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Programming Tips for Using PJL 11-23

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When processing a job, I/O switching paces off all I/O interfaces except for the one which is providing the current print job. However, it is possible for an application to get a few bytes of data into the inactive I/O interface before the printer paces off that I/O interface. If the application times out while trying to send the initial UEL command after one or more bytes of the command are sent, but before the entire UEL command is sent, then the application can proceed using one of the following choices: 1) continue attempting to send the data to the printer, 2) remember how much of the initial UEL command has been sent to the printer and attempt to send the rest of the command at a later time, or 3) stop trying to send the command, making sure the next command the application sends to the printer is the UEL command. This is done so the parser inside the printer properly recognizes all commands following the previously sent partial UEL command. The printer will properly recognize the UEL command, even if the command appears after a partial UEL command. For example, assume the initial query is: %-12345X@PJL ECHO 08/27/92 09:53:46.5 ~033288925 If the printer only accepts "%-12", and if the application later sends: %-12345X@PJL ECHO 08/27/92 09:57:46.5 ~6202323802 The printer accepts the query and responds with: @PJL ECHO 08/27/92 09:57:46.5 6202323802 One of the conditions I/O-switching printers use to determine when to switch to another I/O interface is the idle time of the I/O interface supplying the current print job. Idle time is defined as the time elapsed since the I/O interface received the last data byte. If the application queries the printer and waits for a response, it is possible for I/O interface idle time to exceed the set timeout value (the TIMEOUT environment variable). When the printer detects the current I/O interface timed out, the printer allows I/O switching and treats any data received over the I/O interface as unrelated to the data previously received over that interface. EN Programming Tips for Using PJL 11-23

Section	Page
Main Menu	3
Inside This Manual	5
Manual Organization	6
Related Documents	9
Manual Conventions	10
Contents	11
Introduction to PJL	15
What is PJL?	15
The Benefits of PJL	17
Who Should Use PJL?	17
Compatibility With Non-PJL Printers	18
PJL Command Syntax and Format	21
Introduction	21
Syntax Conventions	22
Format of PJLCommands	24
PJL Syntax Rules	25
Types of Variables	27
Processing Invalid Commands	29
Using PJL	31
Introduction	31
Overview of How Commands are Used	31
PJL Job Requirements	33
Some Sample PJLJobs	34
What's Next?	35
Command Groupings by Functionality	36
Kernel Commands	41
Introduction	41
Universal Exit Language (UEL) Command	42
ENTER Command	44
COMMENT Command	46
Methods of Printer Language Switching	47
Job Separation Commands	49
Introduction	49
JOB Command	50
EOJ Command	56
PJL Job Security	58
Password Protection of Default Feature Settings	58
Control Panel Lock	59
Disk Lock	59
Job Cancellation	61
Start of Job Notification	61
End of Job Notification	62
Job Cancellation Unsolicited Status	63
Environment Commands	65
Introduction	65
Print Environments	66
Changing Environment Settings	69
Environment Summary	70
PJL Reset Conditions	72
Key Points to Remember About Environments	74
PJL Environment Variables	75
General PJL Environment Variables	76
Port-Specific Variables (LaserJet4PJ Only)	90
PCL-Specific Variables	91
PostScript-Specific Variables	95
ESC/P-Specific Variables	96
Setting the Printer to a Desired State	98
DEFAULT Command	100
INITIALIZE Command	103
RESET Command	106
SET Command	109
Status Readback Commands	113
Introduction	113
Printer Status Requirements	115
Synchronizing Status Readback Responses	115
Format of Status Readback Responses	116
INQUIRE Command	117
DINQUIRE Command	122
ECHO Command	126
INFO Command	128
USTATUS Command	143
TIMED Variable	152
USTATUSOFF Command	154
Job Recovery	155
Sending the Initial Job	155
After Job Failure	156
Device Attendance Commands	159
Introduction	159
RDYMSG Command	160
OPMSG Command	163
STMSG Command	165
PJL File System Commands	169
Introduction	169
FSAPPEND Command	171
FSDIRLIST Command	173
FSDELETE Command	175
FSDOWNLOAD Command	176
FSINIT Command	177
FSMKDIR Command	178
FSQUERY Command	179
FSUPLOAD Command	181
File System Example	183
Job Management	187
Introduction	187
HP LaserJet 8100 Printer	187
HP LaserJet 8500 Printer	191
Programming Tips for Using PJL	195
Introduction	195
PJL Services	196
Print Data Generators	197
Printer Utilities	199
Spoolers	205
Requesting Printer Status	212
Using Status Readback in a Multi-User System	212
Product-Specific Feature Support	223
Introduction	223
PJL Feature Support	224
PJL Environment Variable Support	228
HP LaserJet IIISi Comments	265
Comments about HP LaserJet Printers	266
LaserJet Printers with Reduced-Function Control Panels	273
Color LaserJet Printer Comments	274
HP DeskJet 1200C and 1600C Printer Family Comments	274
HP LaserJet 5Si/ 5SiMx/5Si Mopier Comments	278
HP LaserJet 5Si Mopier Comments	279
HP LaserJet 4000 and 5000 Series Comments	281
HP LaserJet 1100 Series Comments	283
HP LaserJet 2100 Series Comments	284
HP Color LaserJet 4500 Series Comments	285
HP LaserJet 8000 and 8100 Series Comments	286
HP Color LaserJet 8500 Series Comments	287
PJL Command Summary	289
Programming Examples	295
Introduction	295
PJL Status Codes	301
Status Code Groupings	301
Informational Messages (10xxx) *	302
Background Paper Loading (11xyy)	304
Background Paper Tray Status (12xyy)	306
Output Bin Status (15xxy)	307
PJL Parser Errors (20xxx)	307
PJL Parser Warnings (25xxx)	309
PJL Semantic Errors (27xxx)	310
Auto-Continuable Conditions (30xxx)	311
PJL File System Errors (32xxx)	313
Potential Operator Intervention Conditions (35xxx)	314
Operator Intervention Conditions (40xxx)	316
Foreground Paper Loading (41xyy)	319
Paper Jam Messages (LaserJet 5Si/5SiMx only) (42xyy)	320
Optional (External) Paper Handling Device Messages (43xyy)	322
LaserJet 4000 / 5000 Series Paper Jam Messages (44xyy)	323
Hardware Errors (50xxx)	324
Glossary	327
Index	335
Symbols	335
Numerics	335
A	335
B	335
C	335
D	335
E	336
F	336
H	336
I	336
J	337
K	337
L	337
M	337
N	337
O	337
P	338
Q	339
R	339
S	339
T	339
U	339
V	340

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Programming Tips for Using PJL 11-23

When processing a job, I/O switching paces off all I/O interfaces

except for the one which is providing the current print job. However, it

is possible for an application to get a few bytes of data into the

inactive I/O interface before the printer paces off that I/O interface. If

the application times out while trying to send the initial UEL command

after one or more bytes of the command are sent, but before the

entire UEL command is sent, then the application can proceed using

one of the following choices: 1) continue attempting to send the data

to the printer, 2) remember how much of the initial UEL command has

been sent to the printer and attempt to send the rest of the command

at a later time, or 3) stop trying to send the command, making sure

the next command the application sends to the printer is the UEL

command. This is done so the parser inside the printer properly

recognizes all commands following the previously sent partial UEL

command. The printer will properly recognize the UEL command,

even if the

command appears after a partial UEL command.

For example, assume the initial query is:

<ESC>%-12345X@PJL ECHO 08/27/92 09:53:46.5

033288925

If the printer only accepts "

<ESC>%-12

", and if the application later

sends:

<ESC>%-12345X@PJL ECHO 08/27/92 09:57:46.5

6202323802 <LF>

The printer accepts the query and responds with:

@PJL ECHO 08/27/92 09:57:46.5 6202323802<LF>

<FF>

One of the conditions I/O-switching printers use to determine when to

switch to another I/O interface is the idle time of the I/O interface

supplying the current print job. Idle time is defined as the time elapsed

since the I/O interface received the last data byte. If the application

queries the printer and waits for a response, it is possible for I/O

interface idle time to exceed the set timeout value (the TIMEOUT

environment variable). When the printer detects the current I/O

interface timed out, the printer allows I/O switching and treats any

data received over the I/O interface as unrelated to the data

previously received over that interface.