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ROC800-Series Instruction Manual
Revised Jul-14
Glossary
A-5
K
KB
Kilobytes.
kHz
KiloHertz.
L
LCD
Liquid Crystal Display.
LDP
Local Display Panel, a display-only device that plugs into ROC300-Series units (via a
parallel interface cable) used to access information stored in the ROC.
LED
Light-Emitting Diode.
Logical Number
The point number the ROC and ROC Plus protocols use for I/O point types are based
on a physical input or output with a terminal location; the point numbers for all other
point types are “logical” and are simply numbered in sequence.
LNK
Ethernet has linked.
LOI
Local Operator Interface (or Local Port). Refers to the serial EAI-232 (RS-232) port on
the ROC through which local communications are established, typically for
configuration software running on a PC.
LPM
Lightning Protection Module; a device that provides lightning and power surge
protection for ROCs.
LRC
Longitudinal Redundancy Checking error checking.
M
m
Meter.
mA
Milliamp(s); one thousandth of an ampere.
MAC Address
Media Access Control Address; a hardware address that uniquely identifies each node
of a network.
Manual mode
For a ROC, indicates that the I/O scanning has been disabled.
MAU
Medium Attachment Unit.
MCU
Master Controller Unit.
Modbus
A popular device communications protocol developed by Gould-Modicon.
MPU
Micro-Processor Unit.
mm
Millimeter.
MMBTU
Million British Thermal Units.
msec
Millisecond, or 0.001 second.
MVS
Multi-Variable Sensor. A device that provides differential pressure, static pressure, and
temperature inputs to a ROC for orifice flow calculations.
mV
Millivolts, or 0.001 volt.
mW
Milliwatts, or 0.001 watt.
N
NAP
Network Access Point; the point in the distributed RTU network at which ROCLINK 800
NEC
National Electrical Code.
NEMA
National Electrical Manufacturer’s Association. See
http://www.nema.org .