Eaton XV-102 Operating Instructions Manual page 50

5 Installation
5.3 Interfaces
Wiring
RS485-topology
50
Screened twisted-pair cables must be used.
Cable specifications
Rated surge impedance
Permissible surge impedance
Max. cable length
Possible baud rates
Tab. 24 Cable specifications

When preparing the cables, ensure that there is a low-resistance connection between
the cable screen and the connector casing ( Chapter 5.3.2,  30).
A bus segment can interconnect up to 32 slaves.

Several bus segments can be connected using repeaters (bi-directional amplifiers). Refer to the

documentation of the repeater manufacturer for more specific details.

The use of repeaters enables the maximum cable length to be increased. Refer to the
documentation of the repeater manufacturer for more specific details.
A bus segment must be provided with cable termination (120 ) at both ends. These terminals

must be connected in the connector 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 segment.

Operation without correct cable termination can cause transfer errors.

1
6
2
7
A
120
3
B
8
4
9
5
GND
Fig.. 26 Bus segment with four nodes
HMI/PLC XV-102 08/2016 MN04802004Z-EN www.eaton.com
120 
108...132 
1200 m
9600 Bit/s
19200 Bit/s
38400 Bit/s
57600 Bit/s
115200 bit/s
1
6
2
7
A A
3
B B
8
4
9
5
GND GND GND
1 1
6
2 2
7
A A A
3 3
B B B
8
4
4
9
5 5
GND GND
6
7
120
8
9