HP 28642A manual SCSI-2

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SCSI-2

Complies with the SCSIspecilication X3.131 - 1990. SCSI-Zprovides extensionsand further standardization of SCSI-l.

SCSI address

The octal representation of the unique address (0 to 7) assignedto each device on an SCSI bus. For bus arbitration, higher addresseshavepriority over lower addresses. SCSI addressesare typically assignedduring installation. The host adapter is typically assigned“7”.

SCSI bus

The collection of unbroken SCSI signal limesthat interconnect SCSIdevices

SCSI ID

SCSI identification. The bit-significant representation of the SCSIaddressreferring to one of the bus signallines DB (7 through 0). Seealso, SCSI address.

self-test

A diagnostic test to checkhardware components and circuitry.

slot divider

An assemblyusedto convert a double-high (6U) HP-PB I/O slot into two single-high (3I.l) slots. Also referred to asa “two-boardadapter”.

sfnglesnded signal

Also referred to as“unbalancedsignal”. During electrical transmissionand reception, signalsare deteminedby the voltage of a single line relative to a common ground. Becauseof electrical noise causedby ground loops at evenshort distances (common mode noise),single-ended SCSI signals are limited to 6 metersmaximum and lower data rates. A single-ended SCSI bus is incompatible with a differential SCSIbus. Therefore, useonly single-ended SCSI deviceswith the SCSI/parallel adapter card. Seealso,differential signal.

Glossary 5

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Contents HP 28642A HP-PB Scsi HP 28655A HP-PB SCSI/ Parallel HP HP 5960-3126 El091@Hewlett-Packard Company, 1991. AI1rights rcservcd Safety ConsiderationsPrint History Installation and S&vice HP 28642A and HP 28655A at a Glance Product Description This Book Table of Contents Page Installing HP 28642A/28655AAdapter Lnstalllng the HP 28642A/28655A Adapter Observe Antlstatic Precautions Prepare to Install the Adapter CardVerify Product Contents Gather Tools and Accessories Needed Record Adapter Card Identification InformationPeripheral to 92222A Dependent requirements that are not noted hereTable l-l. Scsi Cables LengthsDescription meters Remove Data corruption Installing the AdapterShut Down the System and SwZtch Off the Computer CreateCheck the Card’s Hardware Configuration Figure l-4. Default Switch Settings Installing the Adapter Set the Desired Parity-Checking CapabUityScsi Bus = closed = open Installing the Adapter l-9Set the Scsi Bus Address AddressVerify that Resistor Packs are Properly Installed Two resistor packsmust be installedInstall and Connect the Card Select an Appropriate SlotHP-Pa Standard Power Symbol Computer hardware limitations for l/O cards, if any Record the Slot NumberSystemperformance implications, if any Prepare the Slot For Use Ignment Hole Page Card guides. If the problem persists,get help Insert the Card into the SlotSupplied with this product provides a thumbscrew connector Attach the Card CablesConnect Your Single-Ended Scsi Devices Installing the Adapter l-19Connect Your Peripheral Devices Properly on the SCSIbusTerminate the Scsi Bus Device operation on the SCSIbus 12. Scsi Bus Example Installing the Adapter Scsi Cable Length ExampleReassemble your computer TurnPowerOn to Peripherals, Then to the ComputerConnect Your Parallel Device, If Applicable Two meters24Installing the Adapter Signal NameIn/Out Pin25 Turn Power On to Peripherals, Then to the Computer Data corruption or loss,or damageto hardwareHP-UX Systems Set Up the Operating SystemMPE XL Systems Verify Operation ServiceInformation Service Information Field Replaceable Units Exchange AssemblyExchange adapter card assembly Flgure 2-1. Location of Board Component FRUsBoard Components Other FRUsShould be performed by authorized servicepersonnel only Troubleshooting ToolsSelf-lestFailure Self-Test Failure LED Boot failure occursOperation. Refer to your systemreference manuals Scsipba and Centpba Diagnostics Troubleshooting ChecklistDoes any device require a special SCSIterminator? Removal/Replacement Instructions Removal/Replacement of the Card For card removal, follow the procedures belowAlso be determined from the,scsipbadiagnostic Removal/Replacement of Card ComponentsMinimize touching the connector pins Service Information 2-lDamagewasextensive, you may need a new component Type and ratingFlgure 2-3. Replacing the Termpwr Fuse Service Information DiagnosticCan continue to operate normally Reshipment Guidelines General Technical Specifications1green IElectrical +5 Vdc IPhysical IEnvironmentalGlossary ConfigurationAmerican National StandardsInstitute Backplane FRU Host adapter Seeadapter HP-PBParallel port Complies with the Scsi specification X3.131 GlossaryPrecision Bus See HP-PB SCSI-2 Termination Index Index tCable Card version...14FRUs...2-3 Identification information...l-4 installingPart number...2-3 Field replaceable units se-eFRUS HP Precision Bus SeeHP-PB HP-PBPhysical specifications...2-16 Index Loopback hood...2-4Resistor pack...&10 PowerProduct contents...13 Self-test failure LED...2-6 shut downTroubleshooting..2-8 Storing adapter cards...l-3 switchDuring installation/removal..J-6,1-19,2-10 Ylrlbo~5960-3126 El091