User guide

Chapter 4 Configuring Ports for Printers 19
Configuration Considerations
You should be aware of the following considerations if you intend to
configure device server to handle printers.
Using RealPort
RealPort, a feature that allows network-based host systems to use the
ports of the device server as though they were the host system’s own ports,
is an easy and efficient way for printers to use device server ports. For
information on this option, see "Configuring Ports for RealPort" on page 15.
Flow Control Tips
Here are some tips to ensure that your printer performs as expected:
• If flow control is necessary, ensure that the printer and device server
use the same flow control scheme.
• Some printers that use hardware flow control issue the DTR (data
terminal ready) signal when they are ready for data. If so, the DTR
pin on the cable from the printer must be wired to an input on the
device server port (usually CTS) that can be used for flow control.
Using the lpd Protocol
Here are some tips for configuring the print spooler on your UNIX system
when you intend to print using the lpd protocol to a printer attached to
device server:
• The number of copies option with lpr is not supported.
• Banner pages are not supported.
• The device server’s DNS name or IP address is the remote system’s
name.
• Queue names must conform to the following conventions:
— Begin the queue name with one of the following character
strings: (a) Use ASCII if you want device server to substitute
carriage return and line feed characters for each line feed the
system sends. (b) Use raw if no substitution should be
performed.
— After the queue name, insert an underscore character and the
number of the device server port to which the printer is attached.
— If you want to use either of the following options, specify an
additional underscore and then the letter that identifies the
option: (a) Use f to append a form feed character to the end of
each file in a print job (b) Use d to add a Ctrl-d to the end of each
file in a print job. (This is often required by PostScript printers.)
Chapter 4
Configuring Ports for Printers