View Full Version : HELP! SCSI ID Connectors

12-28-2000, 07:27 PM
Following the instructions on your "Roll" pages. Good until I got to the SCSI ID connectors. Following instructions on http://www.macgurus.com/graphics/mgscsiultraid21.html. I cannot figure how to connect these wires. I have a 4-bay enclosure into which I am installing 2 Cheetah 73 GB LVD drives (ST173404LW). Your instructions mention a "0" pin but none is identified on the drive legend or the pamphlet that came with the drive. I see the carats on the large connectors, but don't see how black leads can go on the bottom row of pins when there is only one black wire per lead bundle. Each bundle has 3 large connectors and 3 small. I hope I am not just too dense to see the solution. Thanks.

12-29-2000, 01:22 AM
hmmmm....do your ID selector switches support 15 addresses or 7?

on the rear of the drives, you want to use the pins between the power connector and the LVD connector. The 0-pin may be identified in the Seagate pamphlet as a 1-pin. In any case, we mean the pin farthest to the upper-right. That is your base pin, and that is the pin that will get the connector with the caret.

now, to determine the order, from right to left, from the base pin to the last one used, look at the switches in the backplane of your enclosure. See the wires where they interface? What is the order of the wires, beginning with the one with the caret, and proceeding to the last one? If you have an MAP enclosure, like those which we sell, whatever color is at the bottom is your base wire. You then go in order from bottom to top. On the rear of the drive, you go in the same order, from right to left. Typically, we're talking about red-brown, and yellow-grey, right?

the single black ground wire goes over the pin second from the left on the lower row.

do one drive at a time, scan your bus, and ensure that the ID of the drive corresponds to the ID you set on the switch. Then, shut-down, change the switch ID number, and reboot and scan again to confirm that the change registers correctly. If it does, pull the drive gently, and tack down those connectors on the rear of the drive with a small amount of hot-glue to keep them secure. The last thing you need is for those connectors to wiggle off due to sustained vibration three years from now when you are in the middle of a job. It happens.


good luck, and happy hacking!

12-29-2000, 04:04 PM
Thanks, Magician. Your reply helped straighten this out. The catch for me was that the color connectors go HORIZONTALLY across the top row and the black HORIZONTALLY on the left pins on the bottom row. This somehow did not come across to me in the "Roll" pages. I had the plugs inserted vertically. Next weekend, I will be connecting to the Server Mac and we'll see how things go. Thanks again.

12-29-2000, 11:37 PM
Yeahhhh Magician. Happy New Year to you and yours!

12-30-2000, 12:25 AM

it's always something.


thanks for the kind wishes--I am trying hard not to eat too much.

(As I contentedly sigh after a repast of lobster fettucine.)