elsner elektronik 30170 User manual

Temperature and humidity sensor TH-AP Modbus 1
Temperature and humidity sensor TH-AP Modbus • Version: 26.06.2023 • Technical changes and errors excepted. • Elsner Elektronik GmbH • Sohlengrund 16 • 75395 Ostelsheim • Germany • www.elsner-elektronik.de • Technical Service: +49 (0) 7033 / 30945-250
EN
TH-AP Modbus
Indoor and outdoor sensor
Technical specifications and installation instructions
1. Description
The Temperature and humidity sensor TH-AP Modbus measures temperature
and humidity in indoor and outdoor areas and calculates the dew point.
The devices are Modbus slaves with a RS485 interface and a RTU protocol. The
Modbus master, such as PC, SPS or MC can read the Temperature and humidity
sensor TH-AP Modbus measurement values with “Function 04h (Read Input Re-
gister)”.
Functions:
• Temperature measurement
• Humidity measurement
• Dewpoint calculation
Notes on dew point calculation:
The TH-AP Modbus calculates the dew point of the ambient air. This value can be
used for dew point monitoring. This would require another sensor for measuring
the surface temperature of the wall or pipe. Also, the dew point needs to be moni-
tored (compare with temperatures) in the Modbus master.
Monitoring predetermines the possible condensate build-up on the surface, giving
a chance for timely countermeasures.
1.0.1. Scope of delivery
• Sensor in on-wall housing
1.1. Technical specifications
The product conforms with the provisions of EU directives.
2. Installation and start-up
Installation, testing, operational start-up and troubleshooting should
only be performed by an authorised electrician.
CAUTION!
Live voltage!
• Inspect the device for damage before installation. Only put undamaged
devices into operation.
• Comply with the locally applicable directives, regulations and provisions for
electrical installation.
• Immediately take the device or system out of service and secure it against
unintentional switch-on if risk-free operation is no longer guaranteed.
Use the device exclusively for building automation and observe the operating inst-
ructions. Improper use, modifications to the device or failure to observe the opera-
ting instructions will invalidate any warranty or guarantee claims.
Operate the device only as a fixed-site installation, i.e. only in assembled condition
and after conclusion of all installation and operational start-up tasks, and only in the
surroundings designated for it.
Elsner Elektronik is not liable for any changes in norms and standards which may
occur after publication of these operating instructions.
2.1. Location
The sensor is designed for surface mounting. When selecting an installation loca-
tion, please ensure that the measurement results are affected as little as possible by
external influences. Possible sources of interference include:
• Direct sunlight
• Drafts from windows and doors
• Warming or cooling of the building structure on which the sensor is mounted,
e.g. due to sunlight, heating or cold water pipes
• Connection lines which lead from warmer or colder areas to the sensor
For outdoor installation it must be ensured that a 60 cm gap is left below the sensor
in order to prevent it from being snowed during snowfall.
The sensor must be mounted vertically. The measurement probe and the cable out-
let must point downwards.
2.2. Notes on mounting and commissioning
Do not open the temperature sensor if penetration of water (rain) is likely: Only a
couple of drops could damage the electronic.
Do not dip the measuring tip (metal sleeve with sensor) in water.
2.3. Mounting and connection
2.3.1. Device Design
ATTENTION!
Make sure the connection is correct!
• Connect the power supply to 1 and 2 only.
• Use the data connections A and B exclusively for Modbus.
2.4. Bus communication
2.4.1. Bus load
The RS485 transceiver used has 1/8 of a standard RS485 bus load (1/8 unit load) and
can manage at least a 2.4 V at 54 Ohm bus load. It can, thus, operate a bus with 32
nodes at standard bus load. If nodes with a lower load than the standard bus load
are connected to an RS485 bus, the bus can be operated with more nodes. If, for
example, only nodes with 1/8 bus load are connected, up to 32 x 8 = 256 nodes can
be connected to the bus.
Housing Plastic, Sensor sleeve metall
Color Grey
Assembly Surface mounting
Protection category Housing: IP65
Exterior sensor: IP43
Dimensions approx. 65 × 91 × 38 (W × H × D, mm)
Weight approx. 77 g
Ambient temperature Operation -40…+80°C, Storage -40…+85°C,
Operating voltage 24 V DC ±10%.
An appropriate power supply unit can be pur-
chased from Elsner Elektronik
Cable cross-section Massive conductors of up to 0,8 mm2
Current max. 15 mA
Interface RS485
Protocol RTU
RS485 bus load 1/8 unit load according to RS485 standard
RS485 driver perfor-
mance
min. 2.4 V at 54 Ohm bus load
(corresponds to 32 standard RS485 unit loads)
Measurement range
temperature
-40...+80°C
Measurement range
humidity
0% rH … 100% rH
Item number
30170
Fig. 1 Opened casing, board
1 Connecting plug, suitable for
massive
conductors of up to 0.8 mm²
1: 24 V DC (+)
2: GND (-)
Data line A: Modbus D0
Data line B: Modbus D1
The reference potential for data
lines is GND (-) of the power
supply.
2LEDs
„Green“: Power / operating vol-
tage.
„Red“: Error / sensor error or er-
roneous data.
„Yellow: Com / bus communica-
tion.
3 DIP switch for interface parame-
ters
(see detailed view)
4 DIP switch for slave address
(see detailed view)
5 Cable feed with screw joint
6 Sensor tip
1
2
3
4
5
6
Fig. 2 Rear view with dimensioning
of
openings for mounting

Temperature and humidity sensor TH-AP Modbus 2
Temperature and humidity sensor TH-AP Modbus • Version: 26.06.2023 • Technical changes and errors excepted. • Elsner Elektronik GmbH • Sohlengrund 16 • 75395 Ostelsheim • Germany • www.elsner-elektronik.de • Technical Service: +49 (0) 7033 / 30945-250
2.4.2. Setting up bus communication
If all DIP switches are in the OFF position (default setting), the following parameters
are active:
Address: 1
Baud rate: 19,200
Parity: Even
Termination: Disabled
Slave address:
The slave address is set with the help of the 8-bit DIP switch “Address”. If all swit-
ches are in the OFF position, Address 1 is active. Address 0 is reserved for broadcast
messages; addresses greater than 247 are not valid.
The coding of the address is binary. For the address 47, you must e.g. set the swit-
ches 1, 2, 3, 4 and 6 to ON.
Interface parameters:
1 stop bit is always used.
Further interface parameters are set with the help of the second 8-bit DIP switch.
Baud rate: If the first 4 switches are in the OFF position, the transfer rate amounts
to 19,200 bauds. If one of these switches is set to ON, the corresponding baud rate
is applicable.
Parity: If the two switches “ODD” and “NONE” are set to OFF, the parity is EVEN.
Only “ODD” or “NONE” activates the corresponding parity control.
EE MB: no function.
Term.: bus termination 124 ohms
2.4.3. Connection of the sensor
Remove the screw cover. Lead the cable for the connection through the cable feed
at the bottom of the housing and connect power supply 1 (+) / 2 (GND, -) and data
lines A (Modbus D0) / B (Modbus D1) to the respective terminals. The reference po-
tential for data lines is GND (-) of the power supply.
Replace the screw cover.
ATTENTION!
Make sure the connection is correct!
• Connect the power supply to 1 and 2 only.
• Use the data connections A and B exclusively for Modbus.
After the bus voltage has been applied, the device will enter an initialisation phase
lasting a few seconds. During this phase no information can be received or sent via
the bus.
3. Maintenance
Always isolate the device from the voltage supply for servicing and
cleaning.
The device must regularly be checked for dirt twice a year and cleaned if necessary.
In case of severe dirt, the sensor may not work properly anymore.
ATTENTION
The device can be damaged if significant volumes of water penetrate
the housing.
• Do not clean with high pressure cleaners or steam jets.
4. Transfer protocol
4.1. Temperature and humidity sensor TH-AP Modbus
4.1.1. Function 04H read input register TH-AP Modbus
Before the first measurement and in case of a faulty sensor, all registers are at
“-32768”.
4.1.2. Request string from master
Example request string for reading all data for slave address 1:
01H, 04H, 00H, 00H, 00H, 03H, B0H, 0BH
4.1.3. Output string from master TH-AP Modbus
Before the first measurement and in case of a faulty sensor, all registers are at
“-32768”.
5. Disposal
After use, the device must be disposed of in accordance with the legal regulations.
Do not dispose of it with the household waste!
Regis-
ter
Parameter Data type Data value Range
0 Temperature Signed
16Bit
-400 to +800 -40 to +80°C
1 Relative humidity Signed
16Bit
0 to 1000 0 to 100 %
2 Dew point tempera-
ture
Signed
16Bit
-400 to +800 -40 to +80°C
Fig. 3:
Detailed view DIP swit-
Byt
e
no.
Variable Explanation
0 Slave address xx
1 Command 04H Read input registers
2 Start address high
byte
xx Register start address
3 Start address low byte xx
4 Word count high byte xx Number of registers to be
read
5 Word count low byte xx
6 CRC low byte xx
7 CRC high byte xx
Byt
e
no.
Register
address
Variable Explanation
0 Slave address xx
1Command04
H
Read input register
2 Number of bytes xx Master requirement * 2
3 0 Temperature high
byte
xx with algebraic sign,
value/10 =
Temperature xx.x °C
4 Temperature low
byte
xx
5 1 Relative humidity
high byte
xx Value/10 = relative humi-
dity xx.x %
6 Relative humidity
low byte
xx
7 2 Dew point tempera-
ture high byte
xx with algebraic sign,
value/10 =
Dew point temperature
xx.x °C
8 Dew point tempera-
ture low byte
xx
9 CRC low byte xx
10 CRC high byte xx