INMBSSAM001R000 Samsung VRF to Modbus RTU RS-485 gateway for BMS with full bidirectional control

Samsung Commercial and VRF air conditioners communication module for Modbus RTU (RS-485).

INMBSSAM001R000 is a communication gateway that connects Samsung Commercial and VRF air conditioning systems to building automation, BMS, or PLC environments using Modbus RTU (RS-485 / EIA485). Instead of keeping HVAC control isolated within proprietary user interfaces, the gateway exposes key control points, operating states, and diagnostic information as Modbus registers—making integration predictable, repeatable, and easier to standardize across multi-zone projects.

IntesisBox INMBSSAM001R000 enables full bi-directional monitoring and control of all operating parameters of Samsung Commercial and VRF air conditioners from a Modbus RTU (RS-485) network.

Bi-directional operation is essential in real deployments: the supervisory system can send commands and read back real-time feedback and confirmations. The gateway supports control of main AC functions (such as operating mode, fan speed, and temperature setpoint) while also enabling monitoring of errors, alarms, and selected internal variables. This supports service workflows and preventive supervision—events can be detected and reported earlier, improving response time and reducing downtime in commercial HVAC installations.

The module is wired directly to the indoor unit, providing stable access to operational data and control in VRF environments where system scale and zone dependencies are higher than in basic split setups. On the Modbus side, the device works as a Modbus Slave, allowing straightforward integration into standard RS-485 architectures alongside other Modbus field devices.

Commissioning is designed to be fast: connect the gateway, set the required DIP-SW options, and the unit is ready—no configuration software and no external power supply are required. A consistent Modbus register mapping approach (used across AC brands) helps reduce engineering effort and makes it easier to replicate the same integration concept across multiple buildings or project phases.

In commercial buildings, user ergonomics matters too. INMBSSAM001R000 allows simultaneous use of IR and wired controllers as well as Modbus RTU. This enables the BMS to apply schedules and energy rules while local users still retain familiar room-level control when needed.

• Reduced dimensions
• Fast and easy installation
• No external power supply required
• Direct connection to MODBUS RTU (RS-485). Up to 63 SM-RC-MBS-1 devices can be connected to the same network
• SM-RC-MBS-1 is a Modbus Slave device
• Direct connection to the AC indoor unit
• Configuration via built-in DIP switches and through MODBUS RTU
• Total control and supervision
• Real-time status of internal variables of the AC unit
• Allows simultaneous use of IR and wired controllers and MODBUS RTU

• Dimensions: 93 x 53 x 58 mm
• Weight: 85 g
• Mounting:
  • Wall mounting
  • DIN rail EN60715 TH35
• Modbus port: 1 x EIA485 compatible with Modbus RTU
• LEDs: 2 x IntesisBox activity (Tx, Rx)
• Operating temperature: 0°C to 70°C
• Storage temperature: -40°C to 85°C
• Operating humidity: 5% to 95%, non-condensing
• Storage humidity: 5% to 95%, non-condensing
• Isolation voltage: 1500 VDC
• Isolation resistance: 1000 MQ
• Protection rating: IP20 (IEC60529)

With 1500 VDC isolation, the gateway helps improve robustness in RS-485 installations where electrical noise, grounding differences, or long cable runs may be present. Wall or DIN rail mounting makes it suitable for both automation panels and technical rooms close to the HVAC equipment.

Manufacturer warranty: 36 months

Product code: INMBSSAM001R000