| 摘要 |
A communication system includes a primary unit transmitting a first signal at a first instance, receiving a second signal at a second instance and energized by a power source having a voltage level, a secondary unit transmitting a third signal at a first instance, receiving a fourth signal at a second instance, and having a first communication mode and a second communication-shut mode, and a mode-changing device enabling the primary unit to generate a mode-changing signal to be received by the secondary unit for changing the secondary unit from the first communication mode into the second communication-shut mode when the voltage level falls below a specific value. A mode-changing method for such communication system is also provided.
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