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System Administration Guide: Advanced Administration

Adjusting Printer Port Characteristics

The printer port characteristics set by the LP print service must be compatible with the printer communication settings. If the default printer port settings provided by the LP print service do not work with a printer, refer to the printer manual from the manufacturer to find out what settings the printer requires from the LP print service. Use the stty command to set and display printer communication settings.

The following table shows the default stty settings used by the LP print service.

Table 7–1 stty Default Settings Used by the LP Print Service

Option 

Meaning 

-9600

Set baud to 9600 

-cs8

Set 8-bit bytes 

-cstopb

Send one stop bit per byte 

-parity

Do not generate parity 

-ixon

Enable XON/XOFF (also known as START/STOP or DC1/DC3) 

-opost

Do “output post-processing” using all the settings that follow in this table 

-olcuc

Do not map lowercase to uppercase 

-onlcr

Change line feed to carriage return/line feed 

-ocrnl

Do not change carriage returns into line feeds 

-onocr

Output carriage returns even at column 0 

-n10

No delay after line feeds 

-cr0

No delay after carriage returns 

-tab0

No delay after tabs 

-bs0

No delay after backspaces 

-vt0

No delay after vertical tabs 

-ff0

No delay after form feeds 

How to Adjust the Printer Port Characteristics

  1. Log in as superuser, lp, or assume an equivalent role on the print server.

  2. Adjust the printer port characteristics. 


    # lpadmin -p printer-name -o "stty=options"

    -p printer-name

    Name of the printer for which you are adjusting the port characteristics. 

    -o "stty=options”

    Sets the port characteristic (stty option) specified by options.You can change more than one stty option setting with this command. Enclose each option in single quotation marks and use a space to separate the options. For a complete list of options, see stty(1). Table 7–1 shows the default stty settings used by the LP print service.

  3. Verify that the printer port characteristics have been changed.


    # lpstat -p printer-name -l

Examples—Adjusting the Printer Port Characteristics

The following example shows how to set the port characteristics for the printer luna. The parenb option enables parity checking/generation, parodd sets odd parity generation, and cs7 sets the character size to 7 bits.


# lpadmin -p luna -o "stty='parenb parodd cs7'"

The following example shows how to set the terminal baud rate to 19200 for the printer venus. 


# lpadmin -p venus -o "stty=19200"