start-stop system
Technical computing term for asynchronous serial communication where each character is framed by start and stop bits.
The start-stop system is one of the basic methods of serial communication.
同期式 (synchronous system) transmits data continuously with a shared clock signal, while 調歩同期式 uses start/stop bits for each character without a separate clock line.
Compound of 調歩 (start-stop, from 調 'adjust' and 歩 'step') + 同期式 (synchronous system). The exact derivation is uncertain; the term is a technical coinage for asynchronous serial communication.