Start signal

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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 asynchronous serial communication, a signal at the beginning of a character that prepares the receiving device for the reception of the code elements.

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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