Technical information

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1SDC210033D0202
Glossary
Communication
G5.1 Communication protocol
Specification of standardized dialogue among several digital devices which exchange data.
It is an operating mode based on the structure or length of binary words that must be com-
mon to all the elements that exchange data. Communication without dialogue protocol is not
possible.
G5.2 Modbus RS485
This is a basic communication protocol, one of the most widespread standards in industrial
automation and power distribution spheres.
G5.3 Network
A network generically consists of nodes interconnected with communication lines:
Q
the node (an “intelligent” device able to dialogue with other devices) is the data transmis-
sion and/or reception point;
Q
the communication line is the element that connects two nodes and represents the direct
path the information takes in order to be transferred between two nodes. In practice, it
is the physical means (coaxial cable, twisted telephone cable, optic fibre, infrared rays)
along which the information and data travel.
G5.4 Bus network
The bus network structure is based on a common transmitting means (usually a twisted
cable or coaxial cable) for all the nodes connected, therefore in parallel.
Consult QT9: “Communication with ABB circuit-breakers via Bus” for further details.