ROC364 Instruction Manual
G-3 Glossary Rev Jun/05
I, J
I/O – Input/Output.
I/O Module – Module that plugs into an I/O slot on a ROC to provide an I/O channel.
IEC – Industrial Electrical Code.
K
Kbytes – Kilobytes.
kHz – Kilohertz.
L
LCD – Liquid Crystal Display. Display only device used for reading data.
LDP – Local Display Panel. A display-only device that plugs into a ROC unit via a parallel interface
cable. The LDP consists of a 4-line by 20-character alphanumeric display and four keys used to
access information stored by the ROC.
LED – Light-emitting diode.
LOI – Local Operator Interface. Refers to the serial EIA-232 (RS-232) port on the ROC through which
local communications are established, typically for configuration software running on a PC.
LPM – Lighting Protection Module provides lightning and power surge protection for ROC units that
use I/O Modules.
M
mA – Milliamp(s); one thousandth of an ampere.
MCU – Master Controller Unit.
Modbus – A popular device communications protocol developed by Gould-Modicon.
Modular I/O – I/O channels that are provided on a ROC by means of I/O modules. See I/O Module.
MPU – Micro-processor Unit.
mW – Milliwatts, or 0.001 watt.
mV – Millivolts, or 0.001 volt.
MVS – Multi-Variable Sensor. The MVS provides differential pressure, static pressure, and temperature
inputs for orifice flow calculation.
N
NEC – National Electrical Code.
NEMA – National Electrical Manufacturer’s Association.
O
OH – Off-Hook modem communications signal.
Off-line – Accomplished while the target device is not connected (by a communications link). For
example, off-line configuration is configuring a ROC in a electronic file that is later loaded into the
ROC.
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