B-38
TERM DEFINITION
Raw Mix Liquids
A mixture of natural gas liquids that has not been fractionated or separated into
its various components.
RBUS
Communication abbreviation for Results Bus.
RCV
Communication abbreviation for Received.
RD
Acronym for Relative Density.
RDrive
Refers to Totalflow’s SRam Drive (solid state memory chip) located on the main
board, used to store data and configuration files. The RDrive is a lithium
backed, volatile memory chip and is not affected by a warm start.
Read Only Memory
Computer memory in which data can be routinely read but written to only once
using special means when the ROM is manufactured. ROM is used for storing
data or programs (e.g. operating systems) on a permanent basis.
Real Time
Data acted upon immediately instead of being accumulated and processed at a
later time.
Real Time Data Base
The iVision SCADA system has an in-memory RTDB for the data it collects
from various devices. Real-time generally means that the data is acquired often
enough that the user can make operational changes to the process while it is
still useful to do so. On a factory floor, this can be in milliseconds. For remote
devices which may require a couple of hours of drive time to reach, real-time
can be thought of in tens of minutes or even hours. The iVision data base can
meet either of these requirements.
Real Time Operating
System
Any operating system where interrupts are guaranteed to be handled within a
certain specified maximum time, thereby making it suitable for control of
hardware in embedded systems and other time-critical applications. RTOS is
not a specific product but a class of operating system.
Recharge/Charge
The conversion of electrical energy, provided in the form of a current from an
external source (charger), into chemical energy within a cell/battery.
Recommended Standard
232
This is the standard interface for full-duplex data communication conducted
with two way independent channels. It employs unbalanced signaling and
refers to point-to-point communications between one driver and one receiver in
a 4-wire bus system.
The RS-232 (single-ended) transmits at a relatively slow data rate (up to 20K
bits per second) and short distances (up to 50 Ft. @ the maximum data rate).
Recommended Standard
422
This is the standard interface for half-duplex communications conducted with a
dual-state driver. It employs balanced signaling and refers to multi-drop
communications between one driver and up to ten receivers, known as
“straight-through” cabling in a 4-wire bus system.
The RS-422 (Differential) transmits a much faster data rate (up to 100K bits per
second) and longer distances (up to 4000 Ft. @ the maximum data rate).
Recommended Standard
485
This is the standard interface for half-duplex communications conducted in the
tri-state or common mode. It employs balanced signaling and refers to true
multi-point communications between up to 32 drivers and 32 receivers, in 2-
wire bus system.
The RS-485 (Differential) transmits a much faster data rate (up to 100K bits per
second) and longer distances (up to 4000 Ft. @ the maximum data rate). It also
supports more nodes per line because it uses lower impedance drivers and
receivers.
Record
A collection of unrelated information that is treated as a single unit.
Register
A storage device with a specific capacity, such as a bit, byte or word.
Relay
Electromechanical device containing a coil and set of contacts. The contacts
close when the coil is activated.
Remote
Not hard-wired; communicating via switched lines, such as telephone lines.
Usually refers to peripheral devices that are located a site away from the CPU.
Summary of Contents for XRC6490
Page 1: ...2100802 001 AB TOTALFLOW XSeries Remote Controller User s Manual ...
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Page 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Page 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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Page 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
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Page 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
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