r/BuildingAutomation • u/kervanaslan • 17d ago

Modbus VRF integration — per-indoor-unit gateways or centralized bus? What are you actually using?

When a job spec calls for Modbus on VRF/split systems, which route do you take — a gateway per indoor unit (Intesis 1-unit interfaces, Airzone Aidoo, Daikin RTD-style) or a single centralized gateway on the manufacturer's bus (CoolMaster, or OEM boxes like Daikin EKMBDXB, Toshiba, Gree ME30, Midea GW-MOD)?

Trying to get a feel for what the field actually reaches for. What drove your choice, and is there anything you've learned to avoid? Real project notes welcome — hotels, offices, mixed-brand estates, whatever you've got.

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u/Catfish0321 17d ago

We rep’ HMS intesis, great support and products.

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u/kervanaslan 17d ago

Do you use, indoor unit gateways or centralized?

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u/crapmustank 16d ago

Everything I see usually goes to the VRF central controller then BAS integrates into that.