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Glossary
RTU
Remote
terminal
designate a protocol variant of Modbus.
Modbus
Fieldbus protocol used in the process
automation industry. It uses a master
and slave structure. Originally developed
by Modicon, now part of Schneider
Automation.
Master
Active communication device, controls the
bus access.
Slave , slave
Passive communication device, answers to
the master
10BASE-T
10 Mbit/s twisted pair Ethernet standard.
Standardized in IEEE 802.3i.
APIPA
Automatic Private IP Addressing
Class A
Class
A
equipment
commercial or light industrial environments.
DIN
German Institute for Standardization
DIN rail
35 mm wide mounting bracket standardized
in DIN/EN 50022.
DTE
Data terminal equipment. DTE and DCE
devices have different pinouts for RS-232
connectors. A PC for example is a DTE.
EIA
Electronic Industries Alliance. Standard
organisation for serial communication.
EIA-232
Standard for serial transmission of data
between two devices, also known as RS-232
and V.24.
UMMODG100-2201
unit.
Also
used
is
that
used
EIA-422
ANSI/TIA/EIA-422
transmission of data between two devices,
also known as RS-422 and V.11.
to
EIA-485
ANSI/TIA/EIA-485
transmission of data between multiple
devices, also known as RS-485.
EIA-574
Standard for the pinout of serial D-sub
connectors.
EMC
Electromagnetic compatibility
EMI
Electromagnetic interference
EN
European standard
ESD
Electrostatic discharge
Ethernet
The standard for local area networks
developed jointly by Digital Equipment
Corp., Xerox, and Intel. Ethernet is used as
the underlying transport vehicle by several
in
upper-level protocols, including TCP/IP.
Fieldbus
Digital communication network used to
connect
process
control systems.
Frame
A single block of data transmission from a
device.
Gateway
A network device that passes data between
different networks or fieldbusses. It is
different to a Bridge in that protocol
conversion occurs above the application
layer rather than in the datalink layer.
Gateway address
The IP address of the gateway or router used
to access the Internet from the local are
network.
Glossary
standard
for
serial
standard
for
serial
instrumentation
and
31
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