|Previous||Table of Contents||Next|
If you used the wrong printer type when you set up the printer with the LP print service, inappropriate printer control characters may be sent to the printer. The results are unpre-dictable: Nothing may print, output may be illegible, or output may be printed in the wrong character set or font.
Use the following steps to check the printer type:
elm% lpstat -p pinecone -l printer pinecone is idle. enabled since Wed Jan 2 18:20:22 PST 1991. available. Content types: PS Printer types: PS Description: Users allowed: (all) Forms allowed: (none) Banner not required Character sets: (none) Default pitch: Default page size: elm%
If the printer type is not correct, become superuser and type lpadmin-p printer-name -T printer-type and press Return.
Many formatting problems can result when the default stty (standard terminal) settings do not match the settings required by the printer. The following sections describe what happens when some of the settings are incorrect. Read the printer documentation to determine the correct stty settings for the printer port.
NOTE: If a printer is connected by a parallel port, the baud setting is irrelevant.
To display the current stty settings for the printer port, type stty -a < device-name and press Return. The current stty settings for the printer port are displayed.
elm# stty -a </dev/term/a speed 96ØØ baud; rows = Ø; columns = Ø; ypixels = Ø; xpixels = Ø; eucw 1:Ø:Ø:Ø, scrw 1:Ø:Ø:Ø intr = ^c; quit = ^ | ; erase = ^?; kill = ^u; eof = ^d; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^q; stop = ^s; susp = ^z; dsusp = ^y; rprnt = ^r; flush = ^o; werase = ^w; lnext = ^v; parenb -parodd cs7 -cstopb -hupcl cread -clocal -loblk -parext -ignbrk brkint -ignpar -parmrk -inpck istrip -inlcr -igncr icrnl -iuclc ixon -ixany -ixoff imaxbel isig icanon -xcase echo echoe echok -echonl -noflsh -tostop echoctl -echoprt echoke -defecho -flusho -pendin iexten opost -olcuc onlcr -ocrnl -onocr -onlret -ofill -ofdel tab3 elm#
To change the stty settings, type lpadmin -p printer-name -o stty=options and press Return.
You can change more than one option setting by including the options in single quotation marks and separating them by spaces. For example, suppose the printer requires you to enable odd parity and set a 7-bit character size. You would type a command such as the following:
#lpadmin -p clobber -o stty='parenb parodd cs7'
The stty option parenb enables parity checking/generation, parodd sets odd parity generation, and cs7 sets the character size to 7 bits.
To send a document to the printer, type lp -d printer-name filename and press Return. Look at the document to verify that it is printing correctly.
Table 11-10 shows the default stty options used by the LP print service's standard printer interface program.
|9600||Set baud rate to 9600.|
|cs8||Set 8-bit bytes.|
|-cstopb||Send 1 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."|
|-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.|
|nl0||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.|
Use Table 11-11 to choose stty options to correct various problems affecting print output.
|stty Values||Result||Possible Problem from Incorrect Setting|
|300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400||Sets baud rate to the specified value (enter only one baud rate)||Random characters and special characters may be printed and spacing may be inconsistent.|
|oddp||Sets odd parity||Characters are randomly missing or appear incorrectly.|
|evenp||Sets even parity|
|-parity||Sets no parity|
|-tabs||Sets no tabs||Text is jammed against right margin.|
|tabs||Sets tabs every eight spaces||Text has no left margin, is run together, or is jammed together.|
|-onlcr||Sets no return at the beginning of lines||Text has incorrect double spacing.|
|onlcr||Sets return at beginning of lines||Zigzags print down the page.|
|Previous||Table of Contents||Next|