AMR-OP75RHRC/01 control unit, temperature, humidity, CO2, touch graphic display, RS485, RTD/NTC, relay

Use cases

• Monitor indoor temperature, humidity, and CO2 levels on a live cloud dashboard for facility managers.
• Create an alert when CO2 concentration exceeds a threshold to trigger ventilation in classrooms or offices.
• Control the internal relay remotely to switch ventilation or signaling equipment from the cloud.
• Log RTD or NTC resistance values over time to detect sensor drift or calibration issues.
• Display outdoor temperature on the unit screen by writing the value from a remote weather source via the cloud.
• Track device status and firmware version across multiple installed units for maintenance planning.

Installation

1. 1Wire the AMIT AMR-OP75RHRC/01 RS485 A and B terminals to the corresponding RS485 port on your ModbusCloud gateway (MCG or MLP series), and connect the GND reference.
2. 2Configure the gateway serial port to 115200 baud, odd parity (1), and 8 data bits to match the device settings.
3. 3Set a unique Modbus RTU slave address on the AMR-OP75RHRC/01 and enter the same address in the ModbusCloud gateway configuration.
4. 4Import the AMIT AMR-OP75RHRC/01 template from the ModbusCloud template library and assign it to the correct gateway port and slave address.
5. 5Optionally configure a periodic write to register 100 every 30 seconds in the gateway to prevent the broken communication icon from appearing on the device display.
6. 6Verify that temperature, humidity, and CO2 readings appear correctly on the ModbusCloud dashboard before completing the installation.

Things to watch for

Registers (30)

16 read / 18 write

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