INTESIS INMBSSAM001R100 Samsung NASA unit at Modbus RTU interface - 1 unit

The INTESIS INMBSSAM001R100 gateway is designed to provide full bidirectional communication between Samsung NASA air conditioning units and the Modbus RTU network. This device allows Samsung air conditioning systems to be fully integrated with control and supervision systems based on Modbus RTU.

Key Features

The gateway connects directly to the Samsung remote controller bus (F3F4 connector) and includes plug-in terminal blocks to establish the connection with the indoor air conditioning unit and the Modbus RTU EIA-485 network.

Connections and Communication

The device implements a Modbus RTU (Slave) interface that can be connected to an EIA-485 line. It supports different baud rates (2400 bps, 4800 bps, 9600 bps - default -, 19200 bps, 38400 bps, 57600 bps, 76800 bps, and 115200 bps) and can perform 8N2 (8 data bits, no parity and 2 stop bits) or 8N1 (8 data bits, no parity and 1 stop bit) communications. The gateway automatically detects the type of communication (8N2 or 8N1) and configures itself accordingly.

Modbus logs

All registers are of the “16-bit unsigned Holding Register” type and use Modbus's big endian notation. The logs can be read (Modbus functions 3 or 4) or written (Modbus functions 6 or 16), allowing detailed control and supervision of the internal variables of the air conditioning unit.

Examples of Registers

• Real temperature setpoint (logs 23 and 24): provides the current setpoint temperature used by the air conditioning unit.
• Return path temperature (registers 66 and 67): provides the temperature detected by the return path sensor.

Configuration and Indicators

The gateway can be configured through the Modbus interface or using the onboard DIP switches (SW1, SW3 and SW4). The device includes two LED indicators to display operating states, such as connection to the network and operating status.

LED Indicators

• L1 (green LED): indicates the operating status and the connection to the network.

The INTESIS INMBSSAM001R100 gateway allows the installation of up to 63 Intesis devices on the same Modbus RTU network, although the use of Modbus repeaters may be necessary depending on the configuration speed.