A transmission control character used as the first character of a message heading.

A transmission control character that precedes a text and may be used to terminate the message heading.

In facsimile systems, a signal used for starting the process of converting the electrical signal to an image on the record medium.

A character that includes one start signal at the beginning and one or two stop signals at the end.

In start-stop modulation, the ratio of (a) the maximum absolute difference between the actual and the theoretical intervals that separate any significant instant of modulation or demodulation from the significant instant of the start signal element immediately preceding it to (b) the unit interval.

In start-stop modulation, the maximum amount of overall start-stop distortion that is compatible with correct translation by the start-stop equipment of all the character signals that appear singly, that appear at the maximum allowable speed, or that appear at the standard modulation rate.

A method of modulation in which the time of occurrence of the bits within each character, or block of characters, relates to a fixed time frame, but the start of each character, or block of characters, is not related to this fixed time frame.

Synonym asynchronous communications system.

1. Asynchronous transmission in which a start pulse and a stop pulse are used for each symbol.
2. Signaling in which each group of code elements corresponding to an alphanumeric character is (a) preceded by a start signal that serves to prepare the receiving mechanism for the reception and registration of a character and (b) followed by a stop signal… (Read More →)

Synonym teletypewriter signal distortion.