xiv 1.5 Open Network Glossary
Introduction
Term Explanation
NI The acronym for N
etwork Integrator.
In the narrow sense, NI is the term used to refer to companies that have signed an NI contract with
ECHELON. In the broad sense, NI is the generic term used to refer to companies and engineers that
configure LONWORKS system networks proposed by ECHELON. The work of an NI is included in that of an
SI (system integrator) or SE (system engineer) in the case of computer systems. In LONWORKS systems,
the work of an NI involves network topology and network.
NI companies in Japan Obayashi Corporation
Takasago Thermal Engineering Co., Ltd.
DAI-DAN Co., Ltd.
NTT DATA Corporation
Hitachi Plant Engineering & Construction Co., Ltd.
Shimizu Corporation
Yukoukeisou Co., Ltd.
Chiyoda Keiso Co., Ltd.
System instrumentation Co., Ltd.
Hibiya Engineering, Ltd.
Shinryo Corporation
Mita Engineering Co., Ltd.
Taikisha Ltd.
Creight Co., Ltd.
Kyowa Exeo Corporation
As of August 2001
Node Refers to the devices connected by cable to the LON.
In other words, it refers to the devices to be controlled by the LON or BACnet.
VRV, valves and sensors are some examples.
nvi N
etwork Variable Input
nvo N
etwork Variable Output
Object Monitoring items and data.
Refers to something that regulates the operation of the object to be controlled.
The equivalent of a LON's SNVT or BACnet's object.
Open Network Refers to a network in which machines with different specifications are able to communicate with each other.
Profile In terms of a LON, the following are examples of items that are determined for each function of the respective
nodes in the LON:
- Network variable type
- Meaning of the network variable (function)
- Range and meaning of the network variable value (function).
Standardizing these ensures interconnectivity.
However, a LON is not configured for VRVs or PAs, so profiles for such A/C systems must be created by
each manufacturer in accordance with the respective network variable regulations. (Due to the fact that the
profiles differ with respect to the manufacturer, profiles such as those for VRVs and PAs are not certified by
LONMARK. However, because they conform with regulations, they can be treated as open networks by
disclosing the network variables.
Polling When the control station does not have the necessary data (the central monitoring panel does not have any
commands), it sends requests at regular intervals to each tributary station asking whether it has any data
transmission requests (data that the tributary station would like to communicate to the control station). The
control station sequentially gives each of the tributary stations request transmission rights, allowing them to
send the respective data.
Property Refers to each of the elements comprising an object.
Protocol The agreed rules and regulations used in communication between different computer programs.
When the protocol differs, two computer programs are unable to comprehend each other (communicate).
P.P.D It stands for P
ower Proportional Distribution
Proportional calculation of electric comsumption of VRV indoor unit
Router Refers to a device used for connections between different networks.
A router forwards data packets between networks. In an internal (in-company) LAN, it is used to connect the
LANs installed on a per floor basis. Meanwhile, a dial-up router is used to connect the Internet with a LAN.
Routers are also used for connections between an Ethernet and LON, for example, in the field of open
protocols used for building control.
R/C R
emote Controller
A Controller that let you individually control the operation of indoor unit for Air-conditioners
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