Universal Exit Language (Uel) Command - HP Color LaserJet 5500 Technical Reference Manual

Universal Exit
Language (UEL)
Command
Syntax:
Parameters:
Comments:
4-2 Kernel Commands
The Universal Exit Language (UEL) Command causes the
printer to exit the active printer language. The printer then
returns control to PJL.
Note
Use the UEL command at the beginning and end of every
PJL job. You do not need a UEL command before every PJL
command. The examples demonstrate using this command.
<ESC>%-12345X
The UEL command does not use any parameters.
The UEL command is a data stream sequence recognized
by all printer languages in PJL printers. The UEL
command instructs the active printer language to finish
processing the current job and relinquishes control to PJL.
If PJL is active, any unprocessed PJL commands are
discarded and the printer is ready to accept the next PJL
command.
Note
If the printer is processing a PostScript job and TBCP is
enabled, the UEL command causes the printer to exit
PostScript and enable PJL.
Remember that:
All jobs must start and end with the UEL command.
Printers that support I/O switching use the UEL
command as one way to determine job boundaries,
indicating when to perform I/O switching (see the
"Timeouts" section in Appendix A).
At the beginning of a PJL job, the PJL command prefix
(@PJL) must immediately follow the UEL command. If
the printer receives any characters, spaces, or control
codes before @PJL, it enables the default printer
language and processes the job in that printer language