How do I connect up the device ID switch in an external case?
The ID switches in external SCSI cases are designed to be as flexible as possible because there is no standard for how ID pins on SCSI devices are to be layed out. This flexibility however means that the user has to be creative! Usually there are 4 wires coming from the switch (five if it’s WIDE). They are: • ID bit 0 (value of 1) • ID bit 1 (value of 2) • ID bit 2 (value of 4) • ID bit 3 (if WIDE) (value of 8) • Common ground The ID pins are usually specified pretty clearly on the documentation that came with the drive, but they rarely show which pins are grounds. To find the common ground pins (without guessing) you need an Ohmeter. Find which side of the pin pairs is connected to the drive chassis and to each other. Connect the common ground lead from the switch to any one of these pins.
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