How does a ticket printer generate a QR code using commands? With the growing popularity of QR codes, many businesses now use them on receipts for promotions or as a payment method. But how exactly does a ticket printer produce a QR code when given specific commands?
Let's take an example: the QR code will display the text "WWW.OCOMINC.COM". To print this, you need to send a series of hexadecimal commands to the printer.
First, open a serial communication tool like a "Serial Port Debugger" or similar software that can send and receive hex commands. Then, input the following sequence:
- `1D 28 6B 30 67 07` – This command sets the size of the QR code. The value '07' represents a medium size. You can adjust it between 1 and 16 depending on your needs.
- `1D 28 6B 30 69 48` – This sets the error correction level. '48' corresponds to the lowest error correction level, while values up to 51 offer higher levels of error tolerance.
- `1D 28 6B 30 80 0F 00` – This tells the printer to prepare the encoding buffer for data.
- `77 77 77 2E 6F 63 6F 6D 69 6E 63 2E 63 6F 6D` – This is the hexadecimal representation of "www.ocominc.com".
- `1D 28 6B 30 81` – This command instructs the printer to print the QR code from the encoding buffer.
- `0A 0A 0A 0A` – These are line feed commands. Using multiple line feeds ensures the QR code isn't cut off by the paper cutter.
- `1D 56 01` – This is the paper cutter command. If you don’t want the printer to cut the receipt, you can skip this step.
Putting it all together, the full command sequence is:
`1D 28 6B 30 67 07 1D 28 6B 30 69 48 1D 28 6B 30 80 0F 00 77 77 77 2E 6F 63 6F 6D 69 6E 63 2E 63 6F 6D 1D 28 6B 30 81 0A 0A 0A 0A 1D 56 01`
This sequence will successfully print a QR code containing "www.ocominc.com" on a ticket printer that supports such commands. It’s important to test the commands with your specific printer model, as different manufacturers may have slight variations in their command syntax. Always refer to the printer’s technical documentation for exact details.
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