Black Box SW487A-R2 Selecting Internal Terminator Power, Selecting External Terminator Power

6 x 4 ELECTRONIC SCSI SWITCH

5.3 Selecting Internal Terminator Power

Onboard SCSI Switch terminators can be powered by internal 5-volt power or externally from SCSI-bus “termination power” (TERMPWR).

Figure 5-1. Internal terminator-power jumpers.

Table 5-1. Jumper settings for internal termination.

E1 - Port A	E3 - Port C	E5 - Port 1	E7 - Port 3	E29 - Port 5
E2 - Port B	E4 - Port D	E6 - Port 2	E8 - Port 4	E30 - Port 6

NOTE

The standard factory default connects internal terminators to internal 5-volt power.

5.4 Selecting External Terminator Power

The SCSI Switch can supply external terminator power via an internal resettable fuse. This fuse supplies 1 amp at 5 volts to the TERMPWR signal. The SCSI Switch contains internal protection and will not be affected if other SCSI devices provide terminator power.

E19-E28

Figure 5-2. External terminator-power jumpers.

Table 5-2. Jumper settings for external termination.

E19 - Port A	E23 - Port C	E20 - Port 1	E24 - Port 3	E27 - Port 5
E21 - Port B	E25 - Port D	E22 - Port 2	E26 - Port 4	E28 - Port 6

NOTE

The standard factory default connects internal terminators to internal 5-volt power.

24