3Com 3C16630A User Manual page 84

A-4 A A: T
PPENDIX
PC-AT Serial Cable
9 pin to RS-232C 25 pin.
RS232C Serial Port
25 pin male
TxD
RxD
Ground
RTS
CTS
DSR
DCD
DTR
RI
Modem Cable
RS-232C 25 pin to RS-232C 25 pin.
RS232C Serial Port
25 pin male
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
I
ECHNICAL NFORMATION
2
3
7
4
n/c n/c
5
6
8
20
22
n/c n/c
1
2
3
4
5
6
7
8
20
, C P -O
ABLE IN UTS AND
RxD
2
3 TxD always required
5 Ground
7 RTS
4 DTR
8 CTS
required for
handshaking
6 DSR
DCD
1
9 RI
1
Screen
2 TxD
3
RxD
4 RTS
5 CTS
6
DSR
7 Ground
8
DCD
20 DTR
P
ROTOCOLS
DUA1663-0BAA03