HP Model 735 hp 12x speed CD-ROM disk drive user's guide (a1658-90703) - Page 24

Bus T, ermination Guidelines

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Introduction SCSI Bus Termination Guidelines There are certain guidelines to follow when terminating a SCSI bus. CAUTION: Unless the SCSI bus is properly terminated, the bus will not operate. Terminators provide impedance matching on SCSI bus signal lines. • The last device connected to the SCSI bus must be terminated with a SCSI terminator. Use a Hewlett-Packard K2291 50-pin low-density bail-lock active terminator or a Hewlett-Packard C2904A high-density thumbscrew active terminator to terminate the last SCSI option device. • Any termination on other devices on the bus must be removed. This includes external termination plugged into a SCSI receptacle on the device, or internal resistor packs. (Refer to peripheral device or system configuration manuals for termination information.) 1-14

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Introduction
1–14
SCSI
Bus T
ermination Guidelines
There are certain guidelines to follow when terminating a SCSI bus.
CAUTION:
Unless the SCSI bus is properly terminated, the bus will not
operate. Terminators provide impedance matching on SCSI bus
signal lines.
•
The last device connected to the SCSI bus must be terminated with a SCSI
terminator. Use a Hewlett-Packard K2291 50-pin low-density bail-lock active
terminator or a Hewlett-Packard C2904A high-density thumbscrew active
terminator to terminate the last SCSI option device.
•
Any termination on other devices on the bus must be removed. This includes
external termination plugged into a SCSI receptacle on the device, or internal
resistor packs. (Refer to peripheral device or system configuration manuals for
termination information.)