Quick Reference Guide (rev 5.00)
DC-390U2B/W SCSI Adapter
Tekram Technology Co., Ltd
3
Any SCSI device with SCAM (SCSI Configured AutoMatically) can assign its own SCSI ID
dynamically and resolves SCSI ID conflicts automatically. You do not need to manually
assign SCSI IDs to theses peripherals. See User’s Manual for details of how to enable
SCAM support.
SCSI Device Activity LED Indicator (JP1)
JP1 is used to indicate activity of the SCSI devices controlled by the DC-390U2B/W, and
should be connected to the cable leading to the Hard Drive LED on the front panel of your
computer case.
Connecting the SCSI Peripherals
Model #
External
Internal
DC-390U2B
J1
: 68-pin; 16-bit (wide Ultra2)
J2
: 68-pin; 16-bit (wide Ultra2)
DC-390U2W
J2
: 68-pin; 16-bit (wide Ultra2)
CN1
: 50-pin; 8-bit
CN2
: 68-pin; 16-bit (wide)
J1
: 68-pin; 16-bit (wide Ultra2)
External SCSI connector:
This high density D-type SCSI connector is for connecting
external SCSI devices.
Internal SCSI connector:
The internal flat cable should connect to the internal SCSI
connector with its colored stripe, normally red, aligned with Pin 1 of the connector.
Maximum length
of the SCSI bus is determined by the number of devices and the data
transfer rate. The maximum allowable cable lengths for the DC-390U2B/W is 12.5 meters
(41 feet).
If there are internal devices connected, the internal cable length must be included in the
measurement of SCSI bus length
Note:
For DC-390U2B,
mixing Fast/Ultra devices with Ultra2 devices brings the entire SCSI bus
to Ultra SCSI speed and cable requirements.
For DC-390U2W
, it is recommended that you keep your Ultra2 devices on connectors J1
and J2, non Ultra2 devices on CN1 and CN2.
Mixing Ultra2 devices with non Ultra2
devices will bring the Ultra2 devices to Ultra SCSI performance level
.
