Barcode scanner is a necessary part of modern life. When you buy commodities in supermarket, you may see it in the checkout counter. If you run a retail shop or chain store, you may use barcode reader for inventory management. All in all, it can be seen almost everywhere. So, here we sum up two frequently asked questions about barcode scanner.
Q1: What are the interfaces of barcode scanner?
A1: USB, RS232, TTL232, KB interfaces common interfaces for scanner.
For USB and Keyboard interface, it can scan bar code data directly and input computer, and the advantages is driver free. And it has no external power supply.
Serial mode: it obtains bar code data by the serial port and needs an external power supply.
TTL mode: it scan bar code via TTL level, and need further develop decoding and other circuits. It can not be used directly.
Q2: What are the main reasons why barcode scanner can’t read barcodes?
A2:
1) Failed to enable to read this bar code type.
2) The printed barcodes are not in good quality. Or bars and empty contrast is too low, or the gap between the strip and the empty is not appropriate.
3) Check if the scanner was interfered by direct sunlight, which may affect the scanning.
4) Check if bar code surface was covered with transparent material, or the brightness is too high or to low.
5) Hardware failure.
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