Kernel Commands; Introduction; Uel Command - Brother HL-Series Technical Reference Manual

Revision C 16/01/96

4. KERNEL COMMANDS

4.1. Introduction

This section explains three PJL command, UEL, ENTER and COMMENT. These commands provide
the minimum set of tools to operate job control.

4.2. UEL Command

The Universal Exit Command causes the printer to exit the current printer language and sets the printer
into PJL mode.
Syntax :
<ESC>%-12345X
• The UEL command is a data stream sequence.
• The UEL command indicates to the current printer language to finish a job. If PJL is available, PJL
commands which have not yet been executed are cancelled and the printer is ready to accept the next
PJL command.
• The UEL command must be placed in the first and last position of all PJL job command sequences.
• Printers which have an Auto I/O switching feature can use the UEL command in order to settle job
boundaries.
• The @PJL prefix which is placed at the beginning of a PJL job must follow immediately after the
UEL command .
• If the printer receives codes other than the PJL prefix, it enables the default printer language and
prints the job.
• ENTER command should be used in order to specify the printer language.
Example :
<ESC>%-12345X@PJL<CR><LF>
@PJL ENTER LANGUAGE = PCL <CR><LF>
<ESC>E.......PCL JOB........<ESC>E
<ESC>%-12345X
UEL command (Universal Exit Command)
ENTER command
COMMENT command
Chapter 3 "PJL" - 10