Copyright HK Instruments 2021
www.hkinstruments.fi
Installation version 1.0 2021
1) Configuration of the output modes:
Select the output mode, current (4–20 mA) (optional) or voltage (0–10 V)
for each output (1-4) by installing jumpers as shown in Figure 4.
On a display version of the device, the output scale can be changed via the
configuration menu. An external configuration tool is available for devices
without user interface.
First, select the output mode by jumper, then select the output scale (4–
20 mA (optional) / 0–10 V / 2–10 V / 0–5 V) via the configuration menu.
Please see the user manual for more details.
The seller is obligated to provide a warranty of five years for the delivered goods
regarding material and manufacturing. The warranty period is considered to start
on the delivery date of the product. If a defect in raw materials or a production
flaw is found, the seller is obligated, when the product is sent to the seller without
delay or before expiration of the warranty, to amend the mistake at his/her dis-
cretion either by repairing the defective product or by delivering free of charge
to the buyer a new flawless product and sending it to the buyer. Delivery costs
for the repair under warranty will be paid by the buyer and the return costs by the
seller. The warranty does not comprise damages caused by accident, lightning,
flood or other natural phenomenon, normal wear and tear, improper or careless
handling, abnormal use, overloading, improper storage, incorrect care or recon-
struction, or changes and installation work not done by the seller. The selection
of materials for devices prone to corrosion is the buyer’s responsibility, unless
otherwise is legally agreed upon. Should the manufacturer alter the structure of
the device, the seller is not obligated to make comparable changes to devices
already purchased. Appealing for warranty requires that the buyer has correctly
fulfilled his/her duties arisen from the delivery and stated in the contract. The
seller will give a new warranty for goods that have been replaced or repaired
within the warranty, however only to the expiration of the original product’s war-
ranty time. The warranty includes the repair of a defective part or device, or if
needed, a new part or device, but not installation or exchange costs. Under no
circumstance is the seller liable for damages compensation for indirect damage.
Figure 4
STEP 4: Jumper settings
RECYCLING/DISPOSAL
The parts left over from installation should be re-
cycled according to your local instructions. Decom-
missioned devices should be taken to a recycling
site that specializes in electronic waste.
WARRANTY POLICY
Figure 3 - Jumper installation
A+
B–
24V
GND
GND
OUT1
OUT2
OUT3
OUT4
GND
OUT1
OUT2
OUT3
OUT4
3
1 2
4
OUT1
OUT2
OUT3
OUT4
V
mA
NOTE! When using mA output, do not use Vout scalings from the menu.
Using 2-10 V output in some applications it is critical to know immidiately if
the wire is broken or the device is damaged. In these cases, a 2-10 voltage
output is recommended.
2) Output range selection with CO2- and PM-models:
Install the jumper 1 (figure 3) to change output range. This feature is
intended to use only on devices without display. On a display version of
the device, the output range can be selected via the configuration menu.
Please see the user manual for more details.
Pin header
Description
Open
Connected
Open
Connected
CO2 / PM output range selection
400...2000 ppm (CO2 models)
0...2000 ppm (CO2 models)
0...500 μg/m3 (PM models)
0...50 μg/m3 (PM models)
1
3) Locking the display:
Install the jumper 2 (figure 3) to lock the display to prevent access to the con-
figuration menu after installation is completed.
4) Modbus termination:
Install a jumper 4 (figure 3) to terminate Modbus.
In order to avoid signal reflections, Modbus termination jumper must be
installed in case if the device is the last one of the bus.
Modbus registers
continued
Register
Parameter description
Data type
Min value
Max value
Range
4x0001
Offset CO2
16 bit
-200
200
-200..200 ppm
4x0002
Offset Humidity
16 bit
-100
100
-10.0..10.0 %
4x0003
Offset Celsius *1
16 bit
-50
50
-5.0..5.0 °C
4x0004
Offset Fahrenheit *1
16 bit
-90
90
-9.0..9.0 °F
4x0005
Offset TVOC ppm
16 bit
-300
300
-3.00..3.00 ppm
4x0006
Offset TVOC ug/m3
16 bit
-1000
1000
-1000..1000 ug/m3
4x0007
Offset CO2 EQ
16 bit
-200
200
-200..200 ppm
4x0008
Offset PM
16 bit
30
200
0.3..2.0 coefficient
4x0009
Backlight intensity
16 bit
0
100
0..100%
4x0010
Display Celsius *2
16 bit
0
6
Position number, 0=not used
4x0011
Display Fahrenheit *2
16 bit
0
6
Position number, 0=not used
4x0012
Display Humidity
16 bit
0
6
Position number, 0=not used
4x0013
Display CO2
16 bit
0
6
Position number, 0=not used
4x0014
Display CO2
EQ
16 bit
0
6
Position number, 0=not used
4x0015
Display PM2.5 hour
16 bit
0
6
Position number, 0=not used
4x0016
Display PM10 hour
16 bit
0
6
Position number, 0=not used
4x0017
Display IAQ
16 bit
0
6
Position number, 0=not used
Register
Parameter description
Data type
Min value
Max value
Range
3x0001
Program version
16 bit
1
9999
0.01..99.99
3x0002
CO2 reading
16 bit
0
2500
0..2500 ppm
3x0003
rH reading
16 bit
0
1000
0.0..100.0 %
3x0004
Temperature Celsius
16 bit
0
500
0.0..50.0 °C
3x0005
Temperature Fahrenheit
16 bit
320
1220
32.0..122.0 °F
3x0006
TVOC ppm reading
16 bit
0
3200
0.00..32.00 ppm
3x0007
TVOC ug/m3 reading
16 bit
0
10000
0..10000 ug/m3
3x0008
CO2_eq reading
16 bit
0
12000
0..12000 ppm
3x0009
IAQ reading TVOC
16 bit
1
5
1..5 IAQ index
3x0010
IAQ reading PM
16 bit
1
5
1..5 IAQ index
3x0011
3x0012
PM1 reading
16 bit
0
1000
0..1000 ug/m3
3x0013
PM2.5 reading
16 bit
0
1000
0..1000 ug/m3
3x0014
PM10 reading
16 bit
0
1000
0..1000 ug/m3
3x0015
PM2.5 1h average
16 bit
0
10000
0.0..1000.0 ug/m3
3x0016
PM2.5 24h average
16 bit
0
10000
0.0..1000.0 ug/m3
3x0017
PM10 1h average
16 bit
0
10000
0.0..1000.0 ug/m3
3x0018
PM10 24h average
16 bit
0
10000
0.0..1000.0 ug/m3
3x0019
3x0020
Error status
16 bit
0
65535
See table below
STEP 5: Modbus registers
Bit 0 temperature sensor detected,
0 = not detected, 1=detected
Bit 1 humidity sensor detected,
0 = not detected, 1=detected
Bit 2 co2 sensor detected,
0 = not detected, 1=detected
Bit 3 voc sensor detected,
0 = not detected, 1=detected
Bit 4 pm sensor detected,
0 = not detected, 1=detected
Bit 5 display module detected,
0 = not detected, 1=detected
Bit 6 current(mA) module detected,
0 = not detected, 1=detected
Bit 8 sensor warm up
0 = normal operation, 1 = warm up
Bit 9 rht status
0 = normal operation, >0 reading error
Bit 10 CO2 status
0 = normal operation, >0 reading error
Bit 11 pm status
0 = normal operation, >0 reading error
Bit 12 voc status
0 = normal operation, >0 reading error
3x0020 Error status bits
Function code 03 - Read holding registers, Function code 06 - Write single register,
Function code 16 - Write multiple registers, Broadcast supported with address 0
Function code 04 - Read input register
*1=Celsius and Fahrenheit limits are interdependent, and thus a change in one limit of a meas-
urement will also change the limits of the other measurement. Use Function code 06 (write single
register) for Celsius or Fahrenheit.
*2= Use Function code 16 (write multiple registers) for display configuration. Valid value (0 / 1...6)
needed for all display configuration registers. (see Siro User Guide STEP 1.1: Display view)
