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8 Appendices
A1 List of abbreviations
ASCII
Baud rate
Bit
Bus
Byte
Chassis or Chassis Ground
Coil
Common
CRC
CTS
Earth or Earth Ground
Ground Voltage reference point of a circuit.
Handshaking
Hexadecimal or HEX A number system using a decimal 16 as its base. A single digit
HMI
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)
A connection to an electrically conductive housing or frame 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 (BOOL). 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
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
number in HEX ranges from 0 to 15, represented by 0 to 9 and A to
F.
Human-Machine Interface (formerly MMI)
handshaking
signal.
RS485 ç Appendices - 19
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