point by this one, and divide by 1000 to get volts. Since some
SCADA systems don’t read 32 bit values, you can also multiply the VT ratio and nominal secondary
(both of which are 16 bit) in the master in cases where the nominal primary may exceed 32767 volts.
** This point is used to reconstruct power values from the 1,000ths per-unit quantities given in the other
points. Multiply the particular point by this one, and divide by 1000 to get VA, kW or kvar.
In Modbus, the current keypress is reported with format code F6. In order to fit the value into a six-
teen-bit signed value, F8 is used in DNP, with ASCII zero (49 decimal) returned when no key is
pressed.
Courtesy of NationalSwitchgear.com
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