Frequency Inverter ST600 Series High-Performance Multifunction VFD Communication protocol
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9.3.1.2 Application to multiple VFDs
In practical application to multiple VFDs, chrysanthemum connection and star connection are
commonly used.
According to the requirements of the RS485 industrial bus standards, all the devices need to be
connected in chrysanthemum mode with one 120 Ω terminal resistor on each end, as shown in Figure
9-3. Figure 9-4 is the simplified wiring diagram, and Figure 9-5 is the practical application diagram.
Figure 9-3 On-site chrysanthemum connection diagram
Figure 9-5 Practical application diagram of chrysanthemum connection
Figure 9-6 shows the start connection diagram. When this connection mode is adopted, the two
devices that are farthest away from each other on the line must be connected with a terminal resistor
(in Figure 9-6, the two devices are devices 1# and 15#).
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