Communication system, slave unit used for communication system, and communication method
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Solution Overview
Problem
In communication systems where termination resistances are set to prevent signal waveform disturbances, disabling communication between the master unit and a slave unit with a termination resistance leads to a loss of high-speed communication, especially when the power source of the slave unit is turned off, causing a disruption in communication across the system.
Innovation Solution
The system automatically switches the communication rate from high baud rate to low baud rate when communication with a slave unit with a termination resistance is disabled, allowing communication to continue, and then switches back to high baud rate once the connection is restored, ensuring continuous communication between the master unit and slave units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high baud rate communication is used to achieve efficient data transmission, then communication efficiency is improved, but communication is disrupted when a slave unit with termination resistance is disabled
Solution Approach 1:
The invention makes the communication system dynamic by automatically adjusting the baud rate based on the operational status of slave units. The master unit detects when slave units are powered off and switches from high baud rate to low baud rate communication, ensuring continuous operation. When slave units are restored, the system switches back to high baud rate for efficient communication.
2Reliability
If termination resistance is set to slave units to prevent signal waveform disturbance, then signal integrity is improved, but the system becomes sensitive to slave unit power states
Solution Approach 1:
The invention compensates for the sensitivity to slave unit power states by changing the communication parameter (baud rate). When termination resistance is unavailable due to powered-off slave units, the system switches to low baud rate communication, which is more tolerant of signal degradation, thereby maintaining robustness.
Data Source
AI summary
A communication system includes a master unit; and a plurality of slave units including a slave unit to which a termination resistance is set, the plurality of slave units connected to the master unit via a communication line. In the communication system, the master unit includes a master communication control unit that normally sets a communication rate of communication performed with the plurality of slave units to a high baud rate, switches the high baud rate to a low baud rate after detecting that communication with the slave unit to which the termination resistance is set is disabled, transmits an instruction for switching the low baud rate to the high baud rate to the plurality of slave units after detecting that the communication with the slave unit to which the termination resistance is set is restored, and switches setting of the master unit itself to the high baud rate.