Kodak 9500 manual Scsi Interface, Scsi overview Scsi bus

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5 The SCSI Interface

SCSI overview

SCSI bus

This chapter describes the SCSI interface used with the scanners.

For complete information on the appropriate SCSI specification, refer to SCSI-2 Working Draft ANSI X. 131-198X, Revision 6, 10/29/88.

The SCSI interface provides a means of communication between a maximum of eight computer and peripheral devices, giving the host computer independence within this system. As a result, tape drives, printers, optical disks, communications devices, etc., can be added to the host computer(s) without requiring modification to the generic system hardware or software. The interface uses "logical" rather than "physical" addressing for all data structures.

The SCSI bus allows communication between any two SCSI devices at a time. When two SCSI devices communicate on the bus, one acts as an initiator and the other acts as a target. The initiator is usually a host computer that originates operations, and the target is usually a peripheral controller that performs the operation. A SCSI device generally has a fixed role as an initiator or target, but some may assume either role. The scanner acts only as a SCSI target.

Access to the SCSI bus is handled through bus arbitration. The SCSI device with the highest priority (as determined by its SCSI ID bit) is given control of the bus. The SCSI device with an ID of 7 is the highest priority device. The initiator then selects a target and the target controls all further communications. Data transfers on the bus are asynchronous and follow a Request/Acknowledge handshake protocol. One 8-bit byte of information is transferred to the initiator with each handshake.

NOTE: The amount of time required to execute the SCSI commands is affected by the number of peripheral devices on the bus, as well as the priorities assigned to each peripheral device. Therefore, the amount of time required to execute the SCSI commands will vary based upon the system configuration. It is recommended that a dedicated host adapter be used with the scanner.

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Contents Integrator’s Guide Document size IntroductionAbout this guide Scanning documents SetupScanning Concepts Error handling March Interactive/online method Batch/offline method Fault recoveryImage Headers Image header contentsImage address ResolutionHeader flags Compression typeSkew Angle Bar code header informationImage Deskew Flag Image header format Offset Format Dynamic Data Set by CommandMarch Default Image Header Format Requested Resultant Last Transfer Retrieving images and headersTo read the header and then read the image Recommended retrieval methodsScsi data rates Scanner Host CommunicationsScsi overview Scsi bus Scsi InterfaceIssuing Scsi commands Scsi interface signal linesMarch Status Response Code Meaning Scsi status responsesMessage Code Direction Function/Action Scsi Spec Scsi message responsesScsi conformance Scsi command summary Scsi commandsCommand Op Command NumberCommand block descriptor Define Window Parameters commandCommand op code 24H Scsi Specification Section Define Window Parameters headerDefine Window descriptor bytes Descriptor Data Definition Define Window Parameters dataDescriptor Data Definition Command op code 25H Scsi Specification Section Get Window commandGet Window data Get Window Parameters headerGet Window Parameters header data Get Window descriptor bytes Get Window Parameters data Descriptor Data Definition Inquiry descriptor bytes Inquiry commandCommand op code 12H Scsi Specification Section Inquiry data Read data Read commandCommand op code 28H Scsi Specification Section Command op code 17H Scsi Specification Section Release Unit commandRequest Sense descriptor bytes Request Sense commandCommand op code 03H Scsi Specification Section ILI Request Sense dataDescription Seq. Id# Required Error Trans Panel Scan command Reserve Unit commandCommand op code 16H Scsi Specification Section Command op code 1BH Scsi Specification SectionSend data Send commandCommand op code 2AH Scsi Specification Section Command block Using the Send command for scanner- unique commandsCommand op code 00H Scsi Specification Section Test Unit Ready commandScanner-unique command format Scanner-unique CommandsScsi Command summaryMarch AX/Y/Z Cropping/ Auto Cropping CommandsDescription Values DX No scan EX Bit order Information returned is in the following format FX/Y/Z Compression GC Last image addressHC command sets the image address for the next document GX End of job HA Set mode HC Next image addressJA command Example JA Define modeJX/Y/Z Scan threshold Cont NX/Y/Z command selects the Noise filter for the current mode SX/Y/Z Reverse image TX Simplex/duplex status YX/Y/Z Border Reduction WX/Y/Z Skew Correction W command enables or disables document skew correctionTemporarily overriding a group of parameters Scanner-unique command samplesPermanently changing individual parameters Permanently changing a group of parameters Recommended usage of scanner-unique commands Usage Protocol Pinouts Sample interfaces Diagnostic Interface J45/COIN3Pin J45 Signals Appendix a Glossary Document image level Error diffusion modeGray scale image Gray levelsNoise Multilevel indexingNoise filter PatchScaling Scanner-unique commandScreening SeedAppendix B Reference Materials Accessory-specificOrdering publications United States and CanadaAppendix C Assigning Image Addresses March Image processing parameters Appendix D Image Processing Parameter DefaultsModes Parameter Command 13,17 14,18 11,15 12,16 Filter Table D-2 Scanner Recommended Image processing parameters∙ YX/Y/Z ∙ AX/Y/Z March Adaptive Threshold Processing separates the foreground Appendix E Image ProcessingTerminology Reverse imaging Simplex/duplex selection Image processing capabilitiesAuto-cropping Compression is used to reduce the number of bytes needed for Contrast without ATP 61122/A-61124 March 61122/A-61124 March Noise filter 61122/A-61124 March Product Resolution Base Resolution Dpi ResolutionScreening/Dithering Bit/pixel image. The thresholding value ranges from 0 to 61122/A-61124 March ATP Contrast settings Adaptive Threshold Processor ATP accessoryImage processing settings for the ATP Image a Image B Image C Image D ATP Threshold settingsSkew Detection and Correction Scanner/MicroimagerCorrection and auto-cropping work Auto-croppingExample Full width of Scanner Border reduction Border reductionSource image types Evaluating scanned imagesScanned images Printed ImagesPhotographic images Computer-generated imagesTarget Evaluation criteriaAliasing StaircasingFigure C Image resolution61122/A-61124 March By counting the number of black and white steps BrightnessDocument A G I N G
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9500 specifications

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