IN485HIT001R000 – Hitachi to BACnet MS/TP Gateway for VRF AC Systems

IN485HIT001R000 is a BACnet MS/TP gateway enabling full bi-directional integration of Hitachi VRF AC units with BACnet networks. 

The IN485HIT001R000 gateway allows seamless communication between Hitachi indoor air conditioning units and building automation systems via the BACnet MS/TP protocol. By wiring the gateway directly to the indoor unit, users can control essential parameters such as operating mode, fan speed, temperature setpoint, and more. Furthermore, the gateway supports real-time monitoring of unit status, error codes, alarms, and internal variables.

Installation is straightforward and does not require any additional software or external power supply. DIP switches on the device allow for rapid configuration of network settings and addressing. Its compact dimensions and flexible mounting options make it ideal for integration in diverse HVAC environments – whether mounted on a DIN rail, wall, or within the AC unit itself.

Features:

• Certified BTL mark for seamless BACnet MS/TP interoperability
• Supports only BACnet MS/TP protocol
• No software required – configuration via onboard DIP switches
• Plug-and-play setup with quick DIP-SW configuration
• Power supplied through the AC unit – no external PSU needed
• Allows simultaneous control via manufacturer IR remote and BACnet
• Compact size: 93 x 53 x 58 mm
• Flexible mounting: DIN rail, wall or inside selected Hitachi indoor units
• Fixed BACnet objects structure for consistent BMS integration
• Occupancy mode enables HVAC energy savings during idle periods
• Full access to internal AC unit data, including operating hours, fault reporting, and system health

Specifications:

Enclosure:

• Material: Plastic, type PC (UL 94 V-0)
• Dimensions (DxWxH): 93 x 53 x 58 mm / 3.7 x 2.1 x 2.3”
• Color: Light grey (RAL 7035)

Terminal wiring for low-voltage signals:

• Solid or stranded wires (twisted or with ferrule)
• 1 core: 0.5 to 2.5 mm² (24 to 11 AWG)
• 2 cores: 0.5 to 1.5 mm² (24 to 15 AWG)
• 3 cores: not allowed

Mounting:

• DIN rail, wall, or internal installation in select Hitachi indoor AC units

BACnet MS/TP port:

• 1 x EIA-485 pluggable terminal block (3 poles: B, A, SG) with 120 Ω termination and DIP-switch-configurable polarization

AC unit port:

• 1 x RC bus pluggable terminal block (2 poles: A, B)

LED indicators:

• 2 x Communication status LEDs

DIP switches:

• SW1: Gateway and baud rate configuration
• SW2: MAC address and temperature unit setting
• SW3: Bus termination and polarization

Environmental conditions:

• Operating temperature: 0 to +70°C / 32 to 158°F
• Storage temperature: -20 to 85°C / -4 to 185°F
• Humidity: 5% to 95%, non-condensing

Electrical characteristics:

• Isolation voltage: 1500 VDC
• Insulation resistance: 1000 MΩ

Certifications & Standards:

• BACnet certified
• CE compliant (EMC 2014/30/EC, Low Voltage 2014/35/EC)
• Standards: EN 61000-6-3, EN 61000-6-2, EN 62368-1
• RoHS 2 compliant (Directive 2011/65/EU)

Warranty: 36 months