User`s guide

SCSI Bus Signal Converters
6.4 Terminating SCSI Buses
6.4 Terminating SCSI Buses
All SCSI buses are terminated at the physical ends of the bus or cable. This is
true even when using a SCSI bus signal converter. Both DWZZA SCSI bus signal
converters supply terminator power (TERMPOWER) to the SCSI terminators.
TERMPOWER is current limited by self-resetting fuses.
The following sections describe the procedures for configuring a DWZZA for either
end-bus (see Section 6.4.1) or mid-bus (see Section 6.4.2) operation.
CAUTION
Removing the DWZZA SCSI bus signal converter or disconnecting the
SCSI cable when the power is on can cause the SCSI bus to malfunction.
6.4.1 End-Bus SCSI Bus Signal Converter Terminators
Use the following procedure to install the single-ended and differential
terminators when the DWZZA-series SCSI bus signal converter is installed
in the end-bus position.
CAUTION
To prevent damage, the SBB bezel should be removed as few times as
possible and minimal pressure used when pushing down on the mounting
tabs.
CAUTION
Do not attempt the following procedure unless you have taken proper
precautions against electrostatic discharge (ESD). When you remove the
cover from any enclosure or device, wear an ESD grounding wrist strap.
1. Turn off the power.
2. Disconnect the SCSI cables.
3. Remove either the SBB bezel and cover or the desktop cover.
4. Install jumper J2, the single-ended SCSI–2 bus termination (see Figure 6–2),
to terminate the single-ended bus.
6–6 SCSI Bus Signal Converters