System information

HSD10 Operation
VAX 4000 Model 108 User Information
4-7
Setting the HSD10 DSSI-to-SCSI Bus Adapter Device Configuration
To set the switches on the HSD10 DSSI-to-SCSI bus adapter module board before you
install the adapter in a VAX 4000 Model 108 system, locate the configuration switchpack
see Figure 4-1). The device configuration switchpack contains 8 switch elements, divided
into DSSI ID and SCSI ID sections as shown in Figure 4-1.
Selecting and Setting the DSSI ID
The HSD10 DSSI-to-SCSI bus adapter is connected to the standard DSSI bus 0 on the
VAX 4000 host computer and is externally accessible through the DSSI port on the rear of
the system.
Each device on the DSSI bus requires a unique device address in the range of 0 through 7.
The DSSI ID of the HSD10 is factory set to 0; you may need to change this ID to one that
is currently not being used on your system.
Setting the HSD10 DSSI-to-SCSI Bus Adapter Device Configuration
Table 4-3 lists the sections of SW2 used for setting the DSSI ID and the corresponding
settings for each DSSI ID.
Table 4-3 HSD10 DSSI ID Switch Settings
DSSI ID SW2-1 SW2-2 SW2-3
0 (Default) Open Open Open
1 Open Closed Closed
2 Open Closed Open
3 Open Open Closed
4 Closed Open Open
5 Closed Open Closed
6 Closed Closed Open
7 Closed Closed Closed
Use the following procedure to set the DSSI ID: