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## 11. Cables, extensions and adaptors

The only wires needed in a mouse cable are as follows: TxD and RxD for data transfer, RTS and/or DTR for power sources, and ground. Translated into pin numbers, they are:

> `

>                 9-pin port     25-pin port
>             TxD     3                2
>             RxD     2                3
>             RTS     7                4
>             DTR     4               20
>             Gnd     5                7

> `

The above table may be of use if you wish to make adaptors between 9- and 25-pin plugs, or extension cables.

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