16 Installation instructions / ACS-2 plus
6.1.3 Potential separation and terminating resistor
Potential separation
Each RS485 line must be provided with one non-floating interface. The other interfaces must be floating. The best
position of the non-floating interface is in the middle of the RS485 line. The ACS-2 plus, fitted with the interface
which is not floating, must have a good grounding. If this is not the case, you should select another ACS-2 plus.
Here a good grounding is more important than the center of the RS485 line.
Terminating resistors
The terminating resistors must be placed at the first and the last device of a line. Here it depends on the type
of wiring.
Caution! Malfunction possible!
Star-shaped cabling of the devices is not allowed.
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