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HP Pcl 5 Manual

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Page 341

ENRaster Graphics Example 15-33 Figure 15-11 Example of Raster Graphic Image Data
  

Page 342

15-34   Raster GraphicsEN 

Page 343

ENIntroduction  16-1
16
Status Readback
Introduction  
This chapter describes the PCL status readback features. 
PCL status is requested from the printer with the commands 
described in this chapter. Following a status request, the printer 
generates a status response. This response consists of ASCII 
data which is sent directly from the printer, through the I/O, back 
to the host. Status readback allows you to obtain information 
from the printer such as: available printer (user) memory, 
current...

Page 344

16-2   Status ReadbackEN z
Flush All Pages Command 
zEcho Command 
zStatus Readback Programming Hints
For status readback to work, the host system must contain a 
bi-directional driver to receive status response data. In network 
operations, some printing environments do not support bi-directional 
communication, such as many printer sharing devices which spool 
data, and some network operating systems. Applications designed 
to incorporate PCL status readback should be designed to function 
correctly in...

Page 345

ENIntroduction 16-3
Entity Status          
It is possible to request status for the printer’s entities. An entity is a 
font, symbol set, macro, or user-defined pattern stored in the printer. 
Each individual entity request is limited to one specific entity, and is 
further limited to a specific location. To request entity status, you must 
send the entity status readback commands to identify a location type 
and a location unit, and then send the entity request command.
Location type refers to the...

Page 346

16-4   Status ReadbackEN
A basic entity status request is shown in the example below. This 
example identifies a status request for downloaded permanent fonts. 
The example also includes a status readback response at the bottom. 
Note that this example shows only one possible request/response; for 
more detailed information, refer to the status readback command 
descriptions provided later in this chapter.
In addition to the normal status responses, if an invalid request is 
made, the printer returns an...

Page 347

ENIntroduction 16-5
Status Response   
When the printer receives a status request (command), it processes 
that request and forms the response data. This data is then stored in 
an I/O status buffer. The response is saved in this buffer until it is 
either read (by any user) or the printer is turned off.
In addition to clearing the status buffer by reading the status response 
or by turning off the printer, status responses are cleared if one the 
following settings are changed:
zPrinter resolution...

Page 348

16-6   Status ReadbackEN
Status Response Syntax  
All status responses start with the letters “PCL” followed by a 
Carriage Return control code (decimal 13; ) and a Line Feed 
control code (decimal 10; ). In addition, each remaining line of 
the response is terminated by a Carriage Return and Line Feed 
control code. Finally, status responses are terminated by a Form 
Feed control code (decimal 12; ). The basic syntax for the 
status response is shown below.
PCL
INFO TITLE
KEYWORDn=DATAn
KEYWORDn=DATAn...

Page 349

ENStatus Response Syntax 16-7
PCL 
INFO FONTS 
SELECT=“(8U(s0p10.00h12.00v0s0b3T”
SELECT=“(0N(s0p16.67h8.5v0s0b0T”
SELECT=“(s1p__v1s0b4101T(78X”
SYMBOLSETS=“0D,0I,0N,0S,0U,1E,1F,1G,...”
SELECT=“(8U(s1p__v0s3b4148T”

NotesIn the example listings, “,” “,” and “” identify the 
Carriage Return (decimal 13), Line Feed (decimal 10), and Form 
Feed (decimal 12) control codes. The “” following the 
“SELECT=” keyword is a five character representation (the printable 
characters: “”) and does not identify an...

Page 350

16-8   Status ReadbackEN
Set Status Readback Location Type Command 
The Set Location Type command sets the status location type to the 
specified value. Location type is used in conjunction with the location 
unit to identify an entity location for a status request (Inquire Status 
Readback Entity command).
E
C * s # T 
# =0- Invalid location
1 - Currently selected
2 - All Locations
3 - Internal
4 - Downloaded Entity
5 - Cartridge
7 - User-installable ROM device (SIMMs)
Default =0
Range =0 - 5, 7
If a...
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