IN485DAI001R000 Daikin Sky VRV BACnet MS/TP Modbus RTU Gateway

IN485DAI001R000 connects Daikin Sky and VRV systems with BACnet MS/TP and Modbus RTU.

The IN485DAI001R000 communication gateway enables full bidirectional integration of Daikin Sky and VRV air conditioning systems with building automation installations using BACnet MS/TP or Modbus RTU. The device can operate as a BACnet MS/TP or Modbus RTU server gateway, making the same model suitable for BMS systems based on BACnet as well as automation installations using the Modbus RTU bus.

The IN485DAI001R000 is connected to the wired remote controller bus of the Daikin indoor unit, also referred to as P1P2 / RC bus, while the supervisory system side uses the EIA-485 port for BACnet MS/TP or Modbus RTU communication. This allows control and monitoring of air conditioning parameters such as operation mode, on/off status, temperature setpoint, fan speed, air direction, room temperature, alarms, errors, running hours counter and service signals, including filter maintenance functions.

IN485DAI001R000 – Daikin Sky and VRV integration topology with BMS
The gateway operates in the following structure: Daikin Sky or VRV indoor unit, P1P2 / RC bus, IN485DAI001R000 gateway and EIA-485 bus with BACnet MS/TP or Modbus RTU protocol. In practice, this means that an integrator can use one device model to connect Daikin air conditioning with a BMS, PLC, SCADA system or another supervisory automation system, depending on whether the project requires BACnet MS/TP or Modbus RTU.

Thanks to the built-in DIP switches, configuration is fast and does not require additional software. Key parameters such as BACnet MS/TP or Modbus RTU protocol selection, gateway role on the RC bus, baud rate, device address, temperature unit, EIA-485 termination and bus polarization are set directly on the device housing. In most installations, an external power supply is not required, as the gateway can be powered from the wired remote controller bus.

IN485DAI001R000 – BACnet MS/TP or Modbus RTU selection via DIP switch
The communication protocol is selected using DIP switch SW1-5. The default setting enables operation in BACnet MS/TP mode, while changing the switch position allows the gateway to operate as a Modbus RTU server. This is important in HVAC retrofit projects because the same interface can be used in buildings with a classic BACnet BMS as well as in industrial or building automation applications where air conditioning data is read via Modbus RTU.

Key features:

• Integration of Daikin Sky and VRV systems with building automation
• Support for two protocols: BACnet MS/TP and Modbus RTU
• Operation as a BACnet MS/TP or Modbus RTU server gateway
• BTL mark confirming BACnet interoperability
• Communication with the BMS side through the EIA-485 port
• Connection to the Daikin unit through the P1P2 / RC bus
• Configuration via built-in DIP switches – no additional software required
• BACnet MS/TP or Modbus RTU protocol selection via DIP switch SW1-5
• BACnet MAC address or Modbus server address configuration
• Built-in 120 Ω termination and configurable EIA-485 bus polarization
• Simultaneous control of the AC unit from the local controller and from the BMS via BACnet MS/TP or Modbus RTU
• Reading of internal variables, errors, alarms and running hours counters
• Support for filter maintenance functions
• Occupancy function supporting HVAC energy consumption optimization
• Mounting on DIN rail, wall or inside the indoor unit, depending on the AC model
• Compact dimensions: 93 x 53 x 58 mm

IN485DAI001R000 – BTL, BACnet Objects and Modbus RTU registers
In BACnet MS/TP mode, the Daikin unit functions are exposed as BACnet objects, which simplifies point mapping in BMS, SCADA and building controllers. In Modbus RTU mode, communication is handled through Modbus registers, enabling integration with industrial automation systems and PLC controllers. In both cases, the gateway allows control and monitoring of basic and service-related operating parameters of the air conditioning unit.

IN485DAI001R000 – EIA-485 practice for BACnet MS/TP and Modbus RTU
On the supervisory system side, the gateway uses an EIA-485 port with B, A and SG terminals. The EIA-485 bus should be wired in a linear topology, without star or loop connections. In BACnet MS/TP and Modbus RTU installations, it is important to verify correct A/B polarity, the SG reference according to the installation design, a common baud rate and a unique device address on the bus. If the gateway is located at the end of the line, the built-in 120 Ω termination can be activated using SW3.

Technical specification:

Supported air conditioning systems:

• Daikin Sky
• Daikin VRV
• Units compatible with the wired remote controller P1P2 / RC bus

Supported protocols:

• BACnet MS/TP
• Modbus RTU

Housing:

• Material: PC plastic, UL 94 V-0
• Dimensions: 93 x 53 x 58 mm (3.7 x 2.1 x 2.3”)
• Color: light grey RAL 7035
• Net weight: 85 g

Terminal wiring:

• Solid or stranded wires, twisted or with ferrule
• One core: 0.2–2.5 mm² (24–11 AWG)
• Two cores: 0.2–1.5 mm² (24–15 AWG)
• Three cores: not permitted

Power supply:

• In most cases, powered from the wired remote controller bus
• Optional external power supply: 12 VDC/AC, 0.1 A
• SELV-rated NEC class 2 or Limited Power Source (LPS) power supply

Mounting:

• DIN rail
• Wall
• Inside the indoor unit, depending on the AC model

Communication ports:

• EIA-485 port: BACnet MS/TP or Modbus RTU
• 1x EIA-485 pluggable terminal block: B, A, SG
• AC port: 1x RC bus pluggable terminal block, 2 poles
• RC bus / P1P2 without specific polarity
• Maximum RC bus length: 500 m
• Maximum EIA-485 bus length: 1200 m

DIP switches:

• SW1 – gateway role, BACnet MS/TP or Modbus RTU protocol selection and baud rate
• SW2 – BACnet MAC address or Modbus server address and temperature unit
• SW3 – 120 Ω termination and EIA-485 bus polarization

LED indicators:

• 2x communication status LED
• Indication of EIA-485 communication, AC communication, unit errors and normal operation

Environmental parameters:

• Operating temperature: 0–70°C (32–158°F)
• Storage temperature: -20–85°C (-4–185°F)
• Operating and storage humidity: 5–95% RH, non-condensing

Electrical isolation:

• Isolation between communication ports: 1000 VDC

Compliance and certificates:

• BTL mark for BACnet interoperability
• Designed for BACnet MS/TP and Modbus RTU building automation installations

Warranty: 36 months