Emerson ROC827 MAC Address, Manual mode, Modbus, Msec, Off-line, Ohms, On-line, Opcode, Operator

	ROC827 Instruction Manual
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
NEC	National Electrical Code.
NEMA	National Electrical Manufacturer’s Association. See http://www.nema.org.
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” refers to configuring an electronic file that is later loaded
	into a ROC.
Ohms	Units of electrical resistance.
On-line	Accomplished while connected (by a communications link) to the target device. For
	example, “on-line configuration” refers to configuring a ROC800-Series unit while
	connected to it, so that you can view the current parameter values and immediately load
	new values.
Opcode	Type of message protocol the ROC uses to communicate with the configuration software,
	as well as host computers with ROC driver software.
Operator	Also LOI or Local Port; the serial EIA-232 (RS-232) port on the ROC through which local
Interface	communications are established, typically for configuration software running on a PC.
Orifice meter	A meter that records the flow rate of gas through a pipeline. The flow rate is calculated
	from the pressure differential created by the fluid passing through an orifice of a particular
	size and other parameters.
P, Q
Parameter	A property of a point that typically can be configured or set. For example, the Point Tag
	ID is a parameter of an Analog Input point. Parameters are normally edited by using
	configuration software running on a PC.
PC	Personal Computer.
Pf	Flowing pressure.
Issued Mar-06	Glossary	A-5