6
SP338/SP339/XR34350 EVALUATION BOARD USER’S MANUAL
REV. 2.0.1
2.1.4
Full-Duplex RS-485/422 Mode #1
Figure 5
below shows the SP338/339/XR34350 configured in the full-duplex RS-485/422 mode #1.
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J23 Pins 7 & 8 (MODE0) - ’1’ (jumper installed between these pins)
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J23 Pins 9 & 10 (MODE1) - ’1’ (jumper installed between these pins)
?
J23 Pins 11 & 12 (MODE2) - ’0’
The RS-485 signals are also accessible at J16.
F
IGURE
5. F
ULL
-D
UPLEX
RS-485 M
ODE
#1
Sl
ew
Di
r1
Mode
0 = 1
Mode
1 = 1
Mode
2 = 0
Te
rm
InvDi
r
En
ab
le
=
1
Vcc
T1
R1
R2
R3
R4
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
30
29
28
27
26
25
24
23
22
21
120O
All pull-downs 330kO
R1
V+
C2+
Vcc
C1+
C1-
C2-
V-
Vcc
C3
0.1
µF
C2
0.1
µF
C1
0.1
µF
C4
0.1
µF
Cc
1.0
µF
L1 = 1
L2
L3
L6 = 1
L8 = 1
L9 = 1
Vcc
TP6
TP8
TP26, TP51
TP24, TP43
TP22, TP42
TP20, TP41
