pjl commands

About this tag
PJL commands, or Printer Job Language commands, are used to control HP and compatible laser printers at a low level. A common application is changing the text on the printer's LCD status display by sending PJL commands over TCP port 9100. This technique, known as the HP Printer Display Hack, has been used since at least 1997 and can be adapted for tasks like displaying stock prices. The tag covers discussions of PJL command syntax, network printer hacking, and practical scripts that leverage PJL for custom printer interactions.

  1. Windows 7 The HP Printer Display Hack (with financial goodness)

    The HP Printer Display Hack is a simple background application that periodically checks the current price of a selected stock and sends it to the display of HP (and compatible) laser printers. IntroductionThis app is based on an old hack from back to at least 1997 that uses the HP Job control...
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