Console Port to 9-Pin COM Port on PC
Console Port to 25-Pin DCE Port on Modem
B-5
P
IN
A
SSIGNMENTS
Switch Port
PC Port
DB-9 Pin No.
Signal
DB-9 Pin No.
1 (DCD)
DCD
1
2 (RXD)
TXD
3
3 (TXD)
RXD
2
4 (DTR)
DSR
6
5 (SGND)
SGND
5
6 (DSR)
DTR
4
7 (RTS)
CTS
8
8 (CTS)
RTS
7
9 (RI)
RI
9
Switch Port
25-Pin Modem Port
DB-9 Pin No.
Signal
DCE Pin No.
1
DCD
8
2
RXD
3
3
TXD
2
4
DTR
20
5
SGND
7
6
DSR
6
7
RTS
4
8
CTS
5
9
RI
22
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