Viper SC+™ IP Router for Licensed Spectrum PN 001-5008-000 Rev. C
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2.1.1.
POINT-TO-POINT NETWORK
A point-to-point network is the simplest type of network, and may be used for connecting a pair of PCs, a host
computer and a terminal, a SCADA polling master and one remote, or a wide variety of other networking applications.
Figure 4 – Point-to-Point Network
2.1.2.
POINT-TO-MULTIPOINT NETWORK
A Point-to-Multipoint network is a common network type used in SCADA and other polling systems. The Master Polling
station communicates with any number of remotes and controls the network by issuing polls and waiting for remote
responses. Individual PLC/RTU remotes manage addressing and respond when their individual addresses are queried.
PLC/RTU unit addresses are maintained in a scanning list stored in the host program or master terminal device at the
SCADA host site. Communications equipment is transparent and does not interact with specific remotes; all data is
coupled to the host on a single data line (such a network is commonly used with synchronous radio modems and
asynchronous radio modems).
Figure 5 – Point-to-Multipoint Network