Perle Systems 5500174-11 ユーザーズマニュアル

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Definitions of Signals and Direction
Page 34
DB9 back panel connectors and pinout
The following diagram shows the SPEED1 LE standard and Low Profile back panels 
respectively.
DB9M pin 
EIA-232 
1
DCD
2
RXD
3
TXD
4
DTR
5
S-GND
6
DSR
7
RTS
8
CTS
9
RI
10
C-GND