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6ft AT Modem DB9F/DB25M Molded Cable
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:
|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.
PROS: It's cheap, the build quality is good, and the pin-out is dead on.