108
MSW (Modbus mode only) Most Significant Word. Unit of data with the high-order bytes
Net When a register/object has the word “net” in its description than net equals the sum
of all individual signed measurements.
Object A BACnet object is a standard data structure that on the PowerScout represents
Power Factor The power factor of the AC electric power system is defined as the ratio of the real
power flowing to the load to the apparent power, and is a number between 0 and 1
(frequently expressed as a percentage, e.g., 0.5 pf = 50% pf). Real power is the
capacity of the circuit for performing work in a particular time. Apparent power is
the product of the root mean squared current and root mean squared voltage of the
circuit. Due to energy stored in the load and returned to the source, or due to a non-
linear load that distorts the wave shape of the current drawn from the source, the
apparent power can be greater than the real power.
Pulse Input Used for counting, accumulating, and scaling pulses received from non-DENT
external pulse initiating meters such as gas, water, or other electrical meters.
Pulse Output Pulse output is used to generate
pulses for external devices such as data loggers that
can accept pulses but do not have Modbus capability. The PowerScout can generate
pulses based on accumulated value(s) such as system kWh, system kVARh, and
Transition of the input signal from low to high.
RMS Root-Mean-Square. True RMS is the AC voltage/current that produces the equiva
amount of heat in a resistor as a DC voltage/current, whether sinusoidal or not. All
DENT Instruments meters measure true RMS.
RS-485 EIA-485 is used as the physical layer underlying many standard and proprietary
automation protocols used to implement Industrial Control Systems, including
RTU
A Remote Terminal Unit (RTU) is a microprocessor controlled electronic device which
interfaces objects in the physical world to a distributed control system or SCADA
system by transmitting telemetry data to the system and/or altering the state of
connected objects based on control messages received from the system.
SCADA SCADA stands for Supervisory Control And Data Acquisition. It generally refers to an
industrial control system: a computer system monitoring and controlling a process.
Service A BACnet service are messages to which the PowerScout must respond and end. In
BACnet these include WhoIs, I-Am, and ReadProperty.
Volts Multiplier A multiplier that changes voltage so that a meter can read measurements higher
than 600V.
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