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62 COM2 RI#
64 GND
Table 1.4.1-1 Signal Description for COM
1.4.2 Schematic Guidelines
As for general ESD protection, the transmitters/receivers of RS-232/422/485 in CPU
board can meet the requirement, and users don't implement extra ESD components.
Considering EMI, the bead and capacitors are the recommendatory solution. For
placement concern, EMI solution should be close to connector.
CPU Board
Figure 1.4.2-1 EMI demonstration for RS-232 Application
GND
CN
I/O Board
EMI Solution
DCD#
B22
DSR#
B23
RXD
B24
RTS#
B25
TXD
B26
CTS#
B27
DTR#
B28
RI#
B29
14
GND
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
600_100MHz 0.3A
0402
RI#
GND
CN11
10
1
6
2
7
3
8
4
9
5
11
DSUB_9(M)H
GND_Chasis
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