Cable AR - Modem

 The Serial Port cable (Async Cable EIA-232) is for systems that have a nine
 pin serial port connector

                                         _________________________________
                   5       1            |                                 |
        System    _|_______|_           | System End          Device End  |
         End     | o o o o o |          | 9-pin               25-pin      |
                  \ o o o o /           |                                 |
        Female     / _____ \            |____________Signal_______________|
         DB-9     9         6           |                                 |
                                        | Shell  Shield Ground   l, Shell |
                                        | 1      CD              8        |
                                        | 2      RxD             3        |
         1      Device End      13      | 3      TxD             2        |
        _|_______________________|_     | 4      DTR            20        |
       | . . . . . . . . . . . . . |    | 5      Signal Ground   7        |
        \ . . . . . . . . . . . . /     | 6      DSR             6        |
          |_____________________|       | 7      RTS             4        |
         14     DB-25 Male     25       | 8      CTS             5        |
                                        | 9      RI             22        |
                                        |_________________________________|