Goodrive300-LIFT series inverter
Communication protocol
-115-
PC
Inverter
Earth
A
B
B
A
Earth 485+ 485-
RS485 line
RS232-RS485
converter
Shielded twisted pair
Figure 10-1 RS485 physical connection in single application
10.3.1.2
Multi-application
In the real multi-application, the chrysanthemum connection and star connection are commonly used.
Chrysanthemum chain connection is required in the RS485 industrial fieldbus standards. The two
ends are connected to terminal resistors of 120
Ω
which is shown as Figure 10-2. Figure 10-3 is the
simply connection figure and Figure 10-4 is the real application figure.
1#
2#
3#
4#
32#
120
Ω
120
Ω
Figure 10-2 Chrysanthemum connection
Figure 10-3 Simplified chrysanthemum connection
INVT
inverter
INVT
inverter
Address 1
INVT
inverter
Address n
Earth 485 +
485-
Ea
485 -
Earth 485 +
485-
PC
GND
RS232-485
converter Max. length of
RS232 cable:
15 m
Shielded twisted pair
120
Ω
terminal
resistor
Address 2
Figure 10-4 Chrysanthemum connection applications