Compaq AA-RHGWC-TE manual Setting the TZ88N-TA Scsi ID, Cabling the TZ88N-TA

Table 8–2: Hardware Components Used to Create the Configuration Shown in Figure 8–2 (cont.)

Callout Number	Description
8	DWZZA-VA with H885-AA trilink connector
9	DWZZB-VW with H885-AA trilink connector

aThe maximum length of the BN38C (or BN38D) cable on one SCSI bus segment must not exceed 25 meters.

bThe maximum length of the BN37A cable must not exceed 25 meters.

cThe maximum combined length of these cables must not exceed 25 meters.

8.1.3 Setting the TZ88N-TA SCSI ID

The TZ88N-TA SCSI ID is set with a push-button counter switch on the rear of the unit. Push the button above the counter to increment the address; push the button below the counter to decrement the address until you have the desired SCSI ID selected.

8.1.4 Cabling the TZ88N-TA

You must connect the TZ88N-TA tabletop model to a single-ended segment of the shared SCSI bus. It is connected to a differential portion of the shared SCSI bus with a DWZZA-AA or DWZZB-AA. Figure 8–7 shows a configuration of a TZ885 for use on a shared SCSI bus. You can replace the TZ885 shown in the illustration with a TZ88N-TA. To configure the shared SCSI bus for use with a TZ88N-TA, follow these steps:

1.You will need one DWZZA-AA or DWZZB-AA for each TZ88N-TA.

Ensure that DWZZA jumper J2 or DWZZB jumpers W1 and W2 are installed to enable the single-ended termination.

Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2.Attach a trilink connector to the differential end of the DWZZA or

DWZZB.

3.Connect the single-ended end of a DWZZA to the TZ88N-TA with a BC19J cable.

Connect the single-ended end of a DWZZB to the TZ88N-TA with a BN21M cable.

4.Install a H8574-A or H8890-AA terminator on the other TZ88N-TA SCSI connector.

5.Connect a trilink or Y cable to the differential shared SCSI bus with BN21K or BN21L cables. Ensure that the trilink or Y cable at the end of the bus is terminated with an H879-AA terminator.

Configuring a Shared SCSI Bus for Tape Drive Use 8–5