Flachmann und Heggelbacher Docklight V2.2, User Manual

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Docklight V2.2 User Manual 07/2016 Copyright 2016 Flachmann und Heggelbacher GbR
Glossary / Terms Used
Last not least, if you are truly fascinated by CRC alchemy, you will, sooner or later, run
into the following article:
"A Painless Guide to CRC Error Detection Algorithms" by Ross N. Williams
http://www.ross.net/crc/
11.5 DCE
Data Communications Equipment. The terms DCE and DTE refer to the serial devices on
each side of an RS232 link. A modem is a typical example of a DCE device. DCE are
normally equipped with a
female SUB D9 or SUB D25 connector. See also DTE .
11.6 DTE
Data Terminal Equipment. The terms DCE and DTE refer to the serial devices on each
side of an RS232 link. A PC or a terminal are examples of a typical DTE device. DTE are
commonly equipped with a
male SUB D9 or SUB D25 connector. All pinout
specifications are written from a DTE perspective. See also DCE .
11.7 Flow Control
Flow control provides a mechanism for suspending transmission while one device is
busy or for some reason cannot further communicate. The
DTE and DCE must agree on
the flow control mechanism used for a communication session. There are two types of
flow control: hardware and software.
Hardware Flow Control
Uses voltage signals on the RS232 status lines RTS / DTR (set by DTE ) and CTS / DSR
(set by DCE ) to control the transmission and reception of data. See also RS232 pinout .
Software Flow Control
Uses dedicated ASCII control characters (XON / XOFF) to control data transmission.
Software flow control requires text-based communication data or other data that does
not contain any XON or XOFF characters.
11.8 LIN
Local Interconnect Network. A low cost serial communication bus targeted at distributed
electronic systems in vehicles, especially simple components like door motors, steering
wheel controls, climate sensors, etc. See also
http://www.lin-subbus.org
11.9 MODBUS
MODBUS is an application layer messaging protocol that provides client/server
communications between devices connected on different types of buses or networks. It
is commonly used as "MODBUS over Serial Line" in RS422/485 networks, but can be
implemented using TCP over Ethernet as well ("MODBUS TCP").