E+E Elektronik EE800 - CO2, Temperature and Humidity Room Sensor

Installation

1. 1Mount the E+E Elektronik EE800 on the wall in the monitored room according to the manufacturer's installation guide.
2. 2Connect the RS-485 A and B data lines and the power supply wires from the EE800 to the ModbusCloud gateway (MCG or MLP series).
3. 3Set the Modbus slave address on the EE800 using its DIP switches or configuration tool, and ensure it does not conflict with other devices on the bus.
4. 4Verify that the gateway serial port is configured for 9600 baud, 8 data bits, even parity (1) and 1 stop bit, matching the EE800 defaults.
5. 5Import the E+E Elektronik EE800 template in the ModbusCloud platform and assign the correct slave address.
6. 6Confirm that CO2, temperature, humidity and dew point readings appear on the dashboard before closing the installation.

Things to watch for

01

I see no data from the EE800 after connecting it. What should I check?

Verify the RS-485 wiring polarity (A and B lines) and confirm that the baud rate is set to 9600 with even parity on both the sensor and the gateway. Also check that the configured slave address matches the address set on the EE800.

02

The temperature or humidity values look incorrect or extremely large. Why?

All registers on the EE800 are float32 (two consecutive 16-bit registers). Make sure the byte order and word order in the gateway match the sensor's format. An incorrect word swap will produce nonsensical values.

03

Can I connect multiple EE800 sensors to one gateway?

Yes. Assign a unique Modbus slave address to each EE800 and add a separate template instance for each sensor in ModbusCloud. Keep the total RS-485 bus length and device count within specification.

04

Do I need to enable Modbus on the EE800 before it responds?

The EE800 typically ships with Modbus RTU enabled by default. If the sensor does not respond, consult the E+E Elektronik data sheet to confirm that the Modbus output option is installed and active on your specific model variant.

Registers (4)

4 read / 0 write

More E+E Elektronik templates

E+E Elektronik EE260 - Heated Humidity and Temperature Probe for Meteorology

E+E Elektronik

Modbus RTU

Measures heated humidity and temperature for meteorology applications

4 registers31

E+E Elektronik EE072 - Humidity and Temperature Probe with Digital Interface

E+E Elektronik

Modbus RTU

Measures relative humidity, temperature, and derived humidity parameters for process control.

5 registers26

E+E Elektronik EE600 - Differential Pressure Sensor

E+E Elektronik

Modbus RTU

Measures differential air pressure for HVAC and filter monitoring applications.

1 registers21

E+E Elektronik EE671 - HVAC Miniature Air Flow Probe

E+E Elektronik

Modbus RTU

Measures air velocity and temperature for HVAC applications.

2 registers20

EE

E+E Elektronik EE310 - High-end humidity and temperature sensor up to 180 °C

E+E Elektronik

Modbus RTU

Measures humidity and temperature for demanding industrial environments up to 180 °C

5 registers10

E+E Elektronik EE650 - Air Flow Sensor for HVAC

E+E Elektronik

Modbus TCP

Measures air flow velocity and temperature for HVAC applications.

2 registers9

More RTU templates

Alnor HRU-P

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls Alnor HRU-P heat recovery ventilation units via Modbus RTU.

49 registers7

Alnor HRU

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls and monitors Alnor heat recovery ventilation units via Modbus RTU.

29 registers13

Wattsonic - Schmachtl Sun Energy Box

Wattsonic

Modbus RTU

Monitors Schmachtl Wattsonic hybrid inverter via Modbus RTU

92 registers72

Heidelberg Wallbox Energy Control

AMPERFIED GmbH

Modbus RTU

Controls and monitors Heidelberg Wallbox Energy Control EV charger via Modbus RTU.

22 registers67

connecdoor.controller

connecdoor

Modbus RTU

Controls and monitors smart door access points via RS485

0 registers53

Eastron SDM72D-M

Eastron

Modbus RTU

Reads energy metering values from an Eastron SDM72D-M three-phase meter.

15 registers149