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7 Appendices
A1 List of abbreviations
ASCII
Baud rate
Bit
Bus
Byte
Chassis or Chassis Ground
Coil
Common
CRC
CTS
DHCP
DLL
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.
is an autoconfiguration protocol used on IP networks. Computers
that are connected to IP networks must be configured before they
can communicate with other computers on the network. DHCP
allows a computer to be configured automatically, eliminating the
need for intervention by a network administrator
Dynamic-link library is Microsoft's implementation of the shared
library concept in the Microsoft Windows and OS/2 operating
systems. These libraries usually have the file extension DLL, OCX
(for libraries containing ActiveX controls), or DRV (for legacy
system drivers). The file formats for DLLs are the same as for
Windows EXE files — that is, Portable Executable (PE) for 32-bit
and 64-bit Windows. As with EXEs, DLLs can contain code, data,
and resources, in any combination.
handshaking
signal.
RVT communication ç Appendices - 77
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