2. <communications> A communications system in which data transmission may start at any time and is indicated by a start bit, e.g. EIA-232. A data byte (or other element defined by the protocol) ends with a stop bit. A continuous marking condition (identical to stop bits but not quantized in time), is then maintained until data resumes.
Nearby terms: asymmetrical modulation « Asymmetric Digital Subscriber Line « Asymmetric Digital Subscriber Loop « asynchronous » Asynchronous Balanced Mode » Asynchronous Communications Interface Adapter » asynchronous logic