HP 5100tn Printer Job Language - Technical Reference Manual - Page 125
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Comments: When the printer receives the INFO command, it returns the requested information. Only one category can be used for each INFO command. Each category is described below, with the format of the printer's response. If the printer does not support the specified category, the returned information is as follows: @PJL INFO category "?" ID Category The INFO ID command provides a way to identify the type of printer used. For the HP LaserJet 4 printer, the INFO ID command prompts the printer to return the following response: @PJL INFO ID "LASERJET 4" Note To maintain compatibility with future printers, applications should not use the INFO ID command to identify printer features. Instead, the more detailed INFO CONFIG command should be used (see the following discussion on "The CONFIG Category"). Some printers, such as the HP LaserJet 4ML printer, return "HP" in front of the model name, for example: @PJL INFO ID "HP LASERJET 4ML" Status Readback Commands 7-17