Sentera Controls RSTHM-2 Mounting And Operating Instructions

Mounting and operating instructions

RSTHM-2

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ROOM TRANSMITTER

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Table of contents

SAFETY AND PRECAUTIONS 3

PRODUCT DESCRIPTION 4

ARTICLE CODES 4

INTENDED AREA OF USE 4

TECHNICAL DATA 4

STANDARDS 4

OPERATIONAL DIAGRAMS 5

MOUNTING & OPERATING INSTRUCTIONS IN STEPS 5

OPERATING INSTRUCTIONS 7

VERIFICATION OF INSTALLATION INSTRUCTIONS 8

MODBUS REGISTER MAPS 8

TRANSPORT AND STORAGE 10

WARRANTY AND RESTRICTIONS 10

MAINTENANCE 10

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SAFETY AND PRECAUTIONS

Read all the information, the datasheet, mounting and operating instructions and
study the wiring and connection diagram before working with the product. For
personal and equipment safety, and for optimum product performance, make sure you
entirely understand the contents before installing, using, or maintaining this product.

For safety and licensing (CE) reasons, unauthorised conversion and / or
modifications of the product are inadmissible.

e product should not be exposed to abnormal conditions, such as: extreme
temperatures, direct sunlight or vibrations. Long-term exposure to chemical
vapours in high concentration can affect the product performance. Make sure the
work environment is as dry as possible; avoid condensation.

All installations shall comply with local health and safety regulations and local
electrical standards and approved codes. is product can only be installed by an
engineer or a technician who has expert knowledge of the product and safety
precautions.

Avoid contacts with energised electrical parts; always treat the product as if it is
live. Always disconnect the power supply before connecting, servicing or repairing
the product.

Always verify that you apply appropriate power supply to the product and use
appropriate wire size and characteristics. Make sure that all the screws and nuts
are well tightened and fuses (if any) are fitted well.

Recycling of equipment and packaging should be taken into consideration and these
should be disposed of in accordance with local and national legislation/regulations.

In case there are any questions that are not answered, please contact your
technical support or consult a professional.

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PRODUCT DESCRIPTION

e RSTHM-2 series are combined room transmitters which measure
temperature, relative humidity and ambient light. ey are Power over
Modbus supplied and all the parameters are accessible via Modbus RTU.

ARTICLE CODES

Code Supply Connection

RSTHM-2 24 VDC, PoM RJ45

INTENDED AREA OF USE

■

Monitoring indoor temperature and relative humidity in HVAC applications

■

Suitable for residential and commercial buildings

■

For indoor use only

TECHNICAL DATA

■

Maximum power consumption: 0,0,312 W

■

Nominal power consumption in normal operation: 0,0,234 W

■

Imax: 13 mA

■

Selectable temperature range: 0—50 °C

■

Selectable relative humidity range: 5—85 %

■

Ambient light sensor with adjustable ‘active’ and ‘standby’ level

■

Bootloader for updating the firmware via Modbus RTU communication

■

3 LEDs for status indication

■

Accuracy: ±0,4 °C (0—50 °C); ±3 % rH (5—85 % rH), depending on the selected
parameter

■

Enclosure:

►

rear plate: plastic ABS, black (RAL 9004)

►

front cover: ASA, ivory (RAL 9010)

■

Protection standard: IP30 (according to EN 60529)

■

Operating ambient conditions:

►

temperature: 0—50 °C

►

rel. humidity: 5—85 % rH, (non-condensing)

■

Storage temperature: -10—60 °C

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STANDARDS

■

Low Voltage Direc tive 2014/35/EC; EN 60529:1991; EN 60730-1:2011

■

EMC Directive 2014/30/EC; EN 60730-1:2011, EN 61000-6-1:2007, EN 61000-6­3:2007, EN 61326-1:2013, EN 61326-2-3:2013

■

WEE E 2012/ 19/ E C

■

RoHs Directive 2011/65/EC

OPERATIONAL DIAGRAMS

10

20

30

40

50

60

70

80

90

100

Minimum

range

Minimum

alert

Maximum

alert

Input r egister 1

or 2 [%]

T [°C ] / rH [%] *

Maximum

range

Out of

range

Wit hin

range

Alert rangeAlert rangeOut of

range

* LED ind ications r efer to T (def ault) or rH, de pending on th e selected p arameter

MOUNTING & OPERATING INSTRUCTIONS IN STEPS

Before you start mounting the RSTHM-2 room transmitter, read carefully “Safety
and Precautions”. Choose a smooth surface for installation (a wall, panel and etc.).

Follow these steps:

1. Using a flat screwdriver, remove the front white cover by releasing the snap-fits

on its both sides (see Fig. 1 Snap-fits release).

2. Inser t the crimped RJ45 cable through the opening on the rear plate and plug it

into the socket (see Fig. 2 Mounting dimensions).

3. Using suitable fastening materials (not supplied), position the room sensor at

least 1,5 m from the floor. When planning the installation, allow enough clearance
for maintenance and service. Mount the sensor in a well-ventilated area. Mind
the correct mounting position and unit dimensions. See Fig. 2 and Fig. 3.

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Fig. 1 Snap-fits release Fig. 2 Mounting dimension Fig. 3 Mounting position

2x Ø 6

59,8

9,8

74,5

104,5

20

104,5

25,6

70,5

Correct Incorrect

Posit ion at min. 1,5 m

from the floor

4. Do the wiring according to the wiring diagram (see Fig.4).

Fig. 4 Wiring diagram

RJ45

1234567

8

24 VDC GND A /B

Supply voltage

24 VDC

Ground

Modbus RTU

communication,

signal A

Modbus RTU

communication,

signal /B

/B

A

GND

24 VDC

8 mm

8 mm

8 mm

8 mm

RJ45

1
2
3
4
5
6
7
8

1

2

3

4

5

6

7

8

5. Put back the cover and snap it in.

6. Switch on the mains supply.

5.

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Optional settings

If your unit is the first or the last unit on the Modbus RTU network (see Example 1 and
Example2), enable the NBT resistor via 3SModbus or Sensistant (Holding Register 30).

If your device is not an end device, leave the NBT disabled (default Modbus setting).

Example 1 Example 2

RX

ТX

NBT

NBT

NBT

Slave 2

Master

Slave n

Slave 1

Slave 2

Slave 1

RX

ТX

NBT

NBT

Master

Slave n

ATTENTION

t

Do not expose to direct sunlight!

OPERATING INSTRUCTIONS

Calibration procedure:

Both the relative humidity and temperature sensor elements are factory calibrated.
Recalibration is not necessary.

Bootloader

anks to the bootloader functionality, the sensor firmware can be updated via
Modbus RTU communication. To enter ‘Boot mode”, put a jumper onto pins 3 and
4 of the P1 header and restart the power supply (see Fig. 5). Once ‘Boot mode’ is
activated, the firmware can be updated via SM Boot application (par t of 3SModbus
software suite) or Sensistant.

Fig. 5 P1 header

123 45

Put a jumper onto pins 1 and 2
and wait for at least 5 se conds to
reset the Modbus communication

parameters

123 45

Put a jumper onto pins 3 and 4

and restart the supply to enter

bootloader mode

LED indications

1. When the green LED is on, the measured value (temperature or relative humidity)

is between the minimum and maximum alert range values (Fig 6 - 1).

2. When the yellow LED is on, the measured value (temperature or relative humidity)

is in the alert range (Fig 6 - 2).

3. When the red LED is on, the measured value (temperature or relative humidity)

is below the minimum measurement range value or above the maximum value.
Blinking red LED indicates loss of communication with a sensor (Fig 6 - 3).

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Fig. 6 LED indications

3

2

1

NOTE

By default, the LED indication refers to temperature measurements. is can be
changed to relative humidity values via Modbus Holding Register 26 (see Ta ble
Holding registers below).

Ambient light sensor

It measures the ambient light levels in order to activate or deactivate Input Register 6.
ere are two Holding Registers for setting Active or Standby light level in luxes.

■

If the measured light level is below the Standby level, Input Register 6 indicates “Standby”.

■

If the measured ambient light level is above the Active level, Input Register 6
indicates “Active”.

■

If the measured ambient light level is between the Active and Stand-by level, Input
Register 6 indicates “Low intensity”, therefore it is advisable to set Active and
Standby levels in Holding Registers 34 and 35 according to the ambient lighting.

VERIFICATION OF INSTALLATION INSTRUCTIONS

After switching on the power supply one of the LEDs light up according to the status
of the measured variable. If this is not the case, check the connections.

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MODBUS REGISTER MAPS

INPUT REGISTERS

Data type Description Data Values

1 Temperature reading signed int. Actual temperature level -300—700 500 = 50,0 °C

2 Relative humidity level unsigned int. Actual relative humidity level 0—1.000 1.000 = 100,0 % rH

3 Dew point signed int. Calculated dew point -700—700 200 = 20,0 °C

4 Reser ved, retu rns “0”.

5 Ambient light intensity unsigned int. Measured light intensity 0—32.000 1.000 = 1.000 lx

6 Acti ve / stan dby unsigned int.

Act ive or Standby indicat ion acco rding t he Act ive /
Standby light level defined via holding registers 34
and 35. If t he meas ured light leve l is bet ween the
two le vels th e indication is 0 ( Low intens ity)

0—2

0 =
1 =
2 =

Low light intensit y

Active

Standby

7—10 Reser ved, retu rn “0”.

11

Outp ut valu e 1
(temperature)

unsigned int. An alog output va lue for tempera ture (T ) 0—1.000

0 =

1.000 =

0 %

100 %

12

Output value 2 (relative
humidity)

unsigned int. Anal og outp ut value for rel ative h umidity (rH) 0—1.000

0 =

1.000 =

0 %

100 %

13 Reser ved, retu rns “0”.

14 Temperature alert flag unsigned int.

Flag i ndicate s that measu red tempe rature is o utside
set al ert va lues. Se t to ‘1’ when t he measu red value
is outside the temperature alert values defined by
holding registers 20 and 21.

0—1

0 =
1 =

Measured temperature is OK

Measured temperature is too high/ low

15 Relative humidity alert flag unsigned int.

Flag indicates that measured relative humidity
is out side se t alert v alues . Set to ‘1’ wh en the
measured value is outside the relative humidity alert
values defined by holding registers 22 and 23.

0—1

0 =
1 =

Measu red rH is OK

Measu red rH is t oo high/ l ow

16 Reser ved, return “0”.

17 Temperature range limit flag unsigned int.

Flag i ndicate s that measu red tempe rature is o utside
set range limit values. Set to ‘1’ when the m easured
value is outside the temperature range limit values
defined by holding registers 14 and 15.

0—1

0 =
1 =

Temperature range is OK

Tempera ture range is too high/ lo w

18

Relative humidity range
limit flag

unsigned int.

Flag i ndicates tha t measur ed rela tive humidit y is
outside set range limit values. Set to ‘1’ when the
measured value is outside the relative humidity limit
range values defined by holding registers 16 and 17.

0—1

0 =
1 =

rH ran ge is OK

rH ran ge is too hi gh/ low

19 Reser ved, returns “0”.

20

Humidity / temperature
sensor fault

unsigned int.

Flag i ndicates if th e commun ication wit h the
temperature and humidity sensor is lost.

0—1

0 =
1 =

No

Yes

21 Reserve d, retu rns “0”.

22 Ambi ent light senso r fault unsigned int.

Flag t hat shows if the c ommuni cation with t he
ambie nt ligh t sensor i s lost.

0—1

0 =
1 =

No

Yes

HOLDING REGISTERS

Data type Description Data Default Values

1 Device slave address unsigned int. Modbus device address 1—247 1 

2 Mod bus baud r ate unsigned int. Modbus communication baud rate 0—6 2

0 =
1 =
2 =
3 =
4 =
5 =
6 = 

4.800

9.60 0

19.2 00

38.400

57. 600

115. 200

230.400

3 Modbus parity mode unsigned int. Parity check mode 0—2 1

0 =
1 =
2 =

8N1

8E1
8O1

4 Device type unsigned int. Device typ e (Read only) RST HM-2 = 1094 

5 HW version unsigned int. Hardwar e version of t he device (Read only) XXXX 0x0100 = HW ve rsion 1.00

6 FW version unsigned int. Firmwa re version o f the devic e (Read only) XXXX 0x0100 = FW ve rsion 1.00

7—13 Reser ved, retu rn “0”.

14

Minimum temperature
range

unsigned int.

Minimum value of the temperature
range; canno t be set hi gher than max.
temperature range minus 5ºC

0 — (Max . range — 50) 0 100 = 10,0 °C

15

Maximum temperature
range

unsigned int.

Maximum value of temperature
range; canno t be set lo wer than min.
tempe rature rang e plus 5ºC

(Min . range + 50) – 500 500 500 = 50,0 °C

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HOLDING REGISTERS

16

Minimum relative
humidity range

unsigned int.

Minimum value of the rH range; cannot be
set hi gher tha n max. rH r ange minus 5 %

50 — (Ma x. range — 50) 50 2 00 = 20,0 % rH

17

Maximum relative
humidity range

unsigned int.

Maximum valu e of rH ran ge; cannot be se t
lower t han min. rH range p lus 5%

(Min . range + 50) – 850 850 850= 85,0 % rH

18—19 Reser ved, retu rn “0”.

20

Minimum temperature
alert

unsigned int. Minimum temperature alarm value

Min. temperature range — Max.
temperature alarm

0 10 0 = 10,0 ºC

21

Maximum
temperature alert

unsigned int. Maximum temperature alarm value

Min. temperature alarm — Max.
temperature range

500 5 00 = 50,0 ºC

22

Minimum relative
humidity alert

unsigned int. Minimum relative humidity alarm value

Min. relative humidity range —
Max. relative humidity alarm

50 200 = 20,0 % rH

23

Maximum relative
humidity alert

unsigned int. Maximum relative humidity alarm value.

Min. relative humidity alarm —
Max. relative humidity range

850 850 = 85,0 % r H

24—25 Reser ved, re turn “0 ”.

26 L ED indic ation unsigned int.

LED ind ication rela ted to on e of the
parameters

1—2 1

1 =
2 =

Temperature

rH

27—29 Reser ved, retu rn “0”.

30

Modbu s netw ork
resistor termination
(NBT )

unsigned int.

Sets device a s ending t he line o r not by
connecting NBT

0—1 0

0 =
1 =

NBT disconnected

NBT connected

31—33 Rese rved , return “0”.

34 Ac tive ligh t level unsigned int.

e ambi ent lig ht level a bove which
‘Acti ve’ is in dicated in inpu t regis ter 6

0—32.000 100 100 = 100 l x

35 Standby light level unsigned int.

e ambi ent lig ht level b elow which
‘Standby’ is indicated in input register 6

0—32.000 10 10 = 10 lx

36

Modbus registers
reset

unsigned int.

Rese ts Modbus Holdin g regis ters to
default values. When finished this register
is automatic ally rese t to ‘0’

0—1 0

0 =
1 =

Idle

Reset Modbus registers

37—4 0 R eser ved, re turn “0 ”

If you want to find o ut more a bout Mo dbus over serial l ine, ple ase visi t: http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf

TRANSPORT AND STORAGE

Avoid shocks and extreme conditions; stock in original packing.

WARRANTY AND RESTRICTIONS

Two years fr om the delivery date against de fects in manufactur ing. Any modificatio ns
or alterations to the product af ter the date of publication relieve the manufacturer
of any responsibilities. e manufacturer bears no responsibility for any misprints or
mistakes in this data.

MAINTENANCE

In normal conditions this product is maintenance-free. If soiled, clean with a dry or
damp cloth. In case of heavy pollution, clean with a non-aggressive product. In these
circumstances the unit should be disconnected from the supply. Pay attention that
no fluids enter the unit. Only reconnect it to the supply when it is completelydry.

RSTHM-2

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ROOM TRANSMITTER