Section 1: Introduction

Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual

May 2012

3-9000-771 Rev A

 

 

Table 1-1 Acronyms, abbreviations and definitions

Acronym or abbreviation

Definition

P/N

part number

 

 

PS

power supply (board)

 

 

psi

pounds per square inch (pressure unit)

 

 

psia

pounds per square inch absolute (pressure unit)

 

 

psig

pounds per square inch gage (pressure unit)

 

 

R

Radius

 

 

rad

radian (angle)

 

 

RAM

Random Access Memory

 

 

RTS

Request-to-Send; the RS-232C handshaking signal output by a receiver when it is

 

ready to receive data

 

 

RTU MODBUS

A Modbus protocol framing format in which elapsed time between received charac-

 

ters is used to separate messages. RTU stands for Remote Terminal Unit.

 

 

s

second (time unit, metric)

 

 

SDRAM

Synchronous Dynamic Random Access Memory

 

 

sec

second (time unit, u.s. customary)

 

 

TCP/IP

Transmission Control Protocol/Internet Protocol

 

 

time_t

seconds since Epoch (00:00:00 UTC Jan. 1, 1970) (time unit)

 

 

UDP

User Datagram Protocol

 

 

U.L.

Underwriters Laboratories, Inc. - product safety testing

 

and certification organization

 

 

V

Volts (electric potential unit)

 

 

W

Watts (power unit)

 

 

4

Acronyms, abbreviations and definitions