Lexmark X864 Forms and Bar Code Technical Reference - Page 32

PCL5 emulation: Lexmark

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5 PCL5 emulation: Lexmark This section discusses the Lexmark-specific commands implemented in the Forms and Bar Code Card. The HP-specific section is found immediately preceding this section. New PCL5 commands to support bar codes Support of new bar code functionality (for example, two-dimensional symbology PDF417) requires new Lexmark-unique PCL5 definitions that provide access to the new functionality. Two new commands are implemented, ESC&x#W and ESC&y#W. Bar code descriptor ESC&x#W[descriptor data] This new escape sequence is used to describe not only what bar code to print, but all of the parameter settings required to build the bar code. The first two bytes of this command designate the symbology. The remaining bytes are then interpreted accordingly, based on the symbology. Each symbology has its own defined descriptor header. The first two bytes are required. The remaining bytes are optional. If those bytes are not sent, the settings are set to appropriate defaults. The number of bytes of descriptor data is indicated by #. Transfer bar code data ESC&y#W[bar code data] This new PCL5 command is used to transfer a raw block of bar code data to be encoded. The bar code data is encoded according to what was specified in the last valid bar code descriptor command received. If no valid descriptor is sent, then this command is ignored and the data is flushed. The number of bytes of descriptor data is indicated by #. Compatibility safeguard These two new commands, if sent to an HP printer, are flushed and nothing prints. There is a possibility that a future HP PCL5 enhancement could utilize the two escape sequences that have been chosen, forcing future Forms and Bar Code Card PCL5 emulations to honor the HP versions of these commands and to ignore them in a bar code context. To avoid this conflict, use the PCL5 Lexmark enhancement switch. Setting or not setting this switch would let a future Forms and Bar Code Card PCL5 emulation decide which way to interpret the new escape sequences. The switch is a GL/2 command: PCL5 emulation: Lexmark 29

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PCL5 emulation: Lexmark
29
5
PCL5 emulation: Lexmark
This section discusses the Lexmark-specific commands implemented in the Forms and Bar Code
Card.
The HP-specific section is found immediately preceding this section.
New PCL5 commands to support bar codes
Support of new bar code functionality (for example, two-dimensional symbology PDF417) requires
new Lexmark-unique PCL5 definitions that provide access to the new functionality. Two new
commands are implemented,
ESC
&x#W
and
ESC
&y#W
.
Bar code descriptor
ESC
&x#W[descriptor data]
This new escape sequence is used to describe not only what bar code to print, but all of the
parameter settings required to build the bar code. The first two bytes of this command designate the
symbology. The remaining bytes are then interpreted accordingly, based on the symbology. Each
symbology has its own defined descriptor header. The first two bytes are required. The remaining
bytes are optional. If those bytes are not sent, the settings are set to appropriate defaults. The
number of bytes of descriptor data is indicated by #.
Transfer bar code data
ESC
&y#W[bar code data]
This new PCL5 command is used to transfer a raw block of bar code data to be encoded. The bar
code data is encoded according to what was specified in the last valid bar code descriptor command
received. If no valid descriptor is sent, then this command is ignored and the data is flushed. The
number of bytes of descriptor data is indicated by #.
Compatibility safeguard
These two new commands, if sent to an HP printer, are flushed and nothing prints. There is a
possibility that a future HP PCL5 enhancement could utilize the two escape sequences that have
been chosen, forcing future Forms and Bar Code Card PCL5 emulations to honor the HP versions of
these commands and to ignore them in a bar code context. To avoid this conflict, use the PCL5
Lexmark enhancement switch. Setting or not setting this switch would let a future Forms and Bar
Code Card PCL5 emulation decide which way to interpret the new escape sequences. The switch is
a GL/2 command: