Printer Control Unit Communication Speed Mismatch Recovery
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Solution Overview
Problem
In multi-function printers (MFPs), communication between the control unit and printer unit becomes impossible when the control unit is reset and the communication speeds are mismatched, leading to failed data transmission due to the printer unit not receiving setting requests at the lower communication speed.
Innovation Solution
A controller with a first control unit that sets a first communication speed and transmits a predetermined command, and a second control unit that determines if a response is received, setting a second communication speed and sending a reset command when no response is received, ensuring communication speed matching and preventing communication failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control unit sends a setting request signal at the first communication speed to match communication speeds after a reset, then the communication speed can be adjusted to match the printer unit, but the printer unit cannot receive the setting request signal because it is still set to the second communication speed, causing communication to become impossible
Solution Approach 1:
The control unit performs preliminary actions by first setting the communication speed to the first communication speed after a reset, then sending a setting request signal to the printer unit. This preliminary setup ensures that the control unit is ready to receive and process settings from the printer unit, preventing communication failures.
Solution Approach 2:
The system implements feedback by having the control unit send a setting request signal to the printer unit and wait for a setting complete signal in return. This feedback mechanism ensures that the communication speed matching is successful and both units are synchronized, preventing communication breakdowns.
2Ease of operation
If the first communication speed is set for the control unit after a reset, then the control unit can communicate with the printer unit at a lower speed, but the printer unit cannot receive setting requests because it is still configured for the second communication speed
Solution Approach 1:
The communication speed is made dynamic by allowing the control unit to switch between the first communication speed (after reset) and the second communication speed (normal operation). This dynamic adjustment ensures that the control unit can initially communicate at a lower speed after a reset and then upgrade to higher speed communication once the printer unit is properly configured, preventing information loss.
3Reliability
If the communication speed is not matched between the control unit and printer unit after a reset, then the control unit can operate with a lower communication speed, but data transmission fails due to speed mismatch
Solution Approach 1:
The control unit performs preliminary action by setting the communication speed to the first communication speed after a reset, ensuring stable initial communication. Then, it sends a setting request signal to the printer unit to upgrade the communication speed to the second speed, maintaining both reliability and productivity.
Solution Approach 2:
The system uses feedback by having the control unit send a setting request signal and wait for a setting complete signal from the printer unit. This feedback ensures that the communication speed is successfully matched between both units, maintaining reliable data transmission at high speed without failures.
Data Source
AI summary
A printing apparatus which prevents communication from becoming impossible. The printing apparatus has a control unit and a printer unit. At start-up of the control unit, a first communication speed is set as a communication speed for communication between the control unit and the printer unit, and also a predetermined command is transmitted to the printer unit. Whether or not a response to the predetermined command has been received from the printer unit is determined. As a result of the determination, when no response to the predetermined command has been received from the printer unit, a second communication speed different from the first communication speed is set as the communication speed for the communication between the control unit and the printer unit, and also, a reset command is transmitted to the printer unit.