Monoprice 25ft AT Modem DB-9F/DB-25M Molded Cable
Description
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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