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4 Acronyms, abbreviations and definitions
Section 1: Introduction Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual
May 2012 3-9000-771 Rev A
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)
RRadius
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)
Table 1-1 Acronyms, abbreviations and definitions
Acronym or abbreviation Definition