Glossary
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Building Technologies 125-202
06/06/2017
Word Description
Pulse Input Used for counting, accumulating, and scaling pulses received from 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. The MD-BMS
and MD-BMED Power Meters can generate pulses based on accumulated value(s) such as system kWh, system kVARh,
and system kVAh.
Rising edge Transition of the input signal from low to high.
RMS Root-Mean-Square. True RMS is the AC voltage/current that produces the equivalent amount of heat in a resistor as a
DC voltage/current, whether sinusoidal or not. The MD Model Power Meter measures 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 BACnet/Modbus/P1.
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 a 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 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 is a message that the MD-BMS and MD-BMED Power Meters must respond to. 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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