Serial interfaces
81
IRDH575_D00089_05_M_XXEN/01.2020
7.2 Topology RS-485 network
The optimum topology for the RS-485 network is a daisy-chain connection. In
this connection, device 1 is connected to device 2, device 2 to device 3, device
3 to device n etc. The RS-485 network represents a continuous path without
branches.
7.2.1 Correct arrangement
Three examples for correct arrangement:
7.2.2 Wrong arrangement
Three examples for wrong arrangement:
7.2.3 Wiring
A suitable type of cable for the wiring of the RS-485 network is:
screened cable, core diameter ≥ 0.6 mm
(e.g. J-Y(St)Y 2x0.6), screen on one side connected to earth (PE).
Connection to the terminals A and B.
The number of bus nodes is restricted to 32 devices. When more devices are
to be connected, Bender recommends to use an RS-485 repeater DI1.
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