While legacy PCs (post IBM PC/AT) typically use 9-pin RS-232 plugs, external modems are usually equipped with 25-pin RS-232 sockets. You can depend on Monoprice to have the cables you will need for this type of connection!
This cable features a female DE-9 (DB-9) socket on one end and a male DB-25 plug on the other. The 9 pins of the DE-9 connector are wired to 9 of the pins on the DB-25 connector as shown in the following table:
|
DE-9 (DB-9) |
DB-25 |
Function |
|
1 |
8 |
Data Carrier Detect (DCD) |
|
2 |
3 |
Receive Data (RD or Rx) |
|
3 |
2 |
Transmit Data (TD or Tx) |
|
4 |
20 |
Data Terminal Ready (DTR) |
|
5 |
7 |
Signal Ground (SGND or Gnd) |
|
6 |
6 |
Data Set Read (DSR) |
|
7 |
4 |
Request To Send (RTS) |
|
8 |
5 |
Clear To Send (CTS) |
|
9 |
22 |
Ring Indicator (RI) |
The connector heads are molded onto the cable and each includes a pair of thumbscrews to secure the connector to the PC or modem.
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