Datalogic Matrix 300 Reference Manual

Also see for Matrix 300: Quick reference guide

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Datalogic Matrix 300 Reference Manual Manual pdf 132 page image

MATRIX 300™ REFERENCE MANUAL12077.5.6 Extending DOF Using Alternative Acquisition Group (Input Select)NOTE: Do not use Interactive mode in VisiSet™ to set this feature.Multiple Image Acquisition Settings assigned to different Acquisition Groups (Standard andAlternative) can be configured and enabled to extend the reader's depth of field. The specificAcquisition Group (Standard or Alternative) is selected prior to the reading phase so that onlythe correct group setting will be applied to the entire reading phase.When only two Image Acquisition Settings are used to extend DOF, (one in each group), thiseffectively allows switching DOF while keeping the lens refocusing delay outside the readingphase.This feature is recommended for high speed applications.NOTE: Within each group, if more than one Image Acquisition Setting isenabled they will be cycled as in the case where Alternative Group Select isdisabled.Example:Read a 15 mil Data Matrix ECC 200 code covering a range from 140 to 320 mm (see 15 milreading diagram) at an application speed of 1 m/s. The reading distance range is too long tobe covered by a single acquisition setting, so two acquisition settings could be used in whichthe first has a Reading Distance of 195 mm and is assigned to the Alternative AcquisitionGroup, and the second has a Reading Distance of 300 mm and is assigned to the StandardAcquisition Group.By assigning the Alternative Group Select parameter to a proximity sensor (i.e. S3Z)mounted at least 150 ms before the Acquisition Trigger and connected to an input (i.e.Input 2), the correct DOF can be selected by enabling the correct group.As an example, for a conveyor speed of 1 meter/second the Alternative Group Selecttrigger must be placed at least 150 mm before the reading phase start (Ext. Trigger).The proximity sensor must be calibrated to trigger on packs in the near zone (140-215 mm)and therefore selects the Alternative Group with the Image Acquistion setting relative to the195 mm Reading Distance. Packs farther away do not trigger the proximity sensor and so theStandard Group is selected with the Image Acquistion setting relative to the 300 mmReading Distance.The settings overlap in the range 210-220 mm and can be read by either one.In this way the effective reading DOF covers the 140 -320 mm distance.