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Glossary
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Siemens Industry, Inc. 125-201
09/30/2019
Glossary
Word Description
Amp Multiplier A multiplier that changes amperage so that a meter can read higher
measurements.
Analog Value A type of BACnet object that is a floating point number. On the MD-P1 and MD-
P1D Model Power Meters, Analog Value objects are used to represent the
electrical measurements.
BACnet B uilding A utomation C ontrol net works. A communications protocol that allows
building automation and control devices and their association properties
(objects) to be automatically discovered.
CAM C lear A ll M easurements
Data Scalar A scalar is used to multiply the raw data value to convert information read from
the registers
Demand Window
The Demand Window is how long the meter calculates your demand for
recording a value. For example if your Demand Window is set to 15 minutes,
the meter will calculate your total demand every minute for 15 minutes. At the
end of the 15 minutes it will sum all 15 values, and then record that value as the
demand.
Digital Output The MD-P1 and MD-P1D Power Meters have an output port. The port can be
used to output kWh, kVARh, or kVAh pulses to external devices, or to toggle on
and off to control a remote device or relay.
Discovery In BACnet, devices and the objects they expose can be found through a
discovery process. This means that devices and objects do not need to be
manually added if a BACnet client supports discovery.
Falling edge Transition of the input signal from high to low.
Hexadecimal In mathematics and computer science, hexadecimal (or hex) is a numeral
system with a radix, or base, of 16. It uses sixteen distinct symbols, most often
the symbols 0 to 9 to represent values zero to nine, and A, B, C, D, E, F (or a
through f) to represent values ten to fifteen.
kVAh Kilovolt-Ampere Hour
kVARh Kilovolt Ampere Reactive Hours
kWh Kilowatt Hour
LSW (Modbus mode only) Least Significant Word. Unit of data with the low-order
bytes at the right.
MS/TP Master-Slave/Token Passing is a model of communication used by BACnet
where one device (the master node) has unidirectional control of the RS-485
serial bus. The token is passed from master node to master node to allow a
master node to send frames over the bus.
MSW (Modbus mode only) Most Significant Word. Unit of data with the high-order
bytes at the left.