INVT Goodrive350-19 Series Operation Manual page 394

Goodrive350-19 Series VFD for Crane
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 at the first and last ends, as
shown in Figure 10-2. Figure 10-3 shows the simplified wiring diagram. Figure 10-4 shows the actual
application.
120Ω
1 #
A+
B-
主机
Shielded twisted pair
RS232- 485
Converter
RS cable max.
GND
length
PC
Figure 10-5 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
(the two devices are devices #1 and #15).
2 #
Figure 10-2 Onsite chrysanthemum connection
A+ B-
1#
Figure 10-3 Simplified chrysanthemum connection
485 +
Ground
INVT
VFD
15m
:
Address 1
Figure 10-4 Practical chrysanthemum connection application
3 #
2#
485+
485-
Ground
INVT
VFD
Address 2
-382-
Communication protocol
4 #
3#
485 +
485 -
Ground
INVT
VFD
Address n
120Ω
32 #
31#
120Ω
Terminal
resistor
485-