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e Electro Industries/Gauge Tech Doc # E107706 V1.25 Glossary-2
Byte: A group of 8 binary digits processed as a unit by a computer (or device) and
used especially to represent an alphanumeric character.
CBEMA Curve: A voltage quality curve established originally by the Computer Business
Equipment Manufacturers Association. The CBEMA Curve defines voltage
disturbances that could cause malfunction or damage in microprocessor devices.
The curve is characterized by voltage magnitude and the duration which the
voltage is outside of tolerance. (See ITIC Curve.)
Channel: The storage of a single value in each interval in a load profile.
CRC Field: Cyclic Redundancy Check Field (Modbus communication) is an error checksum
calculation that enables a Slave device to determine if a request packet from a
Master device has been corrupted during transmission. If the calculated value
does not match the value in the request packet, the Slave ignores the request.
CT (Current) Ratio: A Current Transformer Ratio is used to scale the value of the current from a
secondary value up to the primary side of an instrument tranformer.
Demand: The average value of power or a similar quantity over a specified period of
time.
Demand Interval: A specified time over which demand is calculated.
Display: User-configurable visual indication of data in a meter.
DNP 3.0: A robust, non-proprietary protocol based on existing open standards. DNP 3.0
is used to operate between various systems in electric and other utility industries
and SCADA networks. Nexus 1250 supports Level 1; Nexus 1252 supports
Level 2.
EEPROM: Nonvolatile memory. Electrically Erasable Programmable Read Only Memory
that retains its data during a power outage without need for a battery. Also
refers to meter’s FLASH memory.
Energy Register: Programmable record that monitors any energy quantity. Example: Watthours,
VARhours, VAhours.
Ethernet: A type of LAN network connection that connects two or more devices on a
common communications backbone. An Ethernet LAN consists of at least one
hub device (the network backbone) with multiple devices connected to it in a
star configuration. The most common versions of Ethernet in use are 10BaseT
and 100BaseT as defined in IEE standards. However, several other versions of
Ethernet are also available.
Exception Response: Error Code (Modbus communication) transmitted in a packet from the Slave to
the Master if the Slave has encountered an invalid command or other problem.