Adamczewski GmbH
Manual AD-MM 500 FE
RS-485
The figure 9.2 shows the configuration of the RS-485 interface with several participants in a
Modbus segment according to the specification ’Modbus over serial line’.
Figure 9.2:
RS-485 with several bus participants
ITr
Twisted, shielded cable must be used as a bus cable
IDv
Passive stub lines must be as short as possible
Mass
The earth connection of all bus participants must be connected to one another
LT
The bus line must be terminated at both ends with terminating resistors of 120 Ohm between
lines A and B.
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1.0 2021-05-19