User`s guide

135
Connection from
Switch’s Serial
Port to 25-Pin
DCE Port
Connection from
Switch’s Serial
Port to 25-Pin
DTE Port on PC
Switch’s 9-Pin Serial
Port
CCITT Signal
Modem’s 25-pin
DCE Port
1 DCD 8
2 RXD 3
3 TXD 2
4DTR20
5 SGND 7
6 DSR 6
7 RTS 4
8 CTS 5
9RI22
Switch’s 9-Pin Serial
Port
Null Modem PC’s 25-Pin DTE Port
1 DCD 8 DCD
2 RXD 3 TXD
3 TXD 2 RXD
4 DTR 20 DTR
5 SGND 7 SGND
6 DSR 6 DSR
7 RTS 4 RTS
8 CTS 5 CTS
9 RI 22 RI
1
2
3
4
5
6
7
8
9
1
3
2
20
7
4
5
20
6