User manual

Digital Monitor AMC-1DBx Series User Manual
3
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2.5 GLOSSARY
Term Description
BACnet Building Automation and Control networks. BACnet is a communications protocol for
building automation and control networks. It is an ASHRAE, ANSI, and ISO standard
protocol.
BACnet allows communication of building automation and control systems for
applications such as heating, ventilating, and air-conditioning control, lighting control,
access control, and fire detection systems and their associated equipment. The
BACnet protocol provides mechanisms for computerized building automation devices
to exchange information, regardless of the particular building service they perform.
BAS Building Automation System. The control system is a computerized, intelligent
network of electronic devices designed to monitor and control building mechanical
and lighting systems.
Bps Bits per Second. In telecommunications and computing, bit rate (sometimes written
bitrate, data rate or as a variable R) is the number of bits that are conveyed or
processed per unit of time.
DCS Distributed Control System. The control system is a computerized, intelligent network
of electronic devices designed to monitor and control the mechanical and lighting
systems in a building.
EMT and EMI Electrical Metal Tube conduit also adds an added degree of electrical shielding
against EMI (Electro Magnetic Interference) from devices such as RF (Radio
Frequencies) radio sources.
IP The Internet Protocol (IP) is the principal communications protocol used for relaying
datagrams (also known as network packets) across an internetwork using the
Internet Protocol Suite. Responsible for routing packets across network boundaries, it
is the primary protocol that establishes the Internet.
IP Address An IP address consists of four numbers, each of which contains one to three digits,
with a single dot (.) separating each number or set of digits. Each of the four numbers
can range from 0 to 255. An example IP address is: 78.125.0.209.
MODBUS Modbus is a serial communications protocol published by Modicon in 1979 for use
with its programmable logic controllers (PLCs). Simple and robust, it has since
become one of the de-facto standard communications protocols in the industry, and it
is now amongst the most commonly available means of connecting industrial
electronic devices.
MODBUS ASCII Modbus ASCII is used in serial communication and makes use of ASCII characters
for protocol communication. The ASCII format uses a longitudinal redundancy check
checksum. Modbus ASCII messages are framed by leading colon (‘:’) and trailing
newline (CR/LF).
MODBUS RTU Modbus RTU is used in serial communication and makes use of a compact, binary
representation of the data for protocol communication. The RTU format follows the
commands/data with a cyclic redundancy check checksum as an error check
mechanism to ensure the reliability of data. Modbus RTU is the most common
implementation available for Modbus. A Modbus RTU message must be transmitted
continuously without inter-character hesitations. Modbus messages are framed