collision risk in DNP3 over RS485

O

Thread Starter

olivier_g

In RS485, there is risk of collision in both 2-wire half-duplex and 4-wire full-duplex systems... The question is: how to avoid this collision???

In 2-wire half duplex system (point to point or multi-point config), collision may be avoided by the use of a DCD signal "provided by the physical layer".
In 4-wire full-duplex (multi-point config), the use of control circuit is recommended: HOW and Which???

Does it mean that not only 2 or 4 wires is needed to communicate but also some additional control lines???
 
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