ROC827 Instruction Manual

H

HART

Highway Addressable Remote Transducer.

Holding

Analog output number value to be read.

Register

 

Hw

Differential pressure.

Hz

Hertz.

I, J

IC

Integrated Circuit. Also, Industry Canada (more recently known as Measurement

 

Canada), an organization that grants custody transfer approvals on certain ROC units.

ID

Identification.

IEC

Industrial Electrical Code or International Electrotechnical Commission. See

 

http://www.iec.ch.

IEEE

Institute of Electrical and Electronic Engineers. A professional organization that, in

 

conjunction with the International Standards Organization (ISO), establishes and

 

maintains the Open System Interconnection (OSI) reference model and an international

 

standard for the organization of local area networks (LANs). Refer to http://www.ieee.org.

IMV

Integral Multiplier Value, used in AGA3 (orifice) calculations.

Input

Digital input, a bit to be read.

Input Register

Input numeric value to be read.

Local Port

Also LOI; the serial EIA-232 (RS-232) port on the ROC through which local

 

communications are established, typically for configuration software running on a PC.

I/O

Input/Output.

I/O Module

Module that plugs into an I/O slot on a ROC to provide an I/O channel.

IRQ

Interrupt Request. Hardware address oriented.

ISO

International Standards Organization. See http://www.iso.ch.

IV

Integral Value.

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.

 

 

 

 

Issued Mar-06

Glossary

A-4

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Emerson ROC827 Highway Addressable Remote Transducer, Input Register, Local Port, Kilobytes, KHz KiloHertz