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Network structure
Fig. 8-5 shows an example for the setup of
an automation system with data exchange
using Modbus protocol. A maximum of 246
devices can be addressed.
Î Connect a converter to the computer to
convert the RS-232 signal issued by the
computer into a RS-485 signal.
Î A repeater must be used if the line ex-
ceeds a length of 1200 m or if more than
32 participants are connected to the bus.
1
Converter
2
Repeater
3
Modbus device, e.g. TROVIS 6495-2
3
max.
30
3
Fig. 8-5: Network structure with converters and repeaters
EB 6495-2 EN
1
RS-485
RS-485
3
max.
30
3
2
RS-485
RS-485
We recommend not to connect more than
three repeaters in series. As a result,
lines of 4800 m can be achieved. Ten of
such lines can be connected in parallel
on setting up the network.
Î Bus terminators must be fitted at the be-
ginning and end of every section, e.g.
between the converter and repeater.
RS-232
RS-232
2
RS-485
RS-485
3
max.
30
3
Operation
3
max.
31
3
2
RS-485
RS-485
8-25
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