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GLOSSARY
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 Power Patrol, 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 associated properties (objects) to
be automatically discovered.
CAM
Cl
ear
A
ll
M
easurements
Data Scalar
A scalar is used to multiply the raw data value to convert information read from the
Modbus registers. Refer to Table IV-3 for a list of values. Example: if the scalar value
in register 44602 is set to 3 and the total true power for the system (kW) is read from
Modbus register 44003 (Offset 4002) and a value of 3465 is returned, the true
system kW is:
3465 X 0.1 = 346.5 kW
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 min, 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. Then it will record that value as the demand.
Digital Output
The Power Patrol meter has an output port for each element. The ports 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
0–9 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.
Net
When a register/object has the word “net” in its description than net equals the sum
