Appendix; List Of Abbreviations - ABB RS485 Installation And Startup Manual

8

Appendix

8.1 List of abbreviations

ASCII
Baud rate
Bit
Bus
Byte
Chassis or Chassis Ground A connection to an electrically conductive housing or frame
Coil
Common
CRC
CTS
Earth or Earth Ground
Ground Voltage reference point of a circuit
Handshaking
Hexadecimal or HEX
HMI
Industrial
Industrial
20 - Appendix  RS485
American Standard Code for Information Interchange
Unit for measuring transmission speed in bits/s;
A binary digit, representing a one or zero
An electrical circuit over which data is transmitted
A whole number value represented by eight bits (0 to 255)
of a device. It may or may not be connected to Earth
Ground.
The telegram structure for Modbus transmission is
implemented in registers (WORD) or coils (bits). A coil may
be either 8 or 16 bits in length.
The voltage reference point of a circuit. It may or may not be
connected to earth ground, though it is generally assumed to
be at zero volts, unless otherwise indicated. In floating
circuits, the common is sometimes at a relatively high
potential. This term is sometimes used interchangeably with
the term "Ground" or GND.
Cyclic Redundancy Check. Complex error checking on a
message block.
ClearToSend hardware handshaking signal. Used with
RequestToSend.
Global zero voltage reference point. Physical connection is
made to the earth through a grounding rod, water pipe or
other reliable connection.
It may or may not be connected to earth ground, though it is
generally assumed to be at zero volts. Sometimes used
interchangeably with the term "Common".
method of data flow control for serial communications
A number system using a decimal 16 as its base. A single
digit number in HEX ranges from 0 to 15, represented by 0
to 9 and A to F.
Human-Machine Interface (formerly MMI)
IT
Umbrella concept for ABB's vision for enterprise automation.
IT
Architecture The architecture of the Industrial
defines how the system is built, in terms of basic concepts,
underlying technologies, system topology, modularity, and
mechanisms for interaction between different parts of the
system. It also defines concepts, rules, and guidelines that
a component must comply with in order to fit in the
Industrial
IT
system. A central feature of the IIT architecture is
IT
system. The architecture