Zebra ZP 450 Guía de usuario descargar pdf (Pagina 44)

Operations & Options

Media Sensing

980546-003 B ZP 450™ User Guide 12/17/07

Media Sensing

The printer has automatic media sensing capability. The printer is designed to continuously

check and adjust media length sensing for minor variations. Once the printer is printing or

feeding media, the printer continually checks and adjusts the media sensing to accommodate

for minor changes in media parameters from label to label on a roll and from roll to roll of

media. The printer will automatically initiate a media length calibration if the expected media

length or the label to label gap distance has exceeded the acceptable variation range when

starting a print job or Feeding media. The automatic media sensing in the ZP-Series printers

works the same for printer operations that use EPL and ZPL label formats and programming.

If the printer does not detect labels or blacklines (or notches with blackline sensing) after

feeding the media the ZP 450 printer’s default maximum label length distance of 13 inches,

then the printer will switch to continuous (receipt) media mode. The printer will keep these

settings until changed by software, programming or a manual calibration with different media.

Optionally, the printer can be set to do a short media calibration after printer power up or when

closing the printer with power on. The printer will then feed up to three labels while

calibrating.

The printer’s media settings can be verified by printing a Printer Configuration label. See the

Printing a Test Label on page 14 for more details.

The maximum distance that the automatic media type detection and sensing will check can be

reduced by using the ZPL Maximum Label Length command (^ML). It is recommended that

this distance be set to no less than two times the longest label being printed. If the largest label

being printed was a 4 by 6 inch label, then the maximum label (media) length detection

distance can be reduced from the ZPL default distance of 39 inches down to 12 inches. Your

printer has a default distance of 13 inches

If the printer has difficulty automatically detecting the media type and auto-calibrating, see

Manual Calibration on page 49 to perform an extensive calibration. It includes a printed graph

of sensor operation for your media. This method disables the printer’s automatic media

sensing capability until the printer’s default parameters are reset to the factory defaults with

the four flash Feed button mode. See the Feed Button Modes on page 53 for more details.

The automatic media calibration can be modified, turned on or turned off to meet your needs.

Sometimes print job conditions require that the printer use all the media on a roll. The two

automatic media conditions, power up with media loaded and closing the printer with power

on, can be controlled individually with the ZPL Media Feed command, ^MF. The feed action

discussed in the ZPL programmers guide for the ^MF command is primarily for automatic

media sensing and calibration. The automatic media calibration that controls the dynamic

media (label to label) calibration is the ^XS command. If multiple media types of different

lengths, material or detection methods (web/gap, blackline or continuous) are used, you should

not change these settings.

The media calibration and detection process can also be refined to match the media type

loaded into the printer. Use the ZPL Media Tracking command (^MN) to set the media type.

Sometimes the printer can detect preprinted media as the gap between labels or the liner

backing with print as a blackline marks. If the ^MN parameter for continuous media is set, then

the print does not preform the automatic calibration. The ^MN command also includes an

automatic calibration parameter (^MNA) to return the printer to its default setting to

automatically detect all media types.

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