Serial interface
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isoLR275_D00127_00_M_XXEN/07.2018
6.2
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.
6.2.1
Correct arrangement
Three examples for correct arrangement:
6.2.2
Wrong arrangement
Three examples for wrong arrangement:
6.2.3
Wiring
The suitable type of wiring for the RS-485 network is:
shielded cable, core diameter ³ 0.6 mm
(e.g. J-Y(St)Y 2x0.6), shield connected to earth (PE) on one end.
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 a DI1 repeater.
