Hardware Installation and User’s Guide
17
Hardware Installation
J1
-
SCSI bus termination jumper block.
These jumpers control SCSI termination for both
channels.
J4
-
IOP mode select jumper block
: This jumper is used to place the IOP in reset, which
enables the flash chip to be programmed to recover resident firmware. See
Appendix A
for a detailed description of jumper J4.
J5
-
SCSI termination power jumper block
- At least one device has to 5 volts
termination power to the SCSI bus.
2.2
Diagnostic Features
The SRCU42L has LED indicators, an 80db audible alarm, and boot-up beep sequences
that can help diagnose the controller.
Table 2-1. Controller Jumper Settings
Jumper Block
Jumper Position
Definition
J1
Jumper on A
Termination for channel A is on.
No jumper on A
Termination for channel A is off.
Jumper on B
Termination for channel B is on.
No jumper on B
Termination for channel B is off.
J4
Jumper on pins [1-2]
IOP is in reset mode with firmware recovery
enabled.
Jumper on pins [2-3]
IOP is in normal run mode.
No jumpers
IOP is in normal run mode.
J5
Jumper on A
Controller supplies termination power to
channel A.
No jumper on A
Controller does not supply termination power
to channel A.
Jumper on B
Controller supplies termination power to
channel B.
No jumper on B
Controller does not supply termination power
to channel B.
