I never used the DZ-2500's to TMCC or Legacy. Z-stuff had the 2001A data wire drive. At one time there was a lot of discussion of having the switches chained together with the data wire driver and if one switch in the chain failed I thought all of them had to be programmed again. This was enough to stick to push button control at the control panel. It was quit intensive to wire but when a DZ-2500 or DZ-1000 fail all we have to do was wire in a new one. No programming . Things have evolved a lot further since then.
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