Siemens RDF870MB Modbus Communicating Room Thermostat with Air Quality Monitorin


Operating Voltage AC 230V
Power Consumption 3 W, class II construction
Communication BACnet MS/TP
Digital output, switching current 3A
Analog outputs, number 2
Digital inputs, number 1
Relay outputs Fan: 1-,2- or 3-speed
Relay output, switching voltage 230 V
Triac outputs, number
Degree of protection
Dimensions (W x H x D)
102 x 120 x 29 mm
Color White


    • AC 230 V operating voltage, large, backlit display
    • Display and setpoint adjustment for PM2.5 (Particulate Matter) and CO2 (Carbon Dioxide) control
    • Display of room temperature, outside temperature, VOC (volatile organic compound) and RH (relative humidity)
    • Support 1-/3-/4-speed On/Off fan or ECM (DC) fan output
    • Two multifunctional inputs for external passive and DC 0-10 V sensors
    • Operating modes: Comfort, Economy and Protection
    • RS485 Modbus RTU slave mode
    • Modbus commissioning via third-party tool, e.g. Modbus scan, Modbus poll, etc
    • Mounting on recessed square 86 mm box or round 60 mm with 60 mm fixing centers and minimum 40 mm depth
    • Color of housing: Ivory white (RAL 9001)

    RDF870MB can be configured as a room unit via DIP switches.
    It provides the following additional functions:

    • Setpoint adjustment and display for room temperature, VOC, RH and display of outside temperature
    • Four remote digital outputs via bus and controlled by a master controller

    Application selectable:

    • PM2.5 control only
    • CO2 control only
    • PM2.5 & CO2 controls (CO2 higher priority in control)
    • Ventilation control

    Additional info

    2x sensor inputs are selectable:
    0: No function
    1: Temperature (AI) (NTC 10k)
    2: Temperature (AI) (0…10 V)
    3: PM2.5 (AI) μg/m3 (0…10 V)
    4: CO2 (AI) ppm (0…10 V)
    5: VOC (AI) % (0…10 V)
    6: VOC (AI) mg/m³ (0…10 V)
    7: RH (AI) % (0…10 V)
    8: Alarm input (DI)
    9: Dummy AI (0…10 V) (RU only)
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