INVT Goodrive 310-UL Series Operation Manual page 199

GD310-UL series VFD
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 120Ω which is shown as Figure 10-2. Figure 10-3 is the
simply connection figure and Figure 10-4 is the real application figure.
GND
Computer
Computer
Figure 10-1 RS485 physical connection in single application
120 Ohm
1 # 2 #
Figure 10-2 Chrysanthemum connection
A +
B -
A + B -
1 #
Master
Figure 10-3 Chrysanthemum connection
Shielded twist pairs
485 +
Earth
-
RS232485
Conv
VFD
ertor
.
Max length of
RS: 15m
Address 1
Figure 10-4 Chrysanthemum connection applications
Twisted pairs with shield screen
RS485 route
Earth
Earth
Convert from
RS232 to RS485
3 # 4 #
2 # 3 #
485 +
485 - 485 -
Earth
VFD
Address 2
-191-
Communication protocol
VFD
120 Ohm
32 #
31 #
120 ohm
485 +
terminal resistor
485 -
Earth
VFD
Address n