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User Manual EE072 Humidity and Temperature Probe with Modbus RTU

INTEGER (read register):

Parameter

Unit

Scale

3)

Register number

1)

 [Dec] Register address

2) 

[HEX]

Read register: function code 0x03 / 0x04

Temperature T

°C

100

4002

0xFA1

Temperature T

°F

50

4003

0xFA2

Temperature T

°K

50

4005

0xFA4

Relative humidity RH, Uw

% RH

100

4011

0xFAA

Water vapour partial pressure e

mbar

10

4051

0xFD2

Water vapour partial pressure e

psi

1000

4052

0xFD3

Dew point temperature Td

°C

100

4053

0xFD4

Dew point temperature Td

°F

100

4054

0xFD5

Dew point temperature Td

°K

100

4074

0xFE9

Wet bulb temperature Tw 

°C

100

4055

0xFD6

Wet bulb temperature Tw

°F

100

4056

0xFD7

Wet bulb temperature Tw 

°K

100

4073

0xFE8

Absolute humidity dv 

g/m³

10

4057

0xFD8

Absolute humidity dv  

gr/ft³

10

4058

0xFD9

Mixing ratio r 

g/kg

10

4061

0xFDC

Mixing ratio r 

g/lb

10

4062

0xFDD

Specific enthalpy h 

kJ/kg

1

4063

0xFDE

Specific enthalpy h 

ft lbf/lb/kg

1

4064

0xFDF

Specific enthalpy h 

BTU/lb

1

4065

0xFE0

Frost point temperature Tf 

°C

100

4066

0xFE1

Frost point temperature Tf 

°F

100

4067

0xFE2

Frost point temperature Tf 

°K

100

4075

0xFEA

Ice bulb temperature Ti 

°C

100

4119

0x1016

Ice bulb temperature Ti 

°F

100

4120

0x1017

Ice bulb temperature Ti  

°K

50

4121

0x1018

1) Register number starts from 1 

2) Register address starts from 0 

3) Examples: For scale 100, the reading of 2550 means a value of 25.5. For scale 50, the reading of 2550 means a value of 51.

5.3  Modbus RTU Example

Example of MODBUS RTU command for reading the temperature (float value) T = 26,953624 °C 

from the register 0x3EA

• 

Device EE072; slave ID 234 [0xEA]

 

Reference document, chapter 6.3: 

www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf

•  See Application Note Modbus AN0103 (available on 

www.epluse.com/EE072

)

Modbus ID 

address

Function 

code

Starting 

address Hi

Starting 

address Lo

No. of 

register Hi

No. of 

register Lo

CRC

Request [Hex]:

EA

03

03

EA

00

02

F2

A0

Modbus ID 

address

Function 

code

Byte 

count

Register 1 

value Hi

Register 1 

value Lo

Register 2 

value Hi

Register 2 

value Lo

CRC

Response Hex]:

EA

03

04

A1

06

41

D7

12 CE

Decoding of floating point values:

Floating point values are stored according IEEE754 standard. The byte pairs 1, 2 and 3, 4 are inverted 

as follows:

MMMMMMMM

MMMMMMMM

SEEEEEEE

EMMMMMMM

Byte 3

Byte 4

Byte 1

Byte 2

Example:

Response [Hex]

Value in 

decimal

 Byte 1 (Register 2 - Hi) Byte 2 (Register 2 - Lo) Byte 3 (Register 1 - Hi) Byte 4 (Register 1 - Lo)

41

D7

A1

 06

26.953624

Summary of Contents for EE072

Page 1: ...BA_EE072_e V1 0 technical data are subject to change User Manual EE072 Humidity and Temperature Probe with Modbus RTU ...

Page 2: ... equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the in...

Page 3: ... Connectivity 6 4 Installation 6 4 1 Wall and Ceiling Mount 6 4 2 Duct Mount 7 4 3 Recommendations for accurate Humidity and Temperature Measurement 7 5 Modbus Map 7 5 1 Modbus Setup 7 5 2 Modbus Register Map 8 5 3 Modbus RTU Example 9 6 Maintenance and Service 10 6 1 Cleaning 10 6 2 Filter cap replacement 10 6 3 Protection during site cleaning operations 10 6 4 Repairs 11 6 5 Configuration Interf...

Page 4: ...Operation The EE072 Modbus RTU humidity and temperature probe has been produced under state of the art manufacturing conditions has been thoroughly tested and has left the factory fulfilling all safety crite ria The manufacturer has taken all precautions to ensure safe operation of the device The user must ensure that the device is set up and installed in a manner that does not have a negative eff...

Page 5: ...onfiguration adapter HA011018 E E Product Configuration Software Download www epluse com Configurator EE PCS Connection cable M12 flying leads 1 5 m 59 06 HA010819 5 m 196 85 HA010820 10 m 393 70 HA010821 T coupler M12 M12 HA030204 M12 cable connector for self assembly HA010707 Protection cap for the M12 cable socket HA010781 Protection cap for the M12 plug of EE072 HA010782 Protection cap for 12 ...

Page 6: ...D white 3 GND blue 4 A RS485 D black front view device plug front view 1 2 3 4 Tab 1 Connection diagram 4 Installation 4 1 Wall and Ceiling Mount Best measurement performance is achieved when the entire probe is located inside the environment to be monitored In such a case the EE072 may be for instance fixed onto a wall with the mounting clip HA010211 not included in the scope of supply see data s...

Page 7: ...natural ventilation which largely prevents overheating of the probe in the sun and thus a distortion of the measured values For highest accuracy of the measured humidity and the calculated parameters e g wet bulb tempera ture dew point and others the user can set the air pressure at the operating point using the EE PCS Product Configuration Software see 6 5 Configuration Interface or via Modbus Pr...

Page 8: ...s saved as a 32 bit floating point values data type FLOAT and as 16 bit signed integer values data type INTEGER FLOAT read register Parameter name Unit Register number1 Dec Register address2 HEX Read register function code 0x03 0x04 Temperature T C 1003 0x3EA Temperature T F 1005 0x3EC Temperature T K 1009 0x3F0 Relative humidity RH Uw RH 1021 0x3FC Water vapour partial pressure e mbar 1101 0x44C ...

Page 9: ...b temperature Ti C 100 4119 0x1016 Ice bulb temperature Ti F 100 4120 0x1017 Ice bulb temperature Ti K 50 4121 0x1018 1 Register number starts from 1 2 Register address starts from 0 3 Examples For scale 100 the reading of 2550 means a value of 25 5 For scale 50 the reading of 2550 means a value of 51 5 3 Modbus RTU Example Example of MODBUS RTU command for reading the temperature float value T 26...

Page 10: ...dusty or polluted environment it might be necessary to replace the filter cap once in a while In most of the cases a clogged filter shows visible contamination or dirt Longer response time of the humidity measurement also indicates a clogged filter cap In such cases replace the filter by a new original one see 2 2 Spare Parts Procedure Turn the filter cap counter clockwise for removing it Install ...

Page 11: ...vice 5 Click on the desired setup or adjustment mode from the main EE PCS menu on the left and follow the online instructions of the EE PCS PC HA011018 6 6 RH T Adjustment and Calibration Definition Adjustment the specimen is brought in line with the reference Calibration the specimen is compared with a reference and its deviation from the reference is documented Humidity calibration and adjustmen...

Page 12: ...tromagnetic compatibility EN 61326 1 2013 EN 61326 2 3 2013 Industrial Environment Working range 40 80 C 40 176 F 0 100 RH Storage conditions 40 80 C 40 176 F 0 90 RH non condensing Configuration and adjustment EE PCS Product Configuration Software free download and Modbus configuration adapater 1 Traceable to intern standards administrated by NIST PTB BEV The accuracy statement includes the uncer...

Page 13: ...ulin 69130 Ecully Tel 33 4 74 72 35 82 E mail info epluse fr E E Elektronik Germany Schöne Aussicht 8 C 61348 Bad Homburg Tel 49 6172 13881 0 E mail info epluse de E E Elektronik Italy Via Alghero 17 19 20128 Milano MI Tel 39 02 2707 86 36 E mail info epluse it E E Elektronik Korea Suite 2001 Heungdeok IT Valley Towerdong 13 Heungdeok 1 ro Giheung gu 16954 Yongin si Gyeonggi do Tel 82 31 732 6050 ...

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