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B-5
Serial Port to 9-Pin COM Port on PC
Serial Port to 25-Pin DCE Port on Modem
Serial Port to 25-Pin DTE Port on PC
Barricade’s 9-Pin
Serial Port
CCITT Signal PC’s 9-Pin COM
Port
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
Barricade’s 9-Pin
Serial Port
CCITT Signal Modem’s 25-Pin
DCE Port
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
Barricade’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
11
23
32
48
520
67
74
95
20 6