Adaptec 3940AUW Installation Guide - Page 6
Connecting SCSI Devices
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5 Connecting SCSI Devices Caution: AHA-3940AU/AUW host adapters support only single-ended SCSI devices. Do not connect differential SCSI devices, because they may damage the host adapter. Read the SCSI device documentation if you are not sure whether the device is single-ended or differential. Connecting Cables SCSI devices are cabled together in a single, connected series called the SCSI bus. SCSI cables must run sequentially from one device to the next, with no branching. 1 Lay out the cables and find the pin-1 element of each cable and device connector. On internal cables, pin 1 is usually marked with a contrasting color on one edge of the ribbon cable, and a small triangle or number 1 marks pin 1 on the SCSI connector. External cables can only be plugged in one way, so pin-1 orientation is automatic. 2 Attach the SCSI cable(s) to the host adapter and the device(s), using the internal and/or external connector(s). Be sure to maintain correct pin-1 orientation throughout the bus for each channel. If you are connecting 8-bit SCSI devices to Channel A of an AHA-3940AUW, you may use the internal 50-pin connector. If you must connect 8-bit SCSI devices to Channel B you will need 68-pin-to-50-pin converters. Refer to the User's Guide for detailed information or Adaptec's homepage under Cables. On the AHA-3940AU host adapter, SCSI Channel A has one internal 50-pin connector J1. Channel B has one external J2 and one internal 50-pin connector J6. The AHA-3940AUW Channel A has one internal 68-pin connector J1, one internal 50-pin connector J4. Channel B has one internal 68-pin J2 and one external 68-pin connector J5. 5 AHA-3940AU/AUW Installation Guide Part Number: 511418-00, Rev. A Print Spec Number: 496346-00 Current Date: 3/12/97 ECN Date:3/10/97
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