The Start signal reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Start signal

In telecommunication, the term start signal has the following meanings:

1. A signal that prepares a device to receive data or to perform a function. Contrast with A-condition. 2. In start-stop transmission, a signal at the beginning of a character that prepares the receiving device for the reception of the code elements.

Note: A start signal is limited to one signal element usually having the duration of a unit interval.

Source: from Federal Standard 1037C and from MIL-STD-188

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