Metrologic Instruments IS4921 用户手册

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Theory of Operation

Overview .........................................................................................................................................................16

Host Interface Signals .....................................................................................................................................17

Usage of Host Interface Signals ......................................................................................................................18

Power Mode Descriptions ...............................................................................................................................20

Serial Configurations .......................................................................................................................................22

Abbreviated ASCII Table .................................................................................................................................23

Operational Timing

Power Up/Boot Up...........................................................................................................................................24

Power Down/Suspend/Power Removed .........................................................................................................26

Decode Timing ................................................................................................................................................27

Summary of Operation Timings.......................................................................................................................28

Depth of Field vs Bar Code Element

IS4910 .............................................................................................................................................................29

IS4911 .............................................................................................................................................................30

Exposure Time for Image Acquisition ............................................................................................................31

Design Specifications

Operational ......................................................................................................................................................32

Mechanical ......................................................................................................................................................33

Environmental .................................................................................................................................................33

Electrical ..........................................................................................................................................................34

Detailed Electrical Specifications.....................................................................................................................34

Current Waveforms .........................................................................................................................................36

Imaging Engine and Decode PCB Terminations

Imaging Engine Interface Connector ...............................................................................................................38

Decode Board (USB & TTL) Interface Connector ...........................................................................................39

Decode Board (USB) Output to Host Connector .............................................................................................40

Decode Board (TTL) Output to Host Connector ..............................................................................................41

Flex Cable Specifications

Flex Cable Pinout – Imaging Engine Connection ............................................................................................42

Flex Cable Pinout – Decode Board Connection ..............................................................................................43

Dimensions......................................................................................................................................................44

Installation Notes .............................................................................................................................................45