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To create a Code 128 Barcode for a ZPL code and print it on a 300 dpi printer, you can follow these steps:

1. Open a text editor or ZPL design software such as ZebraDesigner or NiceLabel.

2. Type the ZPL code for a Code 128 barcode. For example:

^XA ^FO100,100^BY3 ^BCN,100,Y,N,N ^FD123456^FS ^XZ

This code will create a Code 128 barcode with a height of 100 dots, a width of 3 dots per module, and the data "123456".

1. Save the ZPL code and send it to the printer.

2. Make sure the printer is set to print at 300 dpi resolution. You can do this by checking the printer settings or by sending the command "^PRD300" in the ZPL code before the barcode command.

3. Print the label and verify that the barcode appears correctly.

Note: The exact ZPL code for the barcode may vary depending on the specific application or label design software being used. It's important to consult the printer's user guide or documentation for specific instructions and examples.