Null modem cable

Below cable usually used for terminal and printers being connected to serial ports.

     DCE to DCE
             DCE                                       Terminal/Printer/Modem
          .-------.                                  .-------.
     	  |   1   |--------Protective Ground---------|   1   |
          |       |                                  |       |
          |   2   |<<<-TD----------------------RD----|   3   |
          |       |    (Pins 2 and 3 are crossed)    |       |
          |   3   |----RD----------------------TD->>>|   2   |
          |       |                                  |       |
          |   4   |<<<-RTS--------------------CTS----|   5   |
          |       |    (Pins 4 and 5 are crossed)    |       |
          |   5   |----CTS--------------------RTS->>>|   4   |
          |       |                                  |       |
          |   6   |----DSR--------------------DTR->>>|   20  |
          |       |    (Pins 6 and 20 are crossed)   |       |
          |   20  |<<<-DTR--------------------DSR----|   6   |
          |       |                                  |       |
          |   7   |---------Signal Ground------------|   7   |
          |       |                                  |       |
          .-------.    	                             .-------.

            DB-25                                      DB-25

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