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30
D+
D-
1
7
2
8
3
9
4
10
5
11
6
12
D+
D-
1
7
2
8
3
9
4
10
5
11
6
12
D+
D-
1
7
2
8
3
9
4
10
5
11
6
12
D+
Rt
MASTER
SLAVE-1
SLAVE-2
SLAVE-N
Rt
D-
PC(Personal Computer)
RS-232
RS-485
Convertor
Þ
RS-232
Connection
Cable
32 terminal can be connected in RS-
485 line
Rt resistor = 120
For communication connection
Twisted Pair cable must be used
Cable lenght can be maximum 1000
meters in 9600 baud rate.
When baud rate increases, cable
lenght must decrease.
W
6.2 Connection for RS-485 Serial Communication