HP 3150 HP PCL/PJL reference - Printer Job Language Technical Reference Manual - Page 185
Eighth Command, PJL File System Commands 9-17
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The Alphanumeric ID command needs to know the number of bytes being sent after the terminating W. In this example, we are sending 8 bytes. The first byte, which is the ♣ symbol, is the control-byte (The ♣ symbol is the character with a decimal value of 005). This control byte indicates that the Alphanumeric ID command will be used to associate the current macro ID to the string ID. The other 7 bytes are the characters that make up the string ID (a_macro). Eighth Command &f4X The Macro Control command with a value of 4 enables automatic overlay for the macro with the last specified ID. That is, this command prints the macro. Note that &f2X and &f3X will also work here. Ninth Command E The Printer Reset command causes the printer to print and eject the page. It also restores the User Default Environment and deletes temporary fonts and macros. Tenth Command %-12345X This PJL command causes the printer to exit the active printer language and return control to PJL. Eleventh Command ~@PJL DEFAULT DISKLOCK = ON This command sets the disk or flash memory to read-only. In this state, it is not possible to format the disk, download fonts or macros, or delete fonts or macros. EN PJL File System Commands 9-17