INVT GD300-037G-4 User Manual

Goodrive300 Series VFD Communication protocol
209
Computer
Earth
Earth
Twisted pairs with shield screen
RS485 route
Convert from
RS232 to RS485
VFD
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 120Ω which is shown as figure 2. Figure 3 is the simply
connection figure and figure 4 is the real application figure.
1# 2# 3# 4# 32#
120Ω
120Ω
Figure 10-2 Chrysanthemum connection
1# 2# 3# 31#Master
A+
B-
A+ B-
Figure 10-3 Chrysanthemum connection
INVT VFD
Address 1
INVT VFD INVT VFD
Earth
485+
485-
Earth
485+
485-
Earth
485+
485-
120Ω
Terminal resistor
Computer
Converter
GND
RS232–485
Max. length of RS:
15m
Shielded twist pairs
Address 2
Address N
Figure 10-4 Chrysanthemum connection applications

INVT GD300-037G-4 Specifications

General

Brand	INVT
Model	GD300-037G-4
Category	DC Drives
Language	English