What cable specifications are recommended for different Pro 5000 applications?

Cable specifications vary by application: N-485 connections use Belden 9842 or equivalent up to 4000 feet; Wiegand card readers use 18 AWG 6-conductor shielded cable up to 500 feet; Indala readers with A-3/A-5 read heads use 18 AWG 12-conductor shielded cable up to 75 feet; relay outputs use 18 AWG twisted pair shielded cable up to 2000 feet. All cable shields should connect to the copper grounding stud on the enclosure.

From the official Honeywell Pro 5000 Thermostat manual, page 21

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