Battery-Powered Card Reader Terminal Sleep Mode Polling
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Solution Overview
Problem
Battery-driven card reader terminals face challenges in minimizing power consumption while avoiding user discomfort due to delays in response times, which can be caused by reduced power consumption.
Innovation Solution
A wireless card reader system that includes a battery-driven card reader terminal capable of switching between normal and sleep modes, with reduced polling frequency before a state change in the target device's operating state, and an interface apparatus that relays communication and stores verification results, allowing the terminal to conserve power without significantly delaying user responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the card reader terminal operates in normal mode with frequent polling to ensure quick response, then user response time is improved, but power consumption increases
Solution Approach 1:
The card reader terminal dynamically switches between normal mode and sleep mode based on operational state. In normal mode, the terminal performs frequent polling to ensure quick response to card insertion. When no card is detected or during verification processing, the terminal transitions to sleep mode with reduced polling frequency, thereby adapting the response speed to actual needs and reducing unnecessary power consumption.
Solution Approach 2:
The terminal implements periodic polling at different frequencies depending on the operational phase. During active card detection, polling occurs at a higher frequency to quickly detect card insertion. During sleep mode or verification processing, polling frequency is reduced. This periodic action with variable frequency allows the system to balance between quick response and power savings.
2Use of energy by moving object
If the card reader terminal enters sleep mode to reduce power consumption, then power consumption is reduced, but response delay increases causing user discomfort
Solution Approach 1:
The terminal uses feedback from card detection to determine when to wake from sleep mode. When a card is detected during sleep mode, the terminal immediately wakes up and transitions to normal mode to process the card. This feedback mechanism ensures that the terminal responds promptly to user actions while spending most time in low-power state, thus maintaining good user experience while reducing power consumption.
Solution Approach 2:
The terminal performs preliminary card detection even in sleep mode at a reduced frequency. This allows the system to detect card insertion events and wake up in advance, preventing noticeable delays. The preliminary action in sleep mode ensures that the terminal is ready to respond quickly when a card is actually inserted, maintaining user experience while conserving power.
3Productivity
If the terminal polls frequently to check for verification results, then verification result acquisition is improved, but battery life decreases
Solution Approach 1:
The polling frequency is dynamically adjusted based on the verification process state. During active verification when the host is processing, the terminal polls at a moderate frequency to check for results. When verification is not in progress or the result is already received, polling frequency is reduced or stopped entirely. This dynamic adjustment ensures verification results are acquired in a timely manner while avoiding excessive polling that would drain the battery.
Data Source
AI summary
A wireless card reader system includes: a card reader terminal that is battery-driven and obtains card data for verification; a high-order host apparatus that verifies the card data, changes an operating state of a target device when a verification result is successful, and sends the verification result; and an interface apparatus that relays communication between the card reader terminal and the high-order host apparatus. The card reader terminal is operable in a normal mode or in a sleep mode. The card reader terminal switches to the sleep mode after sending the card data in the normal mode. The card reader terminal temporarily returns from the sleep mode to the normal mode to perform polling to the interface apparatus, and obtains the verification result. The polling is performed less frequently in a period before a state change than in a period after the state change.