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Example Printing System, Printer Status Readback and Printer Sharing

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Example Printing System Figure 11-1 contains an example printing system. The print system contains one I/O-switching LaserJet printer which is connected to seven computers. Host computer #1 is connected via the serial I/O interface. Host computers #2 and #3 are connected through an external printer sharing box that also buffers print job data. The printer sharing box is connected to the printer through the IEEE-1284compatible I/O interface. Network servers #4 and #5 spool print jobs from network clients #6 and #7. Although all the network clients and spoolers are connected to the same network cable as the printer, only the two network servers are capable of communicating directly with the printer. In this example, the network clients spool print jobs to a network server; they can not interact directly with the printer. Given the printing system as shown in Figure 11-1, not all of the printing system components can query the printer and expect a response back. Printer Status Readback and Printer Sharing Host computer #1 is directly connected to the printer via the bi-directional serial I/O link. If the software on the host computer supports bi-directional printer communication, applications on host computer #1 can expect the printer to respond to queries. However, at the time an application on host computer #1 requests information, the printer may be processing a print job from a different I/O interface, so the response to host computer #1's query may be delayed, as described in the "Printer Status Readback and Printer I/O Switching" section in this chapter. Host computers #2 and #3 are connected to the printer via an external printer sharing box that buffers data. If the printer sharing box was not designed to support bi-directional communication with the printer, then applications on host computers #2 and #3 will not be able to receive printer status readback information. However, since the printer sharing box is connected to the printer via the Bi-Tronics I/O interface, which does support bi-directional communication, it is possible for printer sharing boxes to be designed to support printer status readback. In fact, the printer sharing box itself may be able to inject a "print job" to query the printer for specific information. External printer sharing boxes can be designed to support sending data from the printer to the host computer. However, the printer sharing box has to determine which host computer should receive the EN Programming Tips for Using PJL 11-19

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 11-19

Example Printing System

Figure 11-1 contains an example printing system. The print system

contains one I/O-switching LaserJet printer which is connected to

seven computers. Host computer #1 is connected via the serial I/O

interface. Host computers #2 and #3 are connected through an

external printer sharing box that also buffers print job data. The

printer sharing box is connected to the printer through the IEEE-1284-

compatible I/O interface. Network servers #4 and #5 spool print jobs

from network clients #6 and #7.

Although all the network clients and spoolers are connected to the

same network cable as the printer, only the two network servers are

capable of communicating directly with the printer. In this example,

the network clients spool print jobs to a network server; they can not

interact directly with the printer.

Given the printing system as shown in Figure 11-1, not all of the

printing system components can query the printer and expect a

response back.

Printer Status Readback and Printer Sharing

Host computer #1 is directly connected to the printer via the

bi-directional serial I/O link. If the software on the host computer

supports bi-directional printer communication, applications on host

computer #1 can expect the printer to respond to queries. However, at

the time an application on host computer #1 requests information, the

printer may be processing a print job from a different I/O interface, so

the response to host computer #1's query may be delayed, as

described in the “Printer Status Readback and Printer I/O Switching”

section in this chapter.

Host computers #2 and #3 are connected to the printer via an

external printer sharing box that buffers data. If the printer sharing box

was not designed to support bi-directional communication with the

printer, then applications on host computers #2 and #3 will not be

able to receive printer status readback information. However, since

the printer sharing box is connected to the printer via the Bi-Tronics

I/O interface, which does support bi-directional communication, it is

possible for printer sharing boxes to be designed to support printer

status readback. In fact, the printer sharing box itself may be able to

inject a “print job” to query the printer for specific information.

External printer sharing boxes can be designed to support sending

data from the printer to the host computer. However, the printer

sharing box has to determine which host computer should receive the