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CHAPTER 3: Installation
Figure 8. Multipoint, 2-Wire (Half-Duplex).
Sample 4-Wire Multipoint Configuration
In the following application, an industrial controller is used to gather information
from several remote programmable logic controller (PLC) stations (see Figure 9).
A system protocol has been defined such that all the programmable logic
controllers receive the information sent by the industrial controller, but only the
remote station specifically addressed will respond. In this system, the industrial
controller and all the remote stations are DTE devices. The step-by-step installation
procedure follows Figure 9.