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RS-422 and RS-485
Up to 1200m (4000ft) 24 AWG twisted pair with foil shield and drain wire on each pair (Belden 9841 for 2-wire and
9729 for 4-wire or equiv.).
3.10. Network topology
Various kinds of network topologies may be done on the basis of an RS485 Modbus network.
The Modbus network may be managed by a computer collecting data. Typically this computer runs an OPC server
connected to a plant intranet. OPC client applications may present this information to any supervision program that
will perform the Human machine interface, data logging, and data setting ...
It is also possible to manage the RS485 Modbus network through a PLC.
Various kind of RS485 to RS232 converters exists.
To bridge the Modbus network to another kind of software protocol, various kinds of protocol converters may be used.
They are often called 'protocol gateway: Modbus to Profibus, Ethernet, CAN ...
4. RS485 Modbus adapter
The RS485 Modbus adapter enables the connection of the controller to an RS485 Modbus network.
4.1. Main features
The adapter is self-powered through the power supply of the controller.
– Advantage: an external power supply is not needed.
– Advantage: low power consumption.
The adapter is fixed directly on the back side of the RVT.
– Advantage: the Modbus adapter does not need any rail DIN or such fixation methods.
The adapter is electrically isolated from the RVT power supply.
– Advantage: the RVT is protected against common mode voltage levels applied on the RS485 network.
STATUS
Approved
SECURITY LEVEL
Public
DOCUMENT ID
9AKK107045A9895
RS 48 5 A DAPTE R
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