10 – RS485 Modbus adapter
RS485
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.
Advantage: no ground loop.
The adapter has an integrated terminator resistance which may be connected with a
switch.
Advantage: no external device to be added.
The adapter contains transient voltage suppressors.
Advantage: the device and the network are protected against voltage surges.
The adapter is fitted with transmission and reception indication LED’s.
Advantage: it allows visualizing Modbus queries and Modbus answers.
The controller allows a software adjustment of communication parameters.
Advantage: no multiple hardware dipswitches to handle.
Advantage: permits self-tuning of communication parameters with a higher level
software application.
4.2 Physical dimensions
The Modbus adapter is especially suitable for application where space requirements are
important.
