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5.5.2.2 RS-485 topology
5.5 Serial interfaces for communication with PLCs or devices
A bus segment can interconnect up to 32 slaves.
l
Several bus segments can be connected using repeaters (bi-directional amplifiers).
l
The use of repeaters enables the maximum cable length to be
increased.
For more details, please consult the documentation provided by man-
ufacturer.
A bus segment must be provided with cable termination (120 Ohm) at both ends.
These terminals must be connected in the plug directly between pin 3 and 7.
The bus segment must be terminated at both ends.
No more than two terminations must be provided for each bus seg-
ment.
Operation without correct cable termination can cause transfer
errors.
1
6
2
7
A
120
3
B
8
4
9
5
GND
Figure 33: Bus segment with four nodes
XV300 04/19 MN048017EN www.eaton.eu
1
6
2
7
A
A
A
3
B
B
B
8
4
9
5
GND
GND
GND
5. External connections
1
1
6
2
2
7
A
A
3
3
B
B
8
4
4
9
5
5
GND
GND
6
7
120
8
9
63
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