Black Box SC120A-R2 User Manual download pdf (Page 26)

CHAPTER 5: Configuration and Operation

5.3 Selecting Internal Terminator Power

On-board SCSI Switch terminators can be powered by internal 5-volt power or

externally from SCSI-bus “terminator power” (TERMPWR).

Figure 5-4. Internal terminator-power jumpers.

Table 5-1. Jumper settings for internal termination.

SC120A-R2 SC121A

E14-Port A E20-Port 1 E15-Port A E21-Port 1

E13-Port B E19-Port 2 E16-Port B E22-Port 2

NOTE

The standard factory default connects internal terminators to internal

5 volts.

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 terminator-power (TERMPWR)

signal. The SCSI Switch contains internal protection and will not be affected if

other SCSI devices provide terminator power.

Figure 5-5. External terminator-power jumpers.

NOTE

Factory default is “Enabled” on all ports.

Internal 5V

External

Terminator

Power

E13, E14, E19, E20

E15, E16, E21, E22

E5, E6, E21, E22

E17–E20

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Black Box SC120A-R2 User Manual Page 26