HP I Dual Channel Ultra160 SCSI Host Adapter A6829A manual

Installing the A6829A Adapter

Specifying SCSI Parameters

Table 2-4

Summary of A6829A Auto Termination Conﬁgurations

Jumper Position

Auto Termination

Feature

Termination

Applied on

Adapter

1An external terminator might be required on the adapter, depending on the SCSI bus conﬁguration. If you need an external terminator for the A6829A, use SCSI LVD/SE terminator (HP product number C2370A).

Using the Jumper for Controlling Auto Termination

The A6829A adapter has two sets of pins that control enabling and disabling of the auto termination feature. The pins—labeled A_TERM and B_TERM—are at the end of the HBA that is opposite to the bulkhead connectors. Figure 1-1 on page 20 shows where the pin sets are located on the adapter. A_TERM controls the auto termination feature for channel A, and B_TERM controls the feature for channel B.

The default setting of each pin set on the A6829A HBA is the open position (the jumper is on only one pin of its pin set). This is the auto termination enabled state. In this state, the A6829A automatically senses whether a cable from a powered SCSI device is attached and provides the proper termination (depending on whether a powered device is present).

To disable auto termination on the adapter, change the jumper from the default open position to the shorted position (the jumper is on both pins of the pin set). This is the auto termination disabled state.