Two Bus Segments Connected To The Rs 485 Repeater - Siemens SIMATIC S5 Manual
Distributed i/o system
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Segment 1
In Fig. 6-4, one of the two segments connected to the RS 485 repeater is
terminated,
looped through and one is terminated:
segment 2 looped
through
Segment 1
Segment 2
Figure 6-4
Two bus segments connected to the RS 485 repeater (2)
Segments 1 and 2
In Fig. 6-5, both segments connected to the RS 485 repeater are looped
looped through
through:
Segment 1
Segment 2
Figure 6-5
Two bus segments connected to the RS 485 repeater (3)
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
RS 485 repeaters: installing, connecting and operating
Segment 1
Terminating resistor
R
Segment 2
Terminating resistor
bus segment 2
bus segment 2
off
off
Segment 1
R
Segment 2
bus segment
bus segment
bus segment 1
bus segment
bus segment 1
bus segment 1
on
on
on
Terminating resistor
bus segment 1
off
off
Terminating resistor
bus segment 2
bus segment 2
off
off
6-7
6
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