IBM OPTIONS User Manual page 19

With the Automatic termination setting, the adapter detects if SCSI cables are
connected to any of the two SCSI connectors. The adapter then sets termination
as needed. If you need to manually set the SCSI adapter termination, see
"Appendix B. Using SCSISelect" on page B-1 for more information.
Step 7. Connecting internal devices
Follow these steps to connect internal SCSI devices.
1. Mount each SCSI device in the computer.
2. Connect the 68-pin cable into the connector for 16-bit Wide SCSI devices (J1
in the adapter illustration).
3. Connect the internal devices into available connectors at the end of the
SCSI cable farthest from the adapter to ensure best signal quality. Connect
pin-1 on each cable connector to pin-1 on each device throughout the bus.
Otherwise your SCSI devices will not work properly.
4. Connect the power cable for each device to the internal power connector, as
needed.
Step 8. Connecting the LED cable (Optional)
Most computers have a light-emitting diode (LED) on the front panel that
lights up when the hard disk drive is accessed. You can attach the LED cable
to the SCSI adapter instead, so it lights up to indicate activity on the SCSI bus.
Follow these steps to connect the LED cable to the SCSI adapter.
Note: If you change the LED connection and your computer includes non-SCSI
disk drives, the LED will no longer indicate non-SCSI disk activity.
1. Unplug the LED cable from the connector on your computer system board.
Refer to your computer documentation to locate the LED cable. If needed,
you can use the 4-pin LED cable included with this option.
2. Connect the LED cable connector 1 to the external LED connector 2 on
the SCSI adapter as shown in the following illustration.
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Part 2: Installation and user's guide
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