Serial Data Communication Start Bit Detection Reliability
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Solution Overview
Problem
In serial data communication, devices without a built-in fail-safe circuit may fail to detect the start bit when its preceding signal potential is below a certain level, preventing the initiation of communication.
Innovation Solution
A serial data communication device and method that transmit a high level signal for a prescribed duration immediately before the start bit, ensuring detection by the receiving device, with a duration setting mechanism to adjust this period as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no high level signal is transmitted before the start bit, then the signal transmission is simpler and faster, but the reception side cannot detect the start bit when the preceding signal potential is below a predetermined level
Solution Approach 1:
The invention applies preliminary action by transmitting a high level signal (preset period signal) before the start bit is sent. This preliminary signal ensures that the reception side's signal level is properly initialized, enabling reliable detection of the subsequent start bit. The duration of this preliminary signal is set to be at least the fall detection period of the reception side, ensuring proper detection conditions are met before actual data transmission begins.
2Reliability
If a high level signal is transmitted before the start bit, then the start bit detection reliability is improved, but the signal transmission time increases
Solution Approach 1:
The invention applies parameter changes by carefully controlling the duration of the high level signal (preset period signal) transmitted before the start bit. The duration is specifically set to be at least the fall detection period of the reception side, which is the minimum necessary time to ensure reliable detection. This optimized parameter setting ensures that the preliminary signal is long enough to guarantee detection reliability while being as short as possible to minimize time loss.
Data Source
AI summary
The purpose of the present invention is to cause a reception side communication device to appropriately detect a start bit. A serial communication unit (100), which transmits serial data by a combination of a high level signal and a low level signal, is provided with: a serial communication part (111) that provides the start bit on the head of the serial data, and transmits the high level signal in a prescribed duration just before the start bit; and a duration setting part (113) that sets the duration.