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Reply to "MTH 30-1102 crossing gates and 2 MTH 45-1028 ITADs"

I have not seen published detailed schematics of ITADs. 

If two ITADs control a crossing gate, you have the situation where they conflict (one ITAD triggered, other ITAD not-triggered).   One ITAD would be driving the gate down, the other would be driving the gate up ...  Do not pass Go, Do not collect $200!

One solution is a relay triggered when either (or both) ITAD is triggered.  You then hook up the NO and NC outputs of this relay to the crossing gates(s).   Refer to this posting.

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