A "NULL Modem" adaptor can easily be made using the connection information below. Under most circumstances, a 9 Pin Male connector will be required on each end.
|
Signal Name |
DB 25 Pin |
DB 9 Pin |
DB 9 Pin |
DB 25 Pin |
|
|
TD (Transmit Data) |
2 |
3 |
2 |
3 |
RD |
|
RD (Receive Data) |
3 |
2 |
3 |
2 |
TD |
|
RTS (Request To Send) |
4 |
7 |
8 |
5 |
CTS |
|
CTS (Clear To Send) |
5 |
8 |
7 |
4 |
RTS |
|
SG (Signal Ground) |
7 |
5 |
5 |
7 |
SG |
|
DSR (Data Set Ready) |
6 |
6 |
4 |
20 |
DTR |
|
CD (Carrier Detect) |
8 |
1 |
4 |
20 |
DTR |
|
DTR (Data Terminal Ready) |
20 |
4 |
1 |
8 |
CD |
|
DTR (Data Terminal Ready) |
20 |
4 |
6 |
6 |
DSR |