Technical data

Chapter 2 – Installation
RS485 and RS232 Adapter Installation and Start-up Guide 2-11
Earthing and Termination
RS485 Bus
The RS485 network should not be directly earthed at any point. All the devices
on the network should be well earthed using their corresponding earthing
terminals.
As always, the earthing wires should not form any closed loops, and all the
devices should be earthed to a common earth.
The RS485 network must be terminated using 120
9 resistors at both ends of
the network as shown in Figure 2-10. These resistors are already resident on
the adapter. Use switch S1 to connect the termination resistors.
Figure 2-10 Termination for the RS485 link.
The connections may only be made with the drive disconnected from the
power source.
Terminated Terminated