Selecting Internal Terminator Power; Selecting External Terminator Power - Black Box 2 x 2 SCSI Matrix Switch SC121A User Manual

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.
E14-Port A
E13-Port B
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.
Internal 5V
External
Terminator
Power
SC120A-R2
E20-Port 1
E19-Port 2
Factory default is "Enabled" on all ports.
CHAPTER 5: Configuration and Operation
1
E13, E14, E19, E20
2
E15, E16, E21, E22
3
E15-Port A
E16-Port B
NOTE
E5, E6, E21, E22
or
E17–E20
NOTE
or
SC121A
E21-Port 1
E22-Port 2
25