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Cannot find AIUs

I have 2 TIUs (a Rev G and a Rev L), 2 AUIs, and 2 TUI/AIU interface cables. I've successfully had the G and one of the AUIs work in the past. The other AUI is one I bought maybe 5 years ago, but never used.

Both TIUs are set to Address 1 (1 blink, verified), but powered only one TIU at a time. For each TIU, I tried both AIUs and both cables in all possible combinations. The cable is always connected to the TIU at the AIU INPUT port and to the AUI at the TIU INPUT port, per Barry's book. The TIUs had nothing other than AUX power connected to them. When I hit READ, I always find TIU1 as expected) but no AIUs. What am I doing wrong? I'm having a very hard time believing that both TIUs, both cables, and both AUIs are bad.

Chris

LVHR

Original Post

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