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Glossary
10BASE-T
10 Mbit/s twisted pair Ethernet standard.
Standardized in IEEE 802.3i
APIPA
Automatic Private IP Addressing
Class A
Class A equipment is that used in commercial or
light industrial environments.
DCE
Data communications equipment. DTE and
DCE devices have different pinouts for RS-232
connectors. A Modem for example is a DCE.
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-232
Standard for serial transmission of data between
two devices, also known as RS-232 and V.24.
EIA-422
ANSI/TIA/EIA-422
transmission of data between two devices, also
known as RS-422 and V.11.
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
ESD
Electrostatic
discharge.
electronic equipment.
UMSLMODGW-1006
standard
for
serial
standard
for
serial
ESD
can
damage
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 upper-level protocols, including
TCP/IP.
Gateway
A network device that passes data between
different networks or fieldbusses.
Gateway address
The IP address of the gateway or router used to
access the Internet from the local are network.
IEEE
Institute of Electrical and Electronics Engineers
IP
Ingress Protection Rating standardized in IEC
60529. Standard for various grades of electrical
enclosures.
IP address
A numeric address used by computer hosts to
transmit and receive information over the Internet.
ISO
International Standards Organisation
MAC address
Every piece of Ethernet hardware has a unique
number assigned to it called it's MAC address.
MAC addresses are administered and assigned
by the IEEE organization.
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.
NEMA
National Electrical Manufacturers Association.
NEMA defines standards for various grades of
electrical enclosures.
Node
A communications device on the network.
PC/ABS
Polycarbonate-ABS. Widely used thermoplastic
material.
PLC
Programmable Logic Controller
RS-232
See EIA-232.
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