What kinds of alarm detection does the thermal print head have? The following small series explains to you:
Print head inspection mainly includes: paper detection, print head temperature detection and pressure bar detection. Both temperature detection and paper detection are analog signals that need to be converted to digital values ​​on abc to determine. The pressure bar detection only needs to be connected to the ordinary io port or external interrupt.
1, paper detection
Mainly judge the status of the paper, including: out of paper, black mark and normal. Generally, it is best to judge with the pressure bar test together.
2, pressure bar detection
It is used to judge whether the print head lever is raised or not, and it can be detected whether the paper bin is opened.
3, temperature detection
The temperature at the heating point of the printhead is detected, and it is necessary to pause the printing on the program to achieve print head protection when the temperature is overheated.
The pressure bar and temperature detection are very simple. It should be noted that the temperature detection is the same as the paper detection. The voltage divider resistor should be a precision resistor with 1% precision.
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