HP 4550 Service Manual - Page 272
Pjl Info Id, Pjl Info Ustatus, Pjl Info Count, Pjl Job, Pjl Echo, Pjl Ustatus Job=on/off
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Note @PJL INFO ID This command identifies the printer type to the host for reference when selecting printer drivers for automatic installation. The command syntax is: @PJL INFO ID @PJL INFO USTATUS This command queries the state of unsolicited JOB status. PAGE and TIMED status are not supported. The syntax is: @PJL INFO USTATUS @PJL INFO PAGECOUNT This command returns the number of pages printed by the engine. @PJL JOB This command informs the printer of the start of a PJL job and synchronizes the job status information. The printer counts print jobs, including nested jobs, incrementing the job counter for the @PJL JOB command and decrementing it for @PJL EOJ. The printer accepts the NAME= parameter and returns the name string in the unsolicited JOB start status message (if unsolicited job status is enabled). The printer transmits the unsolicited JOB status message to every I/O channel that has enabled this function. This message's format is: @PJL USTATUS JOB START [NAME=] The printer resets the nested job counter whenever it switches the source to a different I/O channel. This prevents a corrupt job on one channel from disrupting the activities on another channel. @PJL EOJ This command identifies the end of a print job and is a hint for the I/O switching algorithm. The printer counts nested jobs and recognizes job boundaries when the counter decrements to zero. The printer ignores isolated EOJ commands. Each EOJ must be preceded by a JOB command. @PJL ECHO This printer supports the ECHO command which transmits its parameters over the I/O channel to the host that issued the command. @PJL USTATUS JOB=ON/OFF This command enables or disables the JOB status for the I/O channel that delivers the command. @PJL USTATUSOFF This command disables the unsolicited JOB status for the I/O channel that delivered the command. For this printer, it duplicates the function of @PJL USTATUS JOB=OFF, AND @PJL USTATUS DEVICE=OFF. All commands not supported by this printer's PJL command set are returned with the message @PJL XXXX?. 270 Troubleshooting C7085-90921