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Example Printing
System
Figure 10-1 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 Bi-Tronics 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 10-1, 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.
10-20 Programming Tips
Содержание 4600 - Color LaserJet Laser Printer
Страница 18: ...1 6 Introduction to PJL ...
Страница 36: ...3 8 Using PJL ...
Страница 46: ...4 10 Kernel Commands ...
Страница 66: ...Figure 6 1 How Environments Affect the Print Job 6 4 Environment Commands ...
Страница 108: ...6 46 Environment Commands ...
Страница 180: ...9 18 PJL File System Commands ...
Страница 212: ...10 32 Programming Tips ...
Страница 262: ...B 6 PJL Command Summary ...
Страница 302: ...Glossary 10 ...