7.4. ECHO Command; Examples ; Syntax - Page 273

CHAPTER 5 PJL - 64 

Examples  

Example 1 : 

This example requests the current print environment settings for RET, PAPER, and ORIENTATION : 

<ESC>%-12345X@PJL <CR><LF> 
@PJL COMMENT ***Requesting*** <CR><LF> 
@PJL COMMENT about User Default Settings** <CR><LF> 
@PJL ECHO 20:30:00 02-20-1993<CR><LF> 
@PJL DINQUIRE RET<CR><LF> 
@PJL DINQUIRE PAPER<CR><LF> 
@PJL DINQUIRE ORIENTATION<CR><LF> 
<ESC>%-12345X 

The printer may return, for example, the following response against the above 

DINQUIRE

 commands:  

@PJL ECHO 20:30:00 02-20-1993 <CR><LF> 
<FF> 
@PJL DINQUIRE RET<CR><LF> 
LIGHT<CR><LF> 
<FF> 
@PJL DINQUIRE PAPER<CR><LF> 
LETTER<CR>LF> 
<FF> 
@PJL DINQUIRE ORIENTATION<CR><LF> 
LANDSCAPE<CR><LF> 
<FF> 

Example 2 : 

This example requests the PCL-specific settings. 

<ESC>%-12345X@PJL <CR><LF> 
@PJL COMMENT ***Inquiring PCL settings*** <CR><LF> 
@PJL ECHO 20:33:05 02-20-1993 <CR><LF> 
@PJL DINQUIRE LPARM:PCL FONTSOURCE <CR><LF> 
@PJL DINQUIRE LPARM:PCL FONTNUMBER <CR><LF> 
<ESC>%-12345X 

The printer may return the following response for the above 

DINQUIRE

 commands : 

@PJL ECHO 20:33:05 02-20-1993 <CR><LF> 
<FF> 
@PJL DINQUIRE LPARM : PCL FONTSOURCE <CR><LF> 
I<CR><LF> 
<FF> 
@PJL DINQUIRE LPARM : PCL FONTNUMBER <CR><LF> 
15<CR><LF> 
<FF> 

7.4.

ECHO Command 

The 

ECHO

 command requests the printer to send back a specified message,  in order to ensure that the 

printer is ready for communication with the application and that the received answer from the printer is what 
the application requested.  The application must send this command before starting PJL communication. 

After sending the 

ECHO

 command, the application must ignore any status information from the printer 

before it receives the response from this command, because not receiving the response from this command 
means that the printer is still processing the previous job and its status information is for the previous job 
environment.  When the application receives the correct response for the requested 

ECHO

 command, the 

printer is now ready for the application and you can be sure that the status information following is for the 
requested command by the application.   

Syntax  

@PJL ECHO [< 

words

 >] [<CR>]<LF>