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LPR Printing
TCP/IP Host Setup
7-2
RTEL
Lantronix supplies RTEL host software, which requires installation and
configuration on the host but provides more functionality than remote-LPR. It
allows the host’s lp or lpr printing system to transparently use the Server print
devices, and also allows the creation of named pipe devices on the host that
map to the Server’s ports.
The RTEL backend filter interfaces with the host-based spooling system. It
receives data from the spooling system and sends the data to the Server. The
advantages of the backend filter are that the banner page is printed at the front
of a job, multiple copies can be printed, and simple reformatting such as <LF>
to <CR><LF> conversion and tab expansion can be performed. However, the
backend filter does not support any complicated output filtering or
conversions.
The RTEL Pipe Daemon process (RTELPD) uses a UNIX named pipe as its
interface to the host. This allows any host-supplied or user-supplied backend
filter to be used for printing. Any data that is sent into the pipe is simply moved
to the Server. However, the data flow is one-way from the host system to the
Server and this approach does require one RTELPD daemon process for each
print queue configured.
TCP Socket Connects The Server supports direct TCP connections to its ports. These connections
provide 8-bit clean full-duplex data communication, but they do require that
the user provide his or her own software. The RTEL software includes an
example program showing how to form these connections.
The TCP Socket interface does not support queueing. If the resource is busy
when a connection attempt is made, the connection will be rejected.
7.2 LPR Printing
There are several important things to note about the LPR printing method:
◆
Windows for Workgroups, Windows 95, Windows 98, and Windows 200 do not support LPR
directly; however, Lantronix has provided a peer-to-peer printing solution on the distribution CD-
ROM.
◆
Because of the way the LPR protocol is typically implemented on the host, the processing options and
banner page are sent after the job data itself. The Server will print a banner page at the end of a job,
and cannot support most of the LPR options. If it is necessary to have the banner page at the beginning
of the printout, install and use the RTEL software. If banners are not needed, they can be disabled.
◆
The Server cannot print multiple copies of the print job when using the “-#n” lpr option.
◆
If two print queues on the host refer to two services on the same Server, they must use separate
spooling directories.
◆
No special purpose input or output filters can be used when printing via LPR. If this functionality is
necessary, use the named pipe interface program in the RTEL print queue configuration software.