HP 2500 HP PCL/PJL reference - Printer Job Language Technical Reference Manual - Page 145

Comments: Unsolicited status allows you to automatically receive device, job, page, or timed status without requesting it. Each type of unsolicited status provides different information and is described on the following pages. Some printer models may have more (or fewer) types of unsolicited status than DEVICE, JOB, PAGE, and TIMED. You can have the printer list the various types of unsolicited status by issuing the INFO USTATUS command. See "Example: Using the INFO USTATUS Command" for an example of this. Unsolicited status, except for TIMED, can be turned off individually using the OFF parameter, such as in the USTATUS JOB=OFF command. TIMED status is turned off by setting it to zero. Alternatively, all unsolicited device status can be turned off using the USTATUSOFF command. DEVICE Variable The USTATUS DEVICE = value command prompts the printer to send status messages when device changes occur. When DEVICE = ON, the printer sends status information for all changes to printer status. When DEVICE = VERBOSE, the printer also sends status information for all PJL parser warnings and errors. Part of the unsolicited status message sent to the host is a 5-digit code that indicates the status condition. The first 2 digits divide the status codes into different categories. The general status categories are listed in the following table. (This is only a general summary of the specified categories. The full status code listing is located in Appendix D.) If there is a "DISPLAY=string" portion of the status message, the string is localized; the same message as that displayed on the control panel appears in whichever language is being used. EN Status Readback Commands 7-33