Digi PortServer TS 8 Setup Guide download pdf (Page 24)

4-2 Configuration Considerations

Configuration Considerations

You should be aware of the following considerations if you intend to configure PortServer TS 8/16

to handle printers.

Using RealPort

RealPort, a feature that allows network-based host systems to use the ports of the PortServer TS

8/16 as though they were the host system’s own ports, is an easy and efficient way for printers to use

PortServer TS 8/16 ports. For information on this option, see "Configuring Ports for RealPort" on

page 3-1.

Determining Your Printer’s Flow Control Requirements

If you set the PortServer TS 8/16 flow control parameters incorrectly, the printer may not print all

data sent to it. Consequently, before you configure a PortServer TS 8/16 port for a printer, check the

printer’s documentation to determine if it uses hardware flow control, software flow control, or no

flow control at all.

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 PortServer TS 8/16 use the same flow

control scheme.

• Most 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 PortServer TS 8/16 port (usually CTS or DCD) that can be used for flow control.

Printing with AIX Systems

Digi does not recommend using lpd to print multiple jobs to a PortServer TS 8/16-attached printer

from an AIX print spooler because this may cause the print job to time out.

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 PortServer TS 8/16:

1. The number of copies option with lpr is not supported.

2. Banner pages are not supported.

3. Give the PortServer TS 8/16’s DNS name or IP address as the remote system’s name.

4. Specify a queue name that conforms to the following conventions:

• Begin the queue name with one of the following character strings: (a) Use ascii if you want

PortServer TS 8/16 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 PortServer TS

8/16 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.)

Examples

String Result

ascii_1 Prints to port 1 and translates CR to CR/LF.

ascii_8_f Prints to port 8, translates CR to CR/LF and prints a form feed at the end

of the job.

raw_1_d Prints to port 1 with no translation and appends a Ctrl-d to the end of the

print job.

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Digi PortServer TS 8 Setup Guide Page 24

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