HP CP6015dn Service Manual - Page 160
DIMM slot, Firmware, Nonvolatile memory, PJL overview, PML, Control panel
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DIMM slot The DIMM slot can be used to add memory or fonts. There are two memory DIMM slots. Slot 1 is closest to the outside of the formatter. Slot 2 is closest to the hard disk. Firmware The firmware is contained on NAND flash memory soldered on the formatter board. A remote firmware upgrade process is available, which overwrites the firmware in the NAND flash. Nonvolatile memory The product uses nonvolatile memory (NVRAM) to store I/O and print-environment-configuration information. The contents of NVRAM are retained when the product is turned off or disconnected. PJL overview The printer job language (PJL) is an integral part of configuration, in addition to the standard printer command language (PCL). With standard cabling, the product can use PJL to perform a variety of functions, such as these: ● Two-way communication with the host computer through a network connection or a USB connection. The product can inform the host about such things as the control-panel settings, and the control-panel settings can be changed from the host. ● Dynamic I/O switching. The product uses this switching to be configured with a host on each I/O. The product can receive data from more than one I/O simultaneously, until the I/O buffer is full. This can occur even when the product is offline. ● Context-sensitive switching. The product can automatically recognize the personality (PS or PCL) of each job and configure itself to serve that personality. ● Isolation of print environment settings from one print job to the next. For example, if a print job is sent to the product in landscape mode, the subsequent print jobs print in landscape only if they are formatted for landscape printing. PML The printer management language (PML) allows remote configuration and status readback through the I/O ports. Control panel The formatter sends and receives product status and command data to and from a control-panel PCA. 118 Chapter 5 Theory of operation ENWW
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