HP LaserJet 1005 HP PCL/PJL reference - Printer Job Language Technical Referen - Page 222
Printer Status Readback and Printer I/O Switching
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Given the above structure for sending queries and processing responses, applications should adhere to the following guidelines: 1 If the application sends data to the printer in blocks, followed by long pauses between blocks (i.e., greater than five seconds), then it should cause the printer to use a larger I/O interface idle time value by using the PJL JOB command as described in the "Printer Status Readback and Printer I/O Switching" section. 2 Check status readback availability as described in the "Determining if Printer Status Readback is Available" section. 3 Synchronize with the printer-to-host data stream as described in the "Old Printer Status Readback Responses" section. 4 Do not have more than five outstanding queries before accepting printer status readback responses. This prevents response data loss as described in the "Response Data Buffer Overflow" section. 5 Before quitting, turn off all unsolicited status enabled by the application. Also, accept all responses from the printer that were generated because of actions performed by the application. 6 Do not be dependent on the timing characteristics of a single printer model. For example, the response time of the HP LaserJet 4 printer's built-in IEEE-1284-compatible I/O interface will be different than the timing characteristics of a IEEE-1284- compatible interface in an I/O card installed into the printer. 11-28 Programming Tips for Using PJL EN