Quick Guide EE850

CO2, Humidity and Temperature Duct Sensor

Please Note

Find this document and further product information on our website at www.epluse.com/ee850.

Electrical Connection

[Warning] Incorrect installation, wiring or power supply may cause overheating and result in personal injury or property damage. Cables must not be under voltage during electrical installation and connection or disconnection, especially at terminal connections on circuit boards. For correct cabling, always observe the presented wiring diagram for the product version used. The manufacturer cannot be held responsible for personal injury or damage to property caused by incorrect handling, installation, wiring, power supply or maintenance of the device.

Hardware

The bus termination shall be realized with a 120 Ω resistor (slide switch on the board).

NOTICE: For proper function, the power supply must be strong enough to ensure supply voltage within the specified range (see technical data) at any time and at all devices in the bus. This is particularly relevant when using long and thin cables which can cause high voltage drop. Please note that a single digital EE850 requires peak current of 150 mA.

Wiring

Digital Interface

Power Supply: 24 V AC/DC ±20% / 15-35 V DC

Supply and RS485 Interface Connections:

Pin 1: V+
Pin 2: GND
Pin 3: RS485 A (=D+)
Pin 4: RS485 B (=D-)

A 120 Ohm termination resistor is available via a slide switch (ON/OFF) on the board.

Address Setting

Address Switch

The EE850 uses an 8-position DIP switch for address configuration.

Example DIP switch settings:

All switches OFF (00000000)
Example setting: 11010000

Options

Address setting via PCS10 Product Configuration Software (= factory setting)

All DIP switches at position 0: Address must be set via PCS10.
Modbus (slave device): Factory setting is 67 (permitted values: 1...247).
BACnet (master device): Factory setting is 67 (permitted values: 0...127).

Address setting via DIP switches

Modbus (slave device): Setting DIP switches to any address other than 0 overrides the Modbus address set via PCS10 (permitted values: 1...247).
BACnet (master device): Setting DIP switches to any address other than 0 overrides the BACnet address set via configuration software.
BACnet Note: Permitted values are 0...127. The 8th bit of the DIP switches is ignored (ID 127 = 0111 111BIN). To set address 0 via DIP switches, the 8th bit shall be set to 1 (ID 0 = 1000 0000BIN). Example: Address set to 11 DEC (00001011BIN).

BACnet Setup

The EE850 PICS (Product Implementation Conformance Statement) is available on the E+E website at www.epluse.com/ee850.

EE850 BACnet factory settings: Address 67 (0x43), Baud rate as ordered via order code, 8 data bits, parity none, 1 stop bit.

Modbus Setup

The measured values are saved as a 32-bit float value and a 16-bit signed integer.

EE850 Modbus factory settings: Address 67 (0x43), Baud rate as ordered via order code, 8 data bits, parity even, 1 stop bit.

This Modbus address can be changed by the user in register 1 (0x00) with function code 0x06. Permitted values are 1...247.

The serial number as ASCII-code is located at read register addresses 1-8 (0x00 - 0x07) and function code 0x03 or 0x04.

The firmware version is located at register address 9 (0x08) and function code 0x03 or 0x04 (bit 15...8 = major release; bit 7...0 = minor release).

Data Registers

FLOAT32 Parameters

Parameter	Unit	Register number¹⁾ [DEC]	Register address²⁾ [HEX]
Read register: function code 0x03/0x04
Temperature	°C	1003	3EA
	°F	1005	3EC
Relative humidity	%	1021	3FC
CO₂ (average)	ppm	1061	424
CO₂ (raw)	ppm	1063	426
Water vapour partial pressure	mbar	1101	44C
	psi	1103	44E
Dew point temperature	°C	1105	450
	°F	1107	452
Absolute humidity	g/m³	1113	458
	gr/ft³	1115	45A
Mixing ratio	g/kg	1121	460
	gr/lb	1123	462
Specific enthalpy	kJ/kg	1125	464
	ft lb/lb	1127	466
	BTU/lb	1129	468
Frost point temperature	°C	1131	46A
	°F	1133	46C

INT16 Parameters

Parameter	Unit	Scale³⁾	Register number¹⁾ [DEC]	Register address²⁾ [HEX]
Read register: function code 0x03/0x04
Temperature	°C	100	100	4002 (FA1)
	°F	50	50	4003 (FA2)
Relative humidity	%	100	1021	4011 (FAA)
CO₂ (average)	ppm	1	1061	4031 (FBE)
CO₂ (raw)	ppm	1	1063	4032 (FBF)
Water vapour partial pressure	mbar	10	1101	4051 (FD2)
	psi	1000	1103	4052 (FD3)
Dew point temperature	°C	100	1105	4053 (FD4)
	°F	100	1107	4054 (FD5)
Absolute humidity	g/m³	10	1113	4057 (FD8)
	gr/ft³	10	1115	4058 (FD9)
Mixing ratio	g/kg	10	1121	4061 (FDC)
	gr/lb	10	1123	4062 (FDD)
Specific enthalpy	kJ/kg	1	1125	4063 (FDE)
	ft lb/lb	1	1127	4064 (FDF)
	BTU/lb	1	1129	4065 (FE0)
Frost point temperature	°C	100	1131	4066 (FE1)
	°F	100	1133	4067 (FE2)

¹⁾ Register number (decimal) starts from 1.

²⁾ Register address (hexadecimal) starts from 0.

³⁾ Examples for factory scaling of stored value:

100 is the scale 1:100 (e.g., 2550 is equivalent to 25.5 °C)
50 is the scale 1:50 (e.g., 2550 is equivalent to 51 °F)
10 is the scale 1:10 (e.g., 135 is equivalent to 13.5 mbar)
1 is the scale 1:1 (e.g., 800 is equivalent to 800 ppm)

Communication settings (INT16)

Parameter	Register number¹⁾ [DEC]	Register address²⁾ [HEX]
Write register: function code 0x06
Modbus address³⁾⁴⁾	1	00
Modbus protocol settings⁴⁾	2	01

Parameter	Register number¹⁾ [DEC]	Register address²⁾ [HEX]
Read register: function code 0x03/0x04
Serial number (as ASCII)	1	00
Firmware version	9	08
Sensor name (as ASCII)	10	09

¹⁾ Register number (decimal) starts from 1.

²⁾ Register address (hexadecimal) starts from 0.

³⁾ If the Modbus address is set via DIP switch, the response will be NAK.

⁴⁾ For Modbus address and protocol settings, see Application Note Modbus AN0103 (available at www.epluse.com/ee850).

Modbus RTU Example

Request [Hex]:

Modbus address	Function code	Starting address Hi	Starting address Lo	Qty. of registers Hi	Qty. of registers Lo	CRC
43	03	04	24	00	02	8A 12

Response [Hex]:

Modbus address	Function code	Byte count	Register 1 value Hi	Register 1 value Lo	Register 2 value Hi	Register 2 value Lo	CRC
43	03	04	0B	00	44	A1	68 AB

Modbus response [Hex]

Data representation according to IEEE754

	Byte 1	Byte 2
Register 1 (Hi)	0B	0000 1011
Register 1 (Lo)	00	0000 0000
Register 2 (Hi)	44	0100 0100
Register 2 (Lo)	A1	1010 0001

Decimal value: 1288.34375

E+E Elektronik

E+E Elektronik Ges.m.b.H.

Langwiesen 7
4209 Engerwitzdorf | Austria

T +43 7235 605-0
F +43 7235 605-8

info@epluse.com
www.epluse.com

[CE Mark] [UKCA Mark] [Canada Mark]

	EE850 Duct Mount Sensor User Manual: CO2, Humidity, and Temperature Measurement User manual for the E+E Elektronik EE850 duct mount sensor, providing detailed information on its features, installation, setup, digital settings (Modbus, BACnet), technical specifications, and troubleshooting for CO2, humidity, and temperature measurement.
	E+E Omniport 40 Multifunction Portable Measuring Device Datasheet Datasheet for the E+E Omniport 40, a versatile portable measuring device for various parameters including temperature, humidity, oil humidity, volumetric flow, dew point, and CO2. Features exceptional measurement performance, robust design, and user-friendly interface.
	EE210 Humidity and Temperature Sensor User Guide \| E+E Elektronik Comprehensive user guide for the E+E Elektronik EE210 Humidity and Temperature Sensor. Covers installation, configuration, technical specifications, Modbus communication, maintenance, and troubleshooting for demanding climate control applications.
	EE220 Humidity and Temperature Sensor User Manual User manual for the E+E Elektronik EE220 Humidity and Temperature Sensor, detailing installation, operation, adjustment, technical specifications, and spare parts. This document provides comprehensive guidance for the proper use and maintenance of the EE220 sensor.
	EE650 Air Velocity Sensor with RS485 Interface Quick Guide A quick guide detailing the installation, wiring, configuration, and technical specifications for the E+E Elektronik EE650 Air Velocity Sensor with RS485 and Analogue Output interfaces. Covers Modbus and BACnet communication settings, address configuration, and jumper settings for various parameters.
	E+E Elektronik EE871 CO2 Sensing Probe User Guide Explore the E+E Elektronik EE871 CO2 Sensing Probe, a robust NDIR sensor for demanding applications. This guide details its features, technical specifications, operation, and accessories for accurate CO2 measurement in various environments.
	E+E Sigma 05 Datasheet: Modular Sensor Platform Datasheet for the E+E Sigma 05 modular sensor platform, detailing its features, specifications, and accessories. The Sigma 05 supports up to three plug-and-play probes and offers analog outputs and an optional display.
	Accurate Sensors for Industrial Drying \| E+E Elektronik Discover E+E Elektronik's advanced sensor solutions for precise and efficient industrial drying processes, covering building materials, textiles, agriculture, and food. Learn about smart sensor protection and calibration services.