INVT GD310-011P-4-UL, Руководство по эксплуатации

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GD310-UL series VFD Communication protocol
-191-
VFD
Computer
Earth
Earth
Twisted pairs with shield screen
RS485 route
Convert from
RS232 to RS485
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 Ohm
120 Ohm
Figure 10-2 Chrysanthemum connection
1
#
2
#
3
#
31
#
Master
A
+
B
-
A
+
B
-
Figure 10-3 Chrysanthemum connection
VFD
Address 1
VFD VFD
Address n
Earth
485
+
485
-
Earth
485
+
485
-
Earth
485
+
485
-
120 ohm
terminal resistor
Computer
Conv
ertor
GND
RS232485
-
Max length of
RS: 15m
.
Shielded twist pairs
Address 2
Figure 10-4 Chrysanthemum connection applications