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8.4.3
Suggested Wiring for RS-485
300R
&
74H C 132
2
300R
680R
H C PL0601
EN
M
300R
M
300R
R T S
C T S
Figure 8-3
Circuit Diagram
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
1
2P5
100
EN 1 G N D
75A LS176D
U +
1K
68n
2P5
2P5
2M
680R
680R
U -
EN
O U T
H C PL7101
U +
U +
IN
68n
P5
T XD
2
3
4
5
6
7
8
B - Ltg.
R T S2M 2P5
A - Ltg.
1
1
2
D river selection
D iff. voltage > 2V
EN 2
680R
C aution: P otential isolation to
2M
2M
2P5
1K
68n
68n
IN
U -
U +
U +
U +
U -
EN
U -
M
68n
20K
M
P5
R XD
Asynchronous Interface
9
2M
100
Shield
bus P 5 and 2 P5
Layout :Keep lines as
short as possible
H C PL7101
O U T
680R
113
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