Gsale is compatible with any barcode scanner that supports Keyboard Emulation. This is a very common feature in modern barcode scanners. To test the configuration of your barcode scanner, open a text editing program such as word or notepad and the, with your cursor in the editor scan a barcode from a product. If the barcode scanner is working, you should see the text of the barcode show up in the editor window with a return afterwards so that the cursor is on the next line.
If you do not see any text in the editor, your barcode scanner is not working. Check that you have installed any needed drivers that go along with the scanner and that it supports and is configured for keyboard emulation.
If the barcode scanner did not enter a return after the scan, check the settings as this is usually a configurable option.