Operating manual
Transmitters / regulators
HD45 – HD46
www.deltaohm.com
Companies / Brands of GHM
English
Keep for future reference.
HD45 / HD46 - 2 - V2.4
1. INTRODUCTION
The instruments of the HD45 and HD46 series are transmitters, indicators and
regulators suitable for measuring and monitoring the following environmental
parameters, depending on the model:
• Relative humidity (RH)
• Ambient temperature (T)
• Carbon dioxide (CO
2
)
• Dewpoint Temperature (DP, computed value)
These instruments are designed for ambient air monitoring. Typical applications are
air quality analysis in crowded buildings (such as schools, hospitals, auditoriums,
work sites, refectories etc). This analysis allows to adjust air conditioning systems
(temperature and humidity) and ventilation (air changing/hour) in order to achieve a
double target: obtain a good air quality in compliance with the ASHRAE and IMC
directives in force and save energy.
RH (Relative Humidity) measurement is obtained by means of a capacitive sensor.
The sensor is temperature compensated to assure accurate and reliable
measurements with the time. In HD46 models, relative humidity and temperature
sensors with their calibration data are contained in an easy-to-replace module.
The temperature T is measured by means of a high-accuracy NTC sensor.
CO
2
(Carbon Dioxide) measurement is obtained by use of a special infrared sensor
(NDIR technology: Non-Dispersive Infrared Technology) that ensures long-lasting,
accurate and stable measures, thanks to the use of a double filter and a special
measurement technique. The presence of a protection membrane, through which
sampled air flows, protects the sensor from dust and atmospheric agents.
The instruments are factory calibrated and require no further adjustment by the
installer.
The instrument is wall-mounted and sensors are built-in.
0÷10V voltage or 4÷20mA current analog output versions are available, along
with PC-connectable versions via RS485 serial port with MODBUS-RTU protocol,
allowing connection with multiple transmitters on the same network.
Relay-equipped versions allow direct monitoring of measured ambient parameters
when user-custom thresholds are exceeded. Monitoring activation is shown by LED
indicators (in HD46…R models only). The relays operation is very versatile: they are
provided with an activation mode when threshold limits (lower/upper limit) are
exceeded, and in single or double threshold mode. Thresholds are user-configurable
over the whole range.
The LCD display option allows immediate viewing of all instrument-detected
measures.
The models HD45 BVR and HD45 BAR are distinguished by the ability to indicate an
immediate level of air quality, through turning on of the LED indicators associated
with graphic symbols.
All instrument functions can be set up in a quick and intuitive way through connection
to a PC.
HD45 / HD46 - 3 - V2.4
HD46 series models can be provided with a keyboard that allows easy instrument
setup even if not connected to a PC. Models provided with keyboard have a display
with backlight that can be enabled by a simple key pressure.
Models of the series HD45 provided with relay have a hardware switch that allows
quick selection of the threshold between a set of preset values.
All models perform continuous measure storing and data can be downloaded on a PC.
Instruments are powered with 24Vac or 15…35Vdc supply.
HD45 / HD46 - 4 - V2.4
1.1 Instruments versions available
Serie HD45
Model UR T CO2
Analog
output
RS485
output
Relay
output
LCD Keys LED
HD45 17V
√ √
√ (2)
Power
HD45 17A
√ √
√ (2)
Power
HD45 17S
√ √
√
Power
HD45 17R
√ √
√ (1)
Power
HD45 17SR
√ √
√ √ (1)
Power
HD45 17VR
√ √
√ (2)
√ (1)
Power
HD45 17AR
√ √
√ (2)
√ (1)
Power
HD45 17DV
√ √
√ (2)
√
Power
HD45 17DA
√ √
√ (2)
√
Power
HD45 17DS
√ √
√
√
Power
HD45 17DR
√ √
√ (1) √
Power
HD45 17DSR
√ √
√ √ (1) √
Power
HD45 17DVR
√ √
√ (2)
√ (1) √
Power
HD45 17DAR
√ √
√ (2)
√ (1) √
Power
HD45 7BV
√ √ √ (2)
Power
HD45 7BA
√ √ √ (2)
Power
HD45 7BS
√ √
√
Power
HD45 7BR
√ √
√ (1)
Power
HD45 7BSR
√ √
√ √ (1)
Power
HD45 7BVR
√ √ √ (2)
√ (1)
Power
HD45 7BAR
√ √ √ (2)
√ (1)
Power
HD45 7BDV
√ √ √ (2)
√
Power
HD45 7BDA
√ √ √ (2)
√
Power
HD45 7BDS
√ √
√
√
Power
HD45 7BDR
√ √
√ (1) √
Power
HD45 7BDSR
√ √
√ √ (1) √
Power
HD45 7BDVR
√ √ √ (2)
√ (1) √
Power
HD45 7BDAR
√ √ √ (2)
√ (1) √
Power
HD45 BV
√ √ (1)
Power
HD45 BA
√ √ (1)
Power
HD45 BS
√
√
Power
HD45 BR
√
√ (1)
Power
HD45 BSR
√
√ √ (1)
Power
HD45 BVR
√ √ (1)
√ (1)
4 LED
CO
2
level
HD45 BAR
√ √ (1)
√ (1)
4 LED
CO
2
level
HD45 BDV
√ √ (1)
√
Power
HD45 BDA
√ √ (1)
√
Power
HD45 BDS
√
√
√
Power
HD45 BDR
√
√ (1) √
Power
HD45 BDSR
√
√ √ (1) √
Power
HD45 BDVR
√ √ (1)
√ (1) √
Power
HD45 BDAR
√ √ (1)
√ (1) √
Power
HD45 / HD46 - 5 - V2.4
Serie HD46
Model UR T CO2
Analog
output
RS485
output
Relay
output
LCD Keys LED
HD46 17V
√ √
√ (2)
Power
HD46 17A
√ √
√ (2)
Power
HD46 17S
√ √
√
Power
HD46 17R
√ √
√ (2)
Power
RH,T
HD46 17SR
√ √
√ √ (2)
Power
RH,T
HD46 17DV
√ √
√ (2)
√
Power
HD46 17DA
√ √
√ (2)
√
Power
HD46 17DS
√ √
√
√
Power
HD46 17DTR
√ √
√ (2) √ √
Power
RH,T
HD46 17DTSR
√ √
√ √ (2) √ √
Power
RH,T
HD46 17BV
√ √ √ √ (3)
Power
HD46 17BA
√ √ √ √ (3)
Power
HD46 17BS
√ √ √
√
Power
HD46 17BR
√ √ √
√ (3)
Power
RH,T,CO
2
HD46 17BSR
√ √ √
√ √ (3)
Power
RH,T,CO
2
HD46 17BDV
√ √ √ √ (3)
√
Power
HD46 17BDA
√ √ √ √ (3)
√
Power
HD46 17BDS
√ √ √
√
√
Power
HD46 17BDTR
√ √ √
√ (3) √ √
Power
RH,T,CO
2
HD46 17BDTSR
√ √ √
√ √ (3) √ √
Power
RH,T,CO
2
In the “Analog output” and “Relay output” columns, the number of the available
outputs is indicated in brackets.
HD45 / HD46 - 6 - V2.4
2. FRONT PANEL DESCRIPTION
HD45… (except for HD45 BVR and HD45 BAR) HD45 BVR and HD45 BAR
HD46…
“
POWER” LED
LCD
Serial output with
mini-USB connector
“Air Quality”
LED indicators
Serial output with
mini-USB connector
HD45…D…
only
“POWER”
LED
“Humidity” LED
“
Temperature” LED
“
CO2” LED
LCD
Keyboard
Serial output with
mini-USB connector
HD46…D…only
HD46…DT…only
HD46 17B…R only
HD46…R only
HD46…R only
HD45 / HD46 - 7 - V2.4
“POWER” LED
Indicates power supply state. In models without display, it flashes if a fault
occurs.
LCD Display
It simultaneously displays all values measured by the instrument.
LED level indicators
They show air quality level. In HD45
BVR and HD45 BAR models only.
“Humidity” LED
It indicates when the set humidity threshold limits are exceeded and the
humidity relay is activated. It flashes if an error condition occurs in the
humidity measurement.
“Temperature” LED
It shows when the set temperature threshold limits are exceeded and the
temperature relay is activated. It flashes if an error condition occurs in the
temperature measurement.
“CO
2
” LED
It shows when the set CO
2
threshold limits are exceeded and the CO2 relay is
activated. It flashes if an error condition occurs in the CO
2
measurement.
Keyboard
It allows setting of instrument setup parameters and display backlight
activation.
MENU key
Accesses setup menu. Confirms set value.
ESC key
Exits parameter setting mode. Deletes not confirmed changes.
ARROW UP key
Scrolls through parameter list
. Increments selected parameter value.
ARROW DOWN key
Scrolls through parameter list
. Decrements selected parameter value.
Serial output with mini-USB connector.
Included in all models, it allows connection to a PC for instrument
configuration. Connection is obtained via the RS45 (not isolated) or RS45I
(isolated) special cable, which has a mini-USB connector for the instrument
and a USB connector for a PC. With the RS45 cable, the instrument is directly
powered through a PC’s USB port (at least a 500 mA USB port is required). The
special cable has a built-in USB adaptor.
Attention: the instrument must not be directly connected to your PC by means of
a standard mini-USB/USB adaptor cable, but with a RS45 or RS45I cable only.
HD45 / HD46 - 8 - V2.4
3. INSTALLATION AND CONNECTION
The choice of the number of transmitters to be used for a typical installation and their
location depends on multiple factors, among which the dimensions of the breathing
space to be monitored, the distribution of people in the environment and the presence
of a forced air system.
The transmitter shall be placed in an area which is representative of the
environmental conditions, at 1.5m height above the floor and at least 1m distance
from the corners.
Do not install the transmitter next to windows, outside doors, direct heat, air
conditioning or within occupants’ breathing zone.
In all models, sensors and electronics are housed inside a robust plastic case. The
grids at the bottom and top of the housing allow ambient air to reach the internal
sensitive elements.
To install the instrument, open the housing by pushing down the upper and lower
tabs, then pull to remove the front panel (Fig. 3.A).
Fig. 3.A: Opening the instrument
When opening the lid, you will see the holes for fixing the base of the transmitter
directly to a panel or to a wall. Fix the base so that connectors are positioned at the
bottom of the instrument, and slot matches the connection cable output (Fig. 3.B).
HD45 / HD46 - 9 - V2.4
Fig. 3.B: Fixing the instrument base
After fixing the base, proceed with the connection of the transmitter as shown in the
connection diagrams below. In order to make connection procedures easier, the
connection diagram of each model is impressed also at the interior of the base.
Once the connection procedure is completed, put the front panel in place again,
making sure that the upper and lower tabs are correctly inserted in their slots (Fig.
3.C).
Fig. 3.C: Closing the instrument
HD45 / HD46 - 10 - V2.4
3.1 HD45… connection diagrams
HD45 / HD46 - 11 - V2.4
3.2 HD46… connection diagrams
HD45 / HD46 - 12 - V2.4
4. OPERATION MODE
After installing and connecting the transmitter as shown in section INSTALLATION
AND CONNECTION, supply the instrument with the correct voltage. A wrong power
supply may cause permanent damage to the instrument.
“POWER” LED activation indicates that the instrument is being powered.
In models provided with a display, the indication of the transmitter model and
firmware version are displayed and, after a few seconds, measures are shown. The
instruments display all measured values simultaneously.
Temperature – Humidity Temperature Temperature – Humidity
and CO
2
and CO2 HD45 17…
HD46 17B… HD45 7B… HD46 17…
Fig. 4.A: Viewing measures in models with a display
Models are preset to display temperature in °C and relative humidity in %. You can
setup instruments to display temperature in °F and humidity as dewpoint.
Td = Dewpoint T
= T ambient – Td
Fig. 4.B: Viewing humidity as dewpoint
The instrument requires about 15 minutes to ensure stable measures and indicated
accuracy.
In models provided with a keyboard, you can turn on the display backlight by pressing
any key. Backlight turns off after 30 minutes of keyboard inactivity.
The instruments are factory preset to be immediately operative. The user can easily
customize the configuration of the instrument by connecting it to a PC or by means of
the front keyboard, for instruments supplied with a keyboard. For details on
configuration, see section “CONFIGURATION”.
The instruments are preset to operate in still air (< 0.25 m/s). To operate in circulating
air (e.g. in a climatic room), the operating mode of the instruments must be changed
(see the commands Cu0 and Cu1 on pag. 39).
HD45 / HD46 - 13 - V2.4
4.1 Analog outputs
HD45…V…, HD45…A…, HD46…V and HD46…A models have an analog voltage or
active current output for each measured value on the instrument. The output range
default value is 0…10V (for V models) or 4…20mA (for A models), and default
correspondence between output and range is as follows:
Tab. 4.A: Default settings for analog outputs
Temperature output Humidity output CO2 output
0V or 4mA = -20.0 °C 0V or 4mA = 0.0 % 0V or 4mA = 0
10V or 20mA = 80.0 °C 10V or 20mA = 100.0 % 10V or 20mA = 5000 ppm
Each output can be configured so as to make the output scale corresponding to a
preset range interval.
You can reverse the output operation, in order to make the output value decrease
when the measured value increases. You can also add or remove an offset to the
output minimum value in order to obtain 2…10Vdc or 0…20mA range.
For the configuration mode, see section “CONFIGURATION”.
In case of measure out of the set interval, the analog output remains fixed to
the extreme value if the measure is just a little out, and it becomes 11Vdc or
22mA if the measures is too over or under-range.
For a correct operation, please follow the load resistance specifications for the
analog outputs indicated in the technical data.
4.2 Relay outputs
HD45…R models have only one relay output, that can be associated to one of the
quantities measured by the instrument. The potential free contact output is preset
to close when the measure exceeds the threshold limit.
In HD46…R models, each quantity measured by the instrument is associated to a
relay output. Relay activation is indicated by the turning on of the corresponding LED
situated in the instrument front panel. The potential free contact output is preset to
close when the measure exceeds the threshold limit for CO
2
and humidity, and to
close when the measure falls below
the threshold limit for temperature.
Thresholds and hysteresis can be configured. Relays can operate in various modes,
with one or two thresholds. Each relay output can be configured to operate differently
from the others. The relay contact can also be set to close when an error occurs
concerning a measured quantity, for example in case of a sensor fault or of an over
range measure. For the relay configuration mode, see section “CONFIGURATION”.
The employed relays are bistable, so there isn’t a rest state. In case of no power
supply, the relay contact holds its last set position.
Rela
y output in HD45…R models
In HD45
17…R and HD45 7B…R models, the relay is factory associated with
temperature while, in HD45
B…R , it is associated with CO
2
measurement. The relay
can be used in two modes:
HD45 / HD46 - 14 - V2.4
• Simplified mode: the relay functions with a single threshold, that can be selected
from a series of fixed values via a rotary switch.
• Complete mode: the relay may function with one or two thresholds that can be
freely set via a PC.
Toggling between the two modes is made by means of a rotary selector placed on the
instrument electric board, between the terminal board and the mini-USB connector.
Fig. 4.C: Rotary selector position
The selector has ten numbered positions ranging from 0 to 9.
If the selector is in position 0 (default setting), we are in complete mode and the
instrument operates with thresholds and hysteresis set via software (see Tab. 4.B for
factory settings).
Tab. 4.B: Relay output default settings in HD45 models
Temperature (HD45 17…R and HD45 7B…R) CO2 (HD45 B…R)
Threshold = 100.0 °C Threshold = 1000 ppm
Hysteresis = 5.0 °C Hysteresis = 100 ppm
If the selector is in a position other than zero, we are in simplified mode: the relay
activates only on the threshold set with the rotary selector.
If the selector is associated with the CO
2
measurement, each position corresponds to a
threshold value according to the table below:
Tab. 4.C: CO
2
threshold rotary selector
POSITION CO2 RELAY THRESHOLD (ppm)
0 Rotary selector disabled
1 600
2 800
3 900
4 1000
5 1200
6 1400
7 1600
8 1800
9 2000
Mini-USB
connector
Rotary
switch
T
erminal board
HD45 / HD46 - 15 - V2.4
If the selector in a position other than zero, hysteresis is preset to 100 ppm.
Hysteresis and intervention mode can be changed via software (see section
“CONFIGURATION”). Please note, however, that hysteresis and intervention mode
with the rotary selector in zero position differ from hysteresis and intervention mode
with the rotary selector in position other than zero.
If the relay is associated with temperature, the selector is preset as follows:
Tab. 4.D: Default settings for temperature selector
POSITION TEMPERATURE RELAY THRESHOLD (°C)
0 Rotary selector disabled
1 18.0
2 23.0
3 28.0
4 33.0
5 38.0
6 43.0
7 48.0
8 53.0
9 58.0
Hysteresis is preset to 5.0°C and can be modified. Either threshold 1 value and the
interval between subsequent positions can be changed. For settings, see section
“CONFIGURATION”.
Rela
y outputs in HD46…R models
In HD46…R models as well, the relay can be used in two modes:
• Simplified mode: relays operate with a single, freely settable threshold; if the
instrument is supplied with a keyboard, it has a threshold
quick setting mode.
• Complete mode: relays can operate with one or two thresholds, the quick
setting mode is disabled.
The instrument is preset in complete mode with the following thresholds:
Tab. 4.E: Relay output default settings in HD46 models
(complete mode)
Temperature Humidity CO2
Threshold = 20.0 °C Threshold = 50.0 % Threshold = 1000 ppm
Hysteresis = 5.0 °C Hysteresis = 5.0 % Hysteresis = 100 ppm
If the simplified mode is enabled, the preset thresholds will be as follows:
Tab. 4.F: Relay output default settings in HD46 models
(simplified mode)
Temperature Humidity CO2
Threshold = 21.0 °C Threshold = 50.0 % Threshold = 800 ppm
Hysteresis = 5.0 °C Hysteresis = 5.0 % Hysteresis = 100 ppm
Please note that thresholds and relay operation modes in simplified mode differ from
thresholds and relay operation modes in complete mode, see section “CONFIGURATION”.
HD45 / HD46 - 16 - V2.4
In simplified mode, if the instrument is supplied with display and keyboard, thresholds
can easily be viewed and changed by pressing the MENU key (for least than 2 seconds).
The threshold values of the quantities measured by the instrument are shown on the
display. The S symbol on top left of the display indicates that you are in the threshold
values screen. A full flashing cursor appears next to one of the available thresholds.
Thresholds can be changed as follows:
1. If necessary, move the cursor on the desired threshold with “
▼” and “▲” keys.
2. Press MENU, the cursor passes in “underlined” mode.
3. Change the value with “
▼” and “▲”keys.
4. Confirm by pressing MENU (or press ESC if you don’t want to save the
changes).
HD45 / HD46 - 17 - V2.4
At the end, press ESC to return to the measuring mode. The instrument will
automatically go back to the measuring mode if you don’t press any key for 30
seconds.
The quick setting mode is not protected by an access code and thresholds can be
changed only within predetermined limits, that shall be set with the following values:
Tab. 4.G: Default settings for threshold limits in HD46 models
(simplified mode)
Temperature Humidity CO2
Threshold min. = 15.0 °C Threshold min. = 20.0 % Threshold min. = 600 ppm
Threshold max. = 25.0 °C Threshold max. = 70.0 % Threshold max. = 2000 ppm
To change intervals, hysteresis and relay activation modes, see section
“CONFIGURATION”.
In the simplified mode, the two threshold level mode is not available.
In models with keyboard, the simplified mode can be enabled by changing the P#063
parameter (see section “Configuration by means of a keyboard”).
Note: when an “M” appears on the top left side of the display (indicating access code
enabled) and the MENU key is pressed, the threshold screen is not displayed, but you
access the complete configuration mode (see section “Configuration by means of a
keyboard”).
Rela
y operation in “Complete mode”
When the instrument is set in complete relay operation mode, each relay is associated
with two configurable thresholds, named A and B. You can select either to make
relays operate with both thresholds or with one of the two. The relay possible
operating modes are as follows:
1. Relay always disabled
The contact is always open.
This mode is helpful in system maintenance and instrument configuration.
2. Relay always enabled
The contact is always closed.
This mode is helpful in system maintenance.
3. Relay activates below threshold B
The contact is closed if the measuring value falls below threshold B value. The
contact is open if the measuring value is above threshold.
4. Relay activates above threshold A
The contact is closed if the measuring value rises above threshold A value. The
contact is open if the measuring value is below threshold.
5. Relay activates above threshold A and below threshold B.
Relay action is different depending if threshold A value is greater or lower than
threshold B value.
HD45 / HD46 - 18 - V2.4
If threshold A value is greater than threshold B value, the contact is closed if the
measuring value rises above threshold A value or falls below threshold B value. The
contact is open if the measuring value is within the two threshold values.
If threshold A value is lower than threshold B value, the contact is open if the
measuring value rises above threshold B value or falls below threshold A value.
The contact is closed if the measuring value is within the two threshold values.
6. Relay activates below threshold B with hysteresis
The contact closes if the measured value falls below threshold B. Contact opens
if the measured value rises above the threshold value plus the hysteresis (B+H).
HD45 / HD46 - 19 - V2.4
7. Relay activates above threshold A with hysteresis
The contact closes when the measuring value rises above threshold A value. The
contact opens if the measuring value falls below the threshold minus the
hysteresis (A-H).
8. Relay activates above threshold A and below threshold B with hysteresis
Relay action is different depending if threshold A value is greater or lower than
threshold B value.
If threshold A value is greater than threshold B value, the contact is closed if the
measuring value rises above threshold A value or falls below threshold B value.
The contact is open if the measuring value is within the interval ranging between
threshold B plus the hysteresis (B+H) and threshold A minus the hysteresis
(A-H).
HD45 / HD46 - 20 - V2.4
If threshold A value is lower than threshold B, the contact opens if the
measuring value rises above threshold B value or falls below threshold A value.
The contact closes if the measuring value is within the interval ranging between
threshold A plus the hysteresis (A+H) and threshold B minus the hysteresis
(B-H).
In this mode, the hysteresis amplitude should be lower than the difference
between the two intervention thresholds.
Hysteresis prevents the relay oscillation between the two states, when the measuring
value is very close to the set threshold value. The hysteresis value can be zeroed or
the operation mode without hysteresis can be used; however, it is recommended to
keep hysteresis active in order to avoid malfunctions near the relay intervention point.
In HD45, the factory-set functionality is “Relay active above threshold A with
hysteresis”.
In HD46, the factory-set functionality is “Relay active above threshold A with
hysteresis” for CO
2
and humidity, and “Relay active below threshold B with hysteresis”
for temperature.
Further to the above mentioned modes, the relay contact can also be made to close
when an error occurs relating to the measured quantity, for example in case of sensor
fault or of a value measured over the set range.
Thus, the relay can be used:
• only to check the measured quantity;
• only to signal an error condition;
• either to control the measured quantity and to indicate an error condition.
In the last case, as it is not possible to make out if the relay contact is closed to
indicate an error or because the instrument is adjusting the measured quantity, it is
necessary to verify if the instrument is indicating a fault on the display or through a
LED (see section 4.5 “Indicating a fault”).
Each relay operating mode is set via connection to a PC, with the help of DeltaLog14
program or through the protocol specified in section “COMMUNICATION PROTOCOL”.
Settings can be performed also via a RS485 connection (see section “RS485
CONNECTION”) or by means of the front keyboard (see section “Configuration through
a keyboard”, if available.
HD45 / HD46 - 21 - V2.4
4.3 LED indicators in HD45 BVR and HD45 BAR models
HD45 BVR and HD45 BAR models are supplied with four LEDs which show the air
quality level.
The passage from a level to the other is established based on the values of three
thresholds, preset to the following values.
Lower threshold = 600 ppm
Medium threshold = 800 ppm
Upper threshold = 1400 ppm.
The level indication is obtained according to the following procedure:
Optimal: It is on the green LED
CO2 < Lower threshold (600 ppm)
Satisfying: it is on the green LED
CO2 > Lower threshold (600 ppm)
CO
2
< Medium threshold (800 ppm)
Mediocre: It is on the yellow LED
CO2 > Medium threshold (800 ppm)
CO
2
< Upper threshold (1400 ppm)
Poor: It is on the red LED
CO2 > Upper threshold (1400 ppm)
LEDs turn off when the measuring value falls below the threshold minus the
hysteresis, which is common to the three thresholds and is factory preset to 20 ppm.
Threshold values and hysteresis can be configured. For the setting procedure, see
section “CONFIGURATION”.
LED indicators operate independently from relay operation. Indicator thresholds and
hysteresis are different parameters than relay thresholds and hysteresis. So, relay can
be activated at different values than LED thresholds.
4.4 Logging
Instruments are in continuous logging mode from the moment they are powered. The
logging interval is preset to 5 minutes.
The instrument can store up to 2304 samples. Each sample consists of all the values
measured by the instrument. Samples do not include date and time of data
acquisition.
Memory is managed in a circular way, so that, when memory is full, the most recent
samples overwrite the older ones.
If power supply is interrupted and then restored, logging is restarted in a new session,
allowing in this way identification of stored data in the current run session.
Stored values can be downloaded to a PC with the help of the application program
DeltaLog14 or through the protocol indicated in the section “COMMUNICATION
PROTOCOL”.
HD45 / HD46 - 22 - V2.4
The logging interval can be set to 1 minute or 30 seconds. For the interval change
mode, see section “CONFIGURATION”.
4.5 Indicating a fault
All models have an error signal mode.
Models with display indicate an error condition by displaying an “E” on a black
background, alternated to the error code, on bottom left of screen.
Fig. 4.D: Error condition signal
Several errors are indicated in a sequence, alternated by the symbol “E”:
Tab. 4.H: Error codes
ERROR
CODE
DESCRIPTION
1 Humidity module not present or faulty
2 Error in humidity module calibration data
3 Humidity module calibration data not present
4 Error in configuration and/or calibration data
5 Program memory altered
6 Error in temperature calibration
7 Temperature measure out of range
8 Humidity measure out of range
9 CO2 measure out of range
In models without display, when an error occurs, the “POWER” LED flashes a number
of times equal to the error number, spaced by a sequence of quick flashes. Several
errors are indicated in a sequence, spaced by quick flashes.
In HD46…R models, when an error occurs in measuring a quantity, the respective
LED flashes.
In HD45…V…, HD45…A…, HD46…V and HD46…A models, the analog output is set
to 11Vdc or 22mA if there is a measuring error (for example, in case of sensor fault).
HD45 / HD46 - 23 - V2.4
5. CONFIGURATION
All transmitters have a mini-USB type, serial connector, located on the instrument
side (Fig. 5.A), through which the instrument can be connected to a PC for
configuration parameters setup.
Connection is made by means of the special RS45 (not isolated) or RS45I (isolated)
cable, which has a built-in USB adaptor and is supplied with a mini-USB connector for
the instrument plus a USB connector for the PC. For a correct connection, USB drivers
included in the DeltaLog14 software package (the software can be downloaded from
the Delta OHM website) must be installed in your PC.
Attention: the serial connection will not work if the instrument is directly connected to
a PC by means of a standard mini-USB/USB adaptor cable. For a serial connection,
you will need the special RS45 or RS45I cable.
With the RS45 cable, the instrument is powered directly by the USB port of a PC (at
least a 500 mA USB port is required), allowing in this way on-site instrument
configuration by means of a portable PC.
The PC can be connected even if the instrument has been already installed and power
supplied; the instrument is designed to avoid interferences between the two power
supplies. With the RS45I cable, the instrument is not powered by the PC USB port.
Fig. 5.A: Serial connection (mini-USB connector)
The instrument parameters setup can be easily performed by means of the application
program for PC DeltaLog14 In such case, please refer to the software manual for
parameters setting.
The instrument can also be configured through the serial connection without the help
of the application program DeltaLog14, by using the serial protocol indicated in
section “COMMUNICATION PROTOCOL”.
In HD45…S… and HD46…S… models, the instrument setup can be performed
through a RS485 connection. See section “RS485 COMMUNICATION”.
HD46…DT… models can be configured by means of the front keyboard, with no need
of PC connection. For keyboard setting, please refer to section “Configuration through
keyboard”.
The instrument continues to measure normally also when it is in configuration mode;
any analog outputs or relays are regularly updated for the measured values. Changes
made to parameters have an immediate effect (from measure cycle next to parameter
confirmation).
RS45 or RS45I cable
connected to the serial port
HD45 / HD46 - 24 - V2.4
5.1 Authorization levels
For the instrument configuration parameters setup, various authorization levels have
been planned, so as to prevent any changes to the instrument functions by nonauthorized personnel. Each parameter is associated with an authorization level, which
can differ from that of other parameters.
The following authorization levels have been provided:
Level 0: operator level.
Level 1: administrator level.
Level 0 parameters are not protected and can be displayed and changed by every
operator.
Level 1 parameters are protected by an access code. To view and change the
parameters, the user needs an access code.
The default level is 1.
For level 1 parameters, the default value for the access code is 000000, that can be
changed by the user via serial connection, if necessary, with the help of DeltaLog14
If the access code is changed, make sure to keep the new code in a safe
place. There are no commands for the “reset” of the access code. The loss of
the code precludes the possibility to change the configuration parameters set
to authorisation level 1.
In case of loss of the access code, the user shall address the technical service giving
them a number supplied by the instrument, through which it will be possible to
trace the code in the transmitter memory.
The number to be communicated is obtained via serial connection, by means of
DeltaLog14 application program or through the command PW of the communication
protocol (see section “COMMUNICATION PROTOCOL”).
In models with keyboard, the number to be communicated can be obtained following
the steps below:
1. Press MENU for at least 2 seconds, until the message “Press MENU to edit
parameters” appears on the display.
2. Using “
▼” and “▲” keys, enter any number as first digit of the access code and
confirm with MENU.
3. Press MENU five times without entering any digits.
4. Take note of the number that will appear on the display and call the technical
service.
HD45 / HD46 - 25 - V2.4
5.2 Configuration through keyboard (HD46…DT… only)
In models with keyboard, press and hold the MENU key for at least 2 seconds to
access the configuration mode, until the message “Press MENU to edit parameters”
appears on the display.
To access as operator (level “0”), simply press the MENU key. The only viewable
parameters will be those in level “0”.
To access as administrator (level “1”), it is necessary to enter the 6-digit access code.
In such case, don’t press MENU when the message “Press MENU to edit parameters”
appears, but press “
▼” or “▲” to set the first digit of the code.
Confirm the entered digit by pressing MENU, the cursor will move on the second digit.
Enter the other 5 code digits in the same way.
Note: the entered digit remains “in evidence” for one second, then it is replaced by an
asterisk, even if it hasn’t yet been confirmed. Even if it is no more visible, the digit
has been set and can be confirmed by pressing MENU.
The default value for the access code is 000000.
For each parameter, the following will be displayed: sequence number, parameter
value and authorization level.
Authorization
level
Parameter
number
Parameter
value
HD45 / HD46 - 26 - V2.4
The complete list of the available parameters is indicated in Tab. 5.A (page 29).
Select the desired parameter with “
▼” and “▲” keys.
To quickly scroll through the list, press and hold one of the two arrow keys.
The parameter value is preceded by the indication (d) if expressed in decimals, or by
(h) if expressed in hexadecimals.
Press the MENU key to access Edit mode, a full flashing cursor will appear in
correspondence with the parameter value.
At this point, you can select if to edit the parameter value or the authorization level.
Chan
ging the parameter value
When the full cursor flashes on the parameter value, press again the MENU key. The
cursor moves to the “underlined” mode.
HD45 / HD46 - 27 - V2.4
Use the “▼” and “▲” keys to increment or decrement the value.
Confirm by pressing the MENU key, the cursor disappears.
At this point, you can scroll again through the parameter list with the arrow keys.
Chan
ging the protection level
When the full cursor flashes on the parameter value, press again the “
▼” or “▲” keys
to move the full flashing cursor on the level value.
Press the MENU key, the cursor will move to the “underlined” mode.
HD45 / HD46 - 28 - V2.4
Use the “▼” and “▲” keys to increment or decrement the value.
Confirm by pressing MENU, the cursor disappears.
At this point, you can scroll again through the parameter list with the arrow keys.
The authorization level can be changed only if you are in configuration mode as
administrator, that is through an access code. If a parameter is set to level 0, and you
accessed the configuration mode as an operator, the level cannot be increased, but
only changed.
Esca
ping from configuration mode
To exit configuration mode, press the ESC key at any time.
If the cursor is not on the display, by pressing ESC the instrument returns directly to
the measuring mode. If on the contrary the cursor is displayed, the instrument exits
edit mode (the cursor disappears) but remains in configuration mode; press again
ESC to exit.
Any changes which have not been confirmed, will be deleted.
The instrument leaves automatically the configuration mode and returns to the
measuring mode if keys are not pressed for 30 seconds.
If the access code has been entered, it remains active for 5 minutes after returning to
the measuring mode. If MENU is pressed for less than 2 seconds within the 5-minute
HD45 / HD46 - 29 - V2.4
interval, the instrument directly accesses configuration mode without asking the
access code. The access code condition is shown by an “M” displayed on left top of the
screen.
To disable the access code before the 5-minute interval has elapsed, press and hold
the MENU key for at least 2 seconds, until the message “Press MENU to edit
parameters” is displayed, then access configuration mode as an operator by pressing
MENU and exit by pressing ESC.
Confi
guration parameters list
The table below shows the complete list of the instrument parameters, along with
settable values and default values (“DEFAULT” column).
Tab. 5.A: Configuration parameters
P# DESCRIPTION VALUE DEFAULT NOTE
000 User code Alphanumeric code
Max 34 digits.
(1)
001 User calibration date
(2)
002 Number of samples to be averaged
for measure printing on serial port
MIN: 1
MAX: 20
1
003 CO2 calibration point (ppm) MIN: 200
MAX: 600
400
004 Atmospheric pressure (hPa) MIN: 0
MAX: 3000
1013
005 Logging interval 0: 30 seconds
1: 1 minute
2: 5 minutes
2
006 Temperature measuring unit 0: °C
1: °F
0
007 Humidity measuring type 0: RH%
1: Dewpoint T
d
in °C
2: T
ambient
-Td in °C
0
008 CO2 output configuration 00: standard
(0…10V or 4…20mA)
01: remove offset
(0…10V or 0…20mA)
02: add offset
(2…10V or 4…20mA)
04: invert standard
(10…0V or 20…4mA)
05: invert and remove offset
(10…0V or 20…0mA)
06: invert and add offset
(10…2V or 20…4mA)
00
009 Temperature output configuration As P#008 00
010 Humidity output configuration As P#008 00
(1) Can be changed only through serial connection.
(2) Automatically updated by PC application software following to calibration.
HD45 / HD46 - 30 - V2.4
Temperature analog output (°C)
P# DESCRIPTION VALUE DEFAULT NOTE
011 Minimum °C temperature that can
be associated to minimum scale
analog output (x10)
MIN: -300 (-30.0°C)
MAX: P#012
-300
(3)
012 °C temperature at minimum scale
analog output (x10)
MIN: P#011
MAX: P#013 – P#015
-200
(3)
013 °C temperature at 10V or 20mA
analog output (x10)
MIN: P#012 + P#015
MAX: P#014
800
(3)
014 Maximum °C temperature that can
be associated to 10V or 20mA
analog output (x10)
MIN: P#013
MAX: 850 (85.0°C)
850
(3)
015 Minimum °C temperature range for
analog output (x10)
MIN: 100 (10.0°C) 200
(3)
(3) The displayed value is the quantity value multiplied by 10 (decimal point not shown).
Temperature (°F) analog output
P# DESCRIPTION VALUE DEFAULT NOTE
016 Minimum °F temperature that can
be associated to minimum scale
analog output (x10)
MIN: -220 (-22.0°F)
MAX: P#017
-220
(3)
017 °F temperature at minimum scale
analog output (x10)
MIN: P#016
MAX: P#018 – P#020
-40
(3)
018 °F temperature at 10V or 20mA
analog output (x10)
MIN: P#017 + P#020
MAX: P#019
1760
(3)
019 Maximum °F temperature that can
be associated to 10V or 20mA
analog output (x10)
MIN: P#018
MAX: 1850 (185.0°F)
1850
(3)
020 Minimum °C temperature range for
analog output (x10)
MIN: 180 (18.0°F) 360
(3)
(3) The displayed value is the quantity value multiplied by 10 (decimal point not shown).
Humidity analog output (RH%)
P# DESCRIPTION VALUE DEFAULT NOTE
021 Minimum % relative humidity that
can be associated to minimum
scale analog output (x10)
MIN: 0 (0.0%)
MAX: P#022
0
(3)
022 % relative humidity at minimum
scale analog output (x10)
MIN: P#021
MAX: P#023 – P#025
0
(3)
023 % relative humidity at 10V or
20mA analog output (x10)
MIN: P#022 + P#025
MAX: P#024
1000
(3)
024 Maximum % relative humidity that
can be associated to 10V or 20mA
analog output (x10)
MIN: P#023
MAX: 1000 (100.0%)
1000
(3)
025 Minimum % relative humidity range
for analog output (x10)
MIN: 100 (10.0%) 200
(3)
(3) The displayed value is the quantity value multiplied by 10 (decimal point not shown).
HD45 / HD46 - 31 - V2.4
Humidity analog output (Td °C)
P# DESCRIPTION VALUE DEFAULT NOTE
026 Minimum °C dewpoint that can be
associated to minimum scale
analog output (x10)
MIN: -400 (-40.0°C)
MAX: P#027
-400
(3)
027 °C dewpoint at minimum scale
analog output (x10)
MIN: P#026
MAX: P#028 – P#030
-300
(3)
028 °C dewpoint at 10V or 20mA
analog output (x10)
MIN: P#027 + P#030
MAX: P#029
800
(3)
029 Maximum °C dewpoint that can be
associated to 10V or 20mA analog
output (x10)
MIN: P#028
MAX: 850 (85.0°C)
850
(3)
030 Minimum °C dewpoint range for
analog output (x10)
MIN: 50 (5.0°C) 200
(3)
(3) The displayed value is the quantity value multiplied by 10 (decimal point not shown)
Humidity analog output (T
ambient
- Td °C)
P# DESCRIPTION VALUE DEFAULT NOTE
031 Minimum °C Ta-Td that can be
associated to minimum scale
analog output (x10)
MIN: 0
MAX: P#032
0
(3)
032 °C Ta-Td at minimum scale analog
output (x10)
MIN: P#031
MAX: P#033 – P#035
0
(3)
033 °C Ta-Td at 10V or 20mA analog
output (x10)
MIN: P#032 + P#035
MAX: P#034
400
(3)
034 Maximum °C Ta-Td that can be
associated to 10V or 20mA analog
output (x10)
MIN: P#033
MAX: 450 (45.0°C)
450
(3)
035 Minimum °C Ta-Td range for analog
output (x10)
MIN: 50 (5.0°C) 100
(3)
(3) The displayed value is the quantity value multiplied by 10 (decimal point not shown).
CO2 analog output (ppm)
P# DESCRIPTION VALUE DEFAULT NOTE
036 Minimum CO2 ppm value that can
be associated to minimum scale
analog output
MIN: 0
MAX: P#037
0
037 CO2 ppm value at minimum scale
analog output
MIN: P#036
MAX: P#038 – P#040
0
038 CO2 ppm value at 10V or 20mA
analog output
MIN: P#037 + P#040
MAX: P#039
5000
039 Maximum CO2 ppm value that can
be associated to 10V or 20mA
analog output
MIN: P#038
MAX: 5200
5200
040 Minimum CO2 ppm value for analog
output
MIN: 1000 1000
HD45 / HD46 - 32 - V2.4
Relay outputs
P# DESCRIPTION VALUE DEFAULT NOTE
041 Relay operating mode in HD45
models and CO
2
relay operating
mode in HD46 models with
simplified mode disabled.
In HD45 models, this is the mode with
rotary selector in position 0.
In HD46 models, this is the mode when
the threshold simplified setting is
disabled.
00: always disabled
01: active below threshold B
02: active over threshold A
03: active over threshold A
and below threshold B
05: active below threshold B
with hysteresis
06: active over threshold A
with hysteresis
07: active over threshold A
and below threshold B
with hysteresis
08: active only if in error
09: active below threshold B
and if in error
0A: active over threshold A
0B: active over threshold A,
below threshold B and if
in error
0D: active below threshold B
with hyster. and in error
0E: active over threshold A
with hyster. and in error
0F: active over threshold A
and below threshold B
with hyster. and in error
FF: always enabled
06
(6)
042 Temperature relay operating mode
in HD46 models with simplified
mode disabled.
As P#041 05
043 Humidity relay operating mode in
HD46 models with simplified mode
disabled.
As P#041 06
044 Threshold B relay in HD45 and CO2
relay in HD46
(relay activated below
threshold)
Thres. is in ppm if associated with CO2.
Threshold is x10 if associated with
humidity or temperature in HD45
Over the whole range 1000
(3),(4)
(6)
045 Threshold B (x10) temp. relay in
HD46 (relay activated below thres.)
Over the whole range 200
(3),(4)
046 Threshold B (x10) humidity relay in
HD46 (relay activated below thres.)
Over the whole range 500
(3),(4)
047 Threshold A relay in HD45 and CO2
relay in HD46
(relay activated over
threshold)
Thres. is in ppm if associated with CO2.
Threshold is x10 if associated with
humidity or temperature in HD45.
Over the whole range 1000
(3),(4)
(6)
048 Threshold A (x10) temp. relay in
HD46
(relay activated over thres.)
Over the whole range 200
(3),(4)
049 Threshold A (x10) humidity relay in
HD46 (relay activated over thres.)
Over the whole range 500
(3),(4)
HD45 / HD46 - 33 - V2.4
Relay outputs
P# DESCRIPTION VALUE DEFAULT NOTE
050 Hysteresis relay in HD45 and CO2
relay in HD46
In HD45… models it is the hysteresis
when the rotary selector is in position 0
Value is in ppm if associated with CO
2
.
Value is x10 if associated with humidity
or temperature in HD45.
Over the whole range 100
( HD45 B,
HD46)
50
( HD45 17,
HD45 7B)
(3),(4)
051 Hysteresis (x10) temperature relay
in HD46
Over the whole range 50
(3),(4)
052 Hysteresis (x10) humidity relay in
HD46
Over the whole range 50
(3),(4)
053 Relay assignment in HD45…R 0: not assigned
1: CO
2
2: Temperature
3: Humidity
1
(HD45 B)
2
( HD45 17,
HD45 7B)
(5)
054 Lower threshold in ppm for LED
indicators in HD45
BVR and
HD45
BAR model
MIN: 400
MAX: 800
600
(5)
055 Medium threshold in ppm for LED
indicators in HD45
BVR and
HD45
BAR model
MIN: 500
MAX: 2000
800
(5)
056 Upper threshold in ppm for LED
indicators in HD45
BVR and
HD45
BAR model
MIN: 1000
MAX: 4000
1400
(5)
057 Threshold hysteresis in ppm for
LED indicators in HD45
BVR and
HD45
BAR model
MIN: 0
MAX: 100
20
(5)
062 Relay operating mode in HD45
models when rotary selector is in
position other than 0.
0: Active below threshold
1: Active over threshold
1
(5)
063 Relay simplified mode activation in
HD46 models
0: Disable simplified mode
1: Enable simplified mode
0
064 CO2 relay operating mode in HD46
with simplified mode enabled.
0: Active below threshold
1: Active over threshold
1
065 Temperature relay operating mode in
HD46 with simplified mode enabled.
0: Active below threshold
1: Active over threshold
1
066 Humidity relay operating mode in
HD46 with simplified mode
enabled.
0: Active below threshold
1: Active over threshold
1
082 Rotary selector threshold in
position 1 when the relay is
associated with humidity or
temperature measure (x10)
Over the whole range 180
(4),(5)
083 Rotary selector increment for
positions 2…9 when the relay is
associated with humidity or
temperature measure (x10)
Over the whole range 50
(4),(5)
084 Relay hysteresis when rotary
selector is in position other than 0
(x10 if related to humidity or
temperature)
Over the whole range 100
(HD45 B)
50
( HD45 17,
HD45 7B)
(4),(5)
HD45 / HD46 - 34 - V2.4
Relay outputs
P# DESCRIPTION VALUE DEFAULT NOTE
085 Ppm threshold for CO2 relay in
HD46 models with simplified mode
enabled.
Over the whole range 800
(6)
086 Temperature relay threshold (X10)
in HD46 models with simplified
mode enabled.
Over the whole range 210
(3),(4)
(6)
087 Humidity relay threshold (X10) in
HD46 models with simplified mode
enabled.
Over the whole range 500
(3),(4)
(6)
088 Minimum possible threshold in ppm
for CO
2
relay in HD46 models with
simplified mode enabled.
Over the whole range 600
089 Minimum possible threshold (x10) for
temperature relay in HD46 models
with simplified mode enabled.
Over the whole range 150
(3),(4)
090 Minimum possible threshold (x10)
for humidity relay in HD46 models
with simplified mode enabled.
Over the whole range 200
(3),(4)
091 Minimum possible threshold in ppm
for CO
2
relay in HD46 models with
simplified mode enabled.
Over the whole range 2000
092 Maximum possible threshold (x10)
for temp. relay in HD46 models
with simplified mode enabled.
Over the whole range 250
(3),(4)
093 Maximum possible threshold (x10)
for humidity relay in HD46 models
with simplified mode enabled.
Over the whole range 700
(3),(4)
(3) The displayed value for temperature and humidity is the quantity value multiplied by 10 (decimal
point not displayed).
(4) The parameter measuring unit is the same as the respective measured quantity, set with P#006
and P#007 parameters.
(5) This parameter is for HD45 models.
(6) In HD45 models with relay, if the hardware threshold selector is in position other than 0, the relay
operates only with threshold set via hardware, A and B thresholds are not taken into account.
In HD46 models, if the simplified mode is enabled, relays operate with P#085, P#086 and P#087
thresholds. A and B thresholds are not taken into account.
MODBUS-RTU RS485 serial communication
P# DESCRIPTION VALUE DEFAULT NOTE
058 RS485 address MIN: 1
MAX: 247
1
059 RS485 Baud rate 0: 9600
1: 19200
1
060 RS485 transmission mode
Data Bits = 8
Parity:N= none, E= even, O= odd
Stop Bits: 1= 1bit, 2= 2 bit
0: 8 N 1
1: 8 N 2
2: 8 E 1
3: 8 E 2
4: 8 O 1
5: 8 O 2
2
061 Receiving mode after RS485
transmission
0: do not respect protocol
and starts receiving after
transmission
1: respects the protocol and
waits for 3,5 char. after
transmission
1
HD45 / HD46 - 35 - V2.4
Note: the parameters which are not included in Tab. 5.A are not used and
cannot be entered.
The instrument always lists all parameters included in Tab 5.A, even if some
of these are not scheduled for that particular model, for example because it
has no analog outputs or no relays. Changing these parameters will produce
no effects.
Exam
ple of relay output configuration by means of the keyboard
Suppose you wish to have the humidity relay activated when the measured value is:
• Greater than 60.0%
• Lower than 35.0%
applying a 3.0% hysteresis.
You will have to select, accordingly, the mode “Relay active over threshold A and
below threshold B with hysteresis”. The operation mode with two thresholds requires
the threshold quick setting mode to be disabled.
According to Tab 5.A, the humidity relay output configuration parameters are P#043,
P#046, P#049, P#052 and P#063. Setup these parameters with the following values:
• Humidity relay operative mode P#043 = 07
• Threshold B for humidity relay P#046 = 350 (the decimal point is not displayed)
• Threshold A for humidity relay P#049 = 600 (the decimal point is not displayed)
• Hysteresis for humidity relay P#052 = 30 (the decimal point is not displayed)
• Simplified mode activation P#063 = 0 (default setting)
The complete procedure is as follows:
1. Press MENU to access configuration mode.
2. Enter the access code if parameters have been assigned authorization level 1
(default setting), or press MENU if the parameters level is 0.
3. Select parameter P#063 with the “
▼” and “▲” keys, check that value is 0
(default setting).
4. If P#063 value is other than 0, press MENU twice to access the Edit mode and
change the value to 0 with the “
▼” and “▲” keys, then press MENU to
confirm.
5. Select parameter P#043 with the “
▼” key, then press MENU twice to access
Edit mode.
6. Change P#043 value to 07 with the “
▼” and “▲” keys, then press MENU to
confirm.
7. Select P#046 parameter with the “
▲” key, then press MENU twice to access
Edit mode.
8. Change P#046 value to 350 with the “
▼” and “▲” keys, then press MENU to
confirm.
HD45 / HD46 - 36 - V2.4
9. Select parameter P#049 with the “▲” key, then press MENU twice to access
Edit mode.
10. Change P#049 value to 600 with the “
▼” and “▲” keys, then press MENU to
confirm.
11. Select P#052 parameter with the “
▲” key, then press MENU twice to access
Edit mode.
12. Change P#052 value to 30 with the “
▼” and “▲” keys, then press MENU to
confirm.
13. Press ESC to exit Configuration mode.
HD45 / HD46 - 37 - V2.4
6. CALIBRATION
Instruments are factory-calibrated and normally don’t require further interventions by
the user.
The relative humidity and temperature sensors user calibration is not
foreseen.
In HD46… models, relative humidity and temperature sensors, along with stored
calibration data, are included in a module that can be easily replaced by a new one
(HDM46 code). Modules are factory-calibrated and don’t require user
calibration. The replaced module can be sent to factory for recalibration.
However, for CO
2
measuring modules, a new calibration can be performed for sensor
offset correction.
6.1 Replacement of R.H. and temperature module (HD46…only)
To replace the relative humidity and temperature module, open the housing by
pressing down the upper and lower tabs, then pull to remove the front panel (see Fig.
3.A in section “INSTALLATION AND CONNECTION”.
Ensure power supply is not connected (PC not connected to mini-USB serial
connector).
The module is located next to the terminal block, under the mini-USB serial connector
(Fig. 6.A). To remove it, gently pull upwards.
Fig. 6.A: R.H. and temperature module position in HD46… models
Put the new module in place of the removed module, paying attention to position it in
the correct direction (module contact pins must be positioned towards the mini-USB
serial connector).
Once the procedure has been completed, reconnect the power supply and relocate the
front panel ensuring to correctly position the upper and lower tabs.
Mini-USB
Connector
R.H. and
temperature
module
Terminal block
HD45 / HD46 - 38 - V2.4
6.2 CO2 sensor calibration
CO2 sensor calibration check can be performed every three/four years.
For a correct sensor calibration, it is crucial to know and respect the physical
phenomena that represent measurement bases: for this reason, we recommend to
thoroughly follow the information below and to perform new calibrations only if in
possession of adequate technical knowledge.
CO
2
sensor can be calibrated in clean air. Each new calibration deletes the previous
one.
To calibrate the sensor, proceed as follows:
1. Ensure the instrument is actually in clean air.
2. Power up the instrument by connecting the serial output to your PC USB port by
means of the special RS45 connection cable.
3. Wait for at least 15 minutes before proceeding.
4. Start DeltaLog14 program and follow the guided sensor calibration procedure.
HD45 / HD46 - 39 - V2.4
7. COMMUNICATION PROTOCOL
All models are supplied with a serial output with mini-USB connector, that allows you
to upload commands and to download data through your PC using communication
programs, such as – for example - Hyperterminal.
Connect the serial output located on the instrument side to a USB port of your PC via
the special RS45 or RS45I connection cable, which is supplied with a built-in USB
adaptor and mini-USB connector to the instrument end, and a USB connector to the
PC end. For a proper connection operation, it is necessary to install the drivers
included in the DeltaLog14 software package in your PC.
Attention: serial connection doesn’t work if the instrument is directly connected to the
PC via a standard mini-USB/USB adaptor cable.
After the connection, the instrument appears connected to a COM-type port.
Setup serial transmission parameters as follows:
Baud rate: 115200, Parity: None, Data bits: 8, Stop bits: 2
Please find below the list of configuration commands and data requests that can be
sent through a PC, with the instrument connected via mini-USB output:
Tab. 7.A: Communication protocol
Command Response Description
Cu0 &
Set the operating mode for circulating
air
Cu1 & Set the operating mode for still air
G0 HD… Transmitter model
G1 Vnn.nn aaaa/mm/gg Firmware version and date
G2 aaaa/mm/gg hh.mm.ss Calibration date and time
G3 nnnnnnnn Instrument serial number
G4 nnnnnnnn
Relative humidity module serial
number
G5 aaaa/mm/gg hh.mm.ss
Relative humidity module factory
calibration date and time
GS Download last logging session
GT Download all logging sessions
Gu
0
(still air mode) or
1
(circulating air mode)
Read if the operating mode is for still
or circulating air
PW nnnnnn Print number to retrieve access code
PWC nnnnnn nnnnnn & Set new “nnnnnn” access code
PWnnnnnn USER ENABLED!
Upload access code and set
authorization level “1”
PWX LOCKED! Set authorization level “0”
RLnnn n
Print authorization level of parameter
number “nnn”
RPnnn
Print value of parameter number
“nnn”
S0 & Disable measurement print
S1 & Single measurement print
S2 & Enable measurement continuous print
WLnnn x &
Set authorization level of parameter
number “nnn” to “x” value
WPnnn val &
Set parameter number “nnn” to “val”
value
HD45 / HD46 - 40 - V2.4
For the available parameter list, refer to Tab. 5.A (page 29).
In measurement continuous printing, values are the average computed on a number
of measurements equal to the number set for parameter P#002.
In models supplied also with a RS485 output, both serial outputs can be connected at
the same time, but the transmitters support only one communication channel at a
time. If mini-USB and RS485 outputs are both connected, the mini-USB
output prevails and the instrument replies only to commands sent via USB
connection and not to any commands sent on the RS485 line.
8. RS485 COMMUNICATION
HD45…S… and HD46…S… models are supplied with a RS485 serial output with
MODBUS-RTU protocol. RS485 connection is located in the instrument internal
terminal block (see section “CONNECTION AND INSTALLATION”) and is suitable for
fixed installations.
Thanks to RS485 output, several instruments can be connected to form a network,
consisting of a minimum of 1 instrument to a maximum of 247, connected in a
sequence through a shielded cable with twisted pair for signals and a third wire for
the common.
Fig. 8.A: Connection to RS485 network for HD45 and HD46 models
As shown in figure 8.A, resistors for impedance matching (line terminations) must be
set at the two network ends. To polarize the line during non-transmission periods,
resistors are connected between signal and power supply lines. Polarization resistors
are located in a single point of the line, generally near the “Master” unit.
The cable shield must be connected to both line ends.
The cable should have the following features:
RS232C / RS485
or
USB / RS485
Line
termination
Line
termination
HD45 / HD46 - 41 - V2.4
• Characteristic impedance: 120 ohm
• Capacity: less than 50pF/m
• Resistance: less than 100 ohm/km
• gauge: 0,22 mm
2
(AWG24) at least
If more than 32 devices have to be connected (that is, 31 instruments plus the Master
unit), place a signal repeater between a group and the next one. The line termination
must be connected at both ends of each segment.
The cable maximum length depends on baud rate and cable characteristics. Typically,
the maximum length is 1200m.
The data line must be kept separated from any power lines in order to prevent
interferences on the transmitted signal.
For connection to a PC, a RS232/RS485 or a USB/RS485 converter must be used.
Each transmitter placed on the network is univocally identified by an address, whose
value ranges within 1 and 247. Transmitters having the same address shall not
be present in the network, otherwise the “Master” unit will not be able to
communicate with these devices due to signal conflicts in the line.
The default communication parameters are as follows:
• Baud rate: 19200
• Parity: Even
• Start bit: 1
• Data bits: 8
• Stop bit: 1
Transmitter address, baud rate, parity type and stop bits number are configurable
parameters. See section “CONFIGURATION” for setup modes.
Note: communication via RS485 port is disabled if the instrument is connected to the
PC through the mini-USB output.
The DeltaLog14 software package includes utility files to make RS485 communication
easier, see guide “Utility program for RS485 connection” included in the package. The
following section describes the complete protocol.
8.1 MODBUS-RTU protocol
This protocol is “Master-Slave” type. The network includes only one “Master” device,
typically a PC, the other units, the transmitters, are all “Slave” type. The “Master” unit
can transmit commands and requests of data to the “Slave” devices on the network. A
“Slave” device communicates only with the “Master” unit following a request from the
latter. Direct communication between “Slave” devices is not allowed; additionally,
“Slave” devices cannot transmit data on the line if not requested.
Commands transmitted by a PC to the instrument consist of four fields:
Fig. 8.B: Data packet format in MODBUS-RTU protocol
Address
(1 byte)
Function
(1 byte)
Data
(0 to 252 bytes)
CRC
(2 bytes)
HD45 / HD46 - 42 - V2.4
• Address: address of the transmitter for command transmission.
Length = 1 byte
• Function: type of operation to be performed by the transmitter (for example, a
parameter setup).
Length = 1 byte
• Data: Data communicated to the transmitter (for example, a parameter
value). The field can be empty in case of commands that don’t involve
data transfer from PC to instrument.
Length = 0 to 252 bytes
• CRC: Data integrity control code (Cyclic Redundancy Code).
Length = 2 bytes
Each byte (8 bits) consists of two 4-bit hexadecimal characters.
Each byte is preceded by a start bit and followed by a parity bit plus a stop bit, for a
total of 11 bits.
Fig. 8.C: Byte format with parity bit in MODBUS-RTU protocol
If parity is not used, the byte must be followed by two stop bits.
Fig. 8.D: Byte format without parity bit in MODBUS-RTU protocol
The byte is transmitted starting from the least significant bit (LSB).
All bytes in a command are transmitted in a series with no interruptions, starting from
the address byte. The last byte to be transmitted is the most significant byte in the
control code (CRC). If two consecutive bytes are separated by a pause greater than
1.5 characters, the command will be considered as invalid and will be rejected by the
receiver.
There must be an interval of at least 3.5 characters between a command and the next
one.
Fig. 8.E: Frame sequence in MODBUS-RTU protocol
After a pause in the line greater than 3.5 characters, the connected devices will
consider the command transmission as terminated. The first received character after a
pause will be considered as the start of a new command.
Frame 1 Frame 2
Frame 3
At least
3.5 char.
At least
3.5 char.
3.5 char.
HD45 / HD46 - 43 - V2.4
After processing the received command, the instrument will send a response to the
PC, transmitting the requested data or only confirming the command execution if data
transfer has not been requested. The response structure is identical to that of the
message sent by the “Master” unit.
• Address: address of answering transmitter.
Length = 1 byte
• Function: type of operation performed by transmitter.
Length = 1 byte
• Data: Data communicated by transmitter to PC.
Length = 0 to 252 byte
• CRC: CRC Control code.
Length = 2 bytes
When value “0” is the address field, it means that the command has been sent to all
transmitters in the network. In this case, instruments execute the command but don’t
send any response to PC, in order to prevent transmission conflicts between
instruments. A command that is simultaneously sent to all instruments will be
therefore a parameter setup command, but not a request of data.
In order to prevent transmission conflicts between instruments, the PC shall also have
to wait for response from the questioned instrument before sending a new command.
If the instrument doesn’t receive a correct command (time intervals between
characters or control codes not respected), it will not reply to the PC. If the PC doesn’t
receive any response within a specified time interval (time-out), it will consider the
command receipt by the receiver as not successful and will try again the transmission
or will generate an error signal.
In appendix A, the CRC control code computing method is explained along with the
use of the parity bit.
Functions that can be requested by the PC to the instrument, with their codes to be
inserted in the command Function field, are described in the following table:
Tab. 8.A: MODBUS functions
Function code Function
01h Relay state reading
03h Configuration parameters reading
04h Measurements reading
05h Permanent storage of changed parameters
06h Single configuration parameter setup
07h Error conditions reading
10h Consecutive configuration parameter setup
2Bh Instrument general information reading
HD45 / HD46 - 44 - V2.4
Relays state reading (function 01h)
Function code 01h allows to read the relays activation state of the instrument.
The relays state can only be read, there are no commands available for relay state
modification.
The register address for the first relay state and the number of consecutive relays to
be read are indicated in the request data field.
Since registers are numbered starting from 1 in the protocol, and data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The instrument replies with a byte, whose least significant bit (LSB) indicates the
state of the first addressed relay, while the subsequent bits indicate the state of the
other requested relays. The bits value is 1 if relay is active and 0 if relay is inactive.
The bits following the last requested relay are set to 0 to complete the byte.
Consequently, the Function and Data fields of command and response will have the
following format:
Command
Value Length Description
Function: 01h 1 byte Relay state reading command
Data: 0000h to FFFFh 2 bytes First relay address
0001h to 007Dh 2 bytes Number of relays to be read (N)
Response
Value Length Description
Function: 01h 1 byte Relay state reading command
Data: 01h 1 byte Number of bytes with relay state
1 byte Relay state
The following table lists the available relays with their register number:
Tab. 8.B: Relays state registers
Register
number
Relay
From
FW Ver.
Notes
0004
Relay in HD45 models, whatever is the associated parameter
CO
2
relay in HD46 models
1.08
0005 Temperature relay in HD46 models 1.08
0006 Humidity relay in HD46 models 1.08
The state reading of the unavailable relays in that particular model is not allowed.
If the request involves the reading of at least one parameter which is not included in
table 8.B, the instrument will answer with the following error message:
Response
Value Length Description
Function: 81h 1 byte Error in relay state reading
Data: 02h 1 byte
Operation involved a non-existent
parameter (Tab. 8.F at page 59)
HD45 / HD46 - 45 - V2.4
Example:
You want to read the current state of the three relays in a HD46 17BR model, and
only the temperature relay is active:
You will have to include in the request:
• address (= number -1 ) of first relay register (0003 = 0003h)
• number of relays to be read (3 = 0003h).
Consequently, the command will have the following format:
Command
Value Length Description
Function: 01h 1 byte Relay state reading command
Data: 00h First relay address (MSB)
03h
2 bytes
First relay address (LSB)
00h Number of relays to be read (MSB)
03h
2 bytes
Number of relays to be read (LSB)
The instrument will answer as follows:
Response
Value Length Description
Function: 01h 1 byte Relay state reading command
Data: 01h 1 byte Number of bytes with relay state
02h 1 byte Relay state
The byte with the relay state is 02h = 0000 0010. The least significant bit corresponds
to the C0
2
relay state (0 = disabled), the second bit corresponds to the temperature
relay (1 = enabled), the third bit corresponds to the humidity relay (0 = disabled).
Configuration parameters reading (function 03h)
Function code 03h allows to read a specified number of consecutive instrument
parameters.
The configuration register address containing the first parameter to be read and the
number of parameters to be read are indicated in the request data field.
Since, in the protocol, registers are numbered starting from 1, and data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The instrument replies with the value of the requested parameters. Consequently, the
Function and Data fields of command and Response will have the following format:
Command
Value Length Description
Function: 03h 1 byte Parameters reading command
Data: 0000h to FFFFh 2 bytes First parameter address
0001h to 007Dh 2 bytes Number of parameters to be read (N)
HD45 / HD46 - 46 - V2.4
Response
Value Length Description
Function: 03h 1 byte Parameters reading command
Data: 2 x N 1 byte Number of bytes for the values
2 x N bytes Parameters values
A parameter value is stored in a 16-bit register and consequently requires always a
2-byte length. The most significant byte precedes the least significant one.
The following table lists the available parameters with their register number.
Tab. 8.C: Configuration registers
Register
number
Parameter Format
From
FW Ver.
Notes
0001 P#000 User code - character 1 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0002 P#000 User code - character 2 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0003 P#000 User code - character 3 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0004 P#000 User code - character 4 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0005 P#000 User code - character 5 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0006 P#000 User code - character 6 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0007 P#000 User code - character 7 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0008 P#000 User code - character 8 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0009 P#000 User code - character 9 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0010 P#000 User code - character 10 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0011 P#000 User code - character 11 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0012 P#000 User code - character 12 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0013 P#000 User code - character 13 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0014 P#000 User code - character 14 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0015 P#000 User code - character 15 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0016 P#000 User code - character 16 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0017 P#000 User code - character 17 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0018 P#000 User code - character 18 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0019 P#000 User code - character 19 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0020 P#000 User code - character 20 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0021 P#000 User code - character 21 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0022 P#000 User code - character 22 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0023 P#000 User code - character 23 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0024 P#000 User code - character 24 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0025 P#000 User code - character 25 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0026 P#000 User code - character 26 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0027 P#000 User code - character 27 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0028 P#000 User code - character 28 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0029 P#000 User code - character 29 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0030 P#000 User code - character 30 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0031 P#000 User code - character 31 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0032 P#000 User code - character 32 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0033 P#000 User code - character 33 (ASCII)
8 bits (LSB) 1.00
(1),(2)
0034 P#000 User code - character 34 (ASCII) 8 bits (LSB) 1.00
(1),(2)
0035 P#001 User calibration - seconds 8 bits (LSB) 1.00
(1),(2)
0036 P#001 User calibration - minutes 8 bits (LSB) 1.00
(1),(2)
0037 P#001 User calibration - hours 8 bits (LSB) 1.00
(1),(2)
0038 P#001 User calibration - day 8 bits (LSB) 1.00
(1),(2)
0039 P#001 User calibration - month 8 bits (LSB) 1.00
(1),(2)
0040 P#001 User calibration - year 8 bits (LSB) 1.00
(1),(2)
0041 P#002 Number of samples to be averaged for
measurement print on serial port
16 bits
unsigned
1.00
HD45 / HD46 - 47 - V2.4
Register
number
Parameter Format
From
FW Ver.
Notes
0042 P#003 Reference CO2 [ppm] Int 16 bits 1.00
0043 P#004 Atmospheric pressure [hPa] Int 16 bits 1.00
0044 P#005 Logging interval 8 bits (LSB) 1.00
(2)
0045 P#006 Temperature measurement unit 8 bits (LSB) 1.00
(2)
0046 P#007 Humidity measurement unit 8 bits (LSB) 1.00
(2)
0047 P#008 CO2 analog output configuration 8 bits (LSB) 1.00
(2)
0048 P#009 Temp. analog output configuration 8 bits (LSB) 1.00
(2)
0049 P#010 Humidity analog output configuration 8 bits (LSB) 1.00
(2)
0050 P#011 Min. temperature in °C at analog output
minimum scale (x10)
Int 16 bits 1.00
0051 P#012 Temperature in °C at analog output
minimum scale (x10)
Int 16 bits 1.00
0052 P#013 Temperature in °C at 10V or 20mA (x10) Int 16 bits 1.00
0053 P#014 Max. temperature (°C) at 10V or 20mA
(x10)
Int 16 bits 1.00
0054 P#015 Minimum temperature range in °C for the
analog output (x10)
Int 16 bits 1.00
0055 P#016 Min. temperature in °F at analog output
minimum scale (x10)
Int 16 bits 1.00
0056 P#017 Temperature in °F at analog output
minimum scale (x10)
Int 16 bits 1.00
0057 P#018 Temperature in °F at 10V or 20mA (x10) Int 16 bits 1.00
0058 P#019 Max. temperature in °F at 10V or 20mA
(x10)
Int 16 bits 1.00
0059 P#020 Minimum temperature range in °F for the
analog output (x10)
Int 16 bits 1.00
0060 P#021 Min. RH% at analog output minimum
scale (x10)
Int 16 bits 1.00
0061 P#022 RH% at analog output minimum scale
(x10)
Int 16 bits 1.00
0062 P#023 RH% at 10V or 20mA (x10) Int 16 bits 1.00
0063 P#024 Max. RH% at 10V or 20mA (x10) Int 16 bits 1.00
0064 P#025 RH% minimum range for the analog
output (x10)
Int 16 bits 1.00
0065 P#026 Min. Td (°C) at analog output minimum
scale (x10)
Int 16 bits 1.00
0066 P#027 Td (°C) at analog output minimum scale
(x10)
Int 16 bits 1.00
0067 P#028 Td (°C) at 10V or 20mA (x10) Int 16 bits 1.00
0068 P#029 Max. Td (°C) at 10V or 20mA (x10) Int 16 bits 1.00
0069 P#030 Td (°C) minimum range for the analog
output (x10)
Int 16 bits 1.00
0070 P#031 Min. (Ta-Td) in °C at analog output
minimum scale (x10)
Int 16 bits 1.00
0071 P#032 (Ta-Td) in °C at analog output minimum
scale (x10)
Int 16 bits 1.00
0072 P#033 (Ta-Td) in °C at 10V or 20mA (x10) Int 16 bits 1.00
0073 P#034 Max. (Ta-Td) in °C at 10V or 20mA (x10) Int 16 bits 1.00
0074 P#035 (Ta-Td) minimum range in °C for the
analog output (x10)
Int 16 bits 1.00
0075 P#036 Min. CO2 (ppm) at analog output
minimum scale
Int 16 bits 1.00
HD45 / HD46 - 48 - V2.4
Register
number
Parameter Format
From
FW Ver.
Notes
0076 P#037 CO2 (ppm) at analog output minimum
scale
Int 16 bits 1.00
0077 P#038 CO2 (ppm) at 10V or 20mA Int 16 bits 1.00
0078 P#039 Max. CO2 (ppm) at 10V or 20mA Int 16 bits 1.00
0079 P#040 CO2 minimum range in ppm for the analog
output
Int 16 bits 1.00
0080 P#041 Relay mode in HD45 and CO2 relay mode
in HD46 with simplified mode disabled
8 bits (LSB) 1.00
(2)
0081 P#042 Temp. relay operation mode in HD46 with
simplified mode disabled
8 bits (LSB) 1.00
(2)
0082 P#043 Humidity relay operation mode in HD46
with simplified mode disabled
8 bits (LSB) 1.00
(2)
0083 P#044 HD45 relay and HD46 CO2 relay thresh. B Int 16 bits 1.00
0084 P#045 HD46 temp. relay threshold B Int 16 bits 1.00
0085 P#046 HD46 humidity relay threshold B Int 16 bits 1.00
0086 P#047 HD45 relay and HD46 CO2 relay thresh. A Int 16 bits 1.00
0087 P#048 HD46 temp. relay threshold A Int 16 bits 1.00
0088 P#049 HD46 humidity relay threshold A Int 16 bits 1.00
0089 P#050 HD45 relay and HD46 CO2 relay hysteresis
(In HD45 models, it is the hysteresis when
rotary switch is in position 0)
Int 16 bits 1.00
0090 P#051 Temperature relay hysteresis in HD46 Int 16 bits 1.00
0091 P#052 Humidity relay hysteresis in HD46 Int 16 bits 1.00
0092 P#053 Relay assignment for HD45…R models 8 bits (LSB) 1.03
(2)
0093 P#054 Lower threshold (ppm) for HD45 BVR and
HD45
BAR LED indicators
Int 16 bits 1.03
0094 P#055 Medium threshold (ppm) for HD45 BVR
and HD45
BAR LED indicators
Int 16 bits 1.03
0095 P#056 Upper threshold (ppm) for HD45 BVR and
HD45
BAR LED indicators
Int 16 bits 1.03
0096 P#057 Threshold hysteresis (ppm) for HD45 BVR
and HD45
BAR LED indicators
Int 16 bits 1.03
0097 P#058 RS485 address 8 bits (LSB) 1.00
(2)
0098 P#059 RS485 Baud Rate 8 bits (LSB) 1.00
(2)
0099 P#060 RS485 transmission mode 8 bits (LSB) 1.00
(2)
0100 P#061 RS485 receiving mode 8 bits (LSB) 1.00
(2)
0101 P#082 Rotary switch threshold 1 with relay
associated with temp. or humidity (x10)
Int 16 bits 1.07
0102 P#083 Rotary switch 2 to 9 positions increment
with relay associated with temperature or
humidity (x10)
16 bit
unsigned
1.07
0103 P#084 Relay hysteresis with rotary switch in
position other than 0 (x10 if associated
with temperature or humidity)
16 bits
unsigned
1.07
0104 P#062 Relay mode in HD45 models with rotary
switch in position other than 0.
8 bits (LSB) 1.07
(2)
0105 P#063 Relay simplified mode enabling in HD46
models
8 bits (LSB) 1.07
(2)
0106 P#064 CO2 relay operation mode in HD46 with
simplified mode enabled
8 bits (LSB) 1.07
(2)
0107 P#065 Temp. relay operation mode in HD46
models with simplified mode enabled
8 bits (LSB) 1.07
(2)
HD45 / HD46 - 49 - V2.4
Register
number
Parameter Format
From
FW Ver.
Notes
0108 P#066 Humidity relay operation mode in HD46
models with simplified mode enabled
8 bits (LSB) 1.07
(2)
0109 P#085 CO2 relay threshold (ppm) in HD46
models with simplified mode enabled
Int 16 bits 1.07
0110 P#086 Temp. relay threshold (X10) in HD46
models with simplified mode enabled
Int 16 bits 1.07
0111 P#087 Humidity relay threshold (X10) in HD46
models with simplified mode enabled
Int 16 bits 1.07
0112 P#088 Minimum possible threshold in ppm for
CO
2
relay in HD46 models with simplified
mode enabled
Int 16 bits 1.07
0113 P#089 Minimum possible threshold (x10) for
temperature relay in HD46 models with
simplified mode enabled
Int 16 bits 1.07
0114 P#090 Minimum possible threshold (x10) for
humidity relay in HD46 models with
simplified mode enabled
Int 16 bits 1.07
0115 P#091 Maximum possible threshold in ppm for
CO
2
relay in HD46 models with simplified
mode enabled
Int 16 bits 1.07
0116 P#092 Maximum possible threshold for temp.
relay in HD46 models with simplified
mode enabled
Int 16 bits 1.07
0117 P#093 Maximum possible threshold for humidity
relay in HD46 models with simplified
mode enabled
Int 16 bits 1.07
10001 Access code – character 1 (ASCII)
8 bits (LSB) 1.00
(2),(3)
10002 Access code – character 2 (ASCII)
8 bits (LSB) 1.00
(2),(3)
10003 Access code – character 3 (ASCII)
8 bits (LSB) 1.00
(2),(3)
10004 Access code – character 4 (ASCII)
8 bits (LSB) 1.00
(2),(3)
10005 Access code – character 5 (ASCII)
8 bits (LSB) 1.00
(2),(3)
10006 Access code – character 6 (ASCII)
8 bits (LSB) 1.00
(2),(3)
(1) Read only.
(2) “8 bits (LSB)” indicates register least significant byte.
(3) The reading of an access code register doesn’t show the code character, but value 1, if the code is
active, or value 0 if the code is inactive. In writing, registers are used only for the temporary storing of
the characters sent by the user. Registers are not used to change the access code. It is not possible to
change the access code stored in the instrument through RS485. The instrument verifies the access
code correspondence after each written character.
Please note that the parameter address to be included in the command doesn’t match
the parameter number that appears in the menu of the instruments with keyboard or
that can be set through USB connection, as it can be observed in the table above.
Please refer to Table 5.A. for the values that can be assigned to parameters.
If the request involves the reading of at least one parameter that is not included in
Table 8.C, the instrument generates the following error message:
Response
Value Length Description
Function: 83h 1 byte Error in parameters reading
Data: 02h 1 byte
Operation involved an inexistent
parameter (Tab. 8.F at page 59)
HD45 / HD46 - 50 - V2.4
Example:
Let’s take into account an instrument having the following settings for the relative
humidity analog output: 0V = 20.0% RH ; 10V = 80.0% RH.
From Table 8.C we obtain that the two parameters are stored in registers number
0061 and 0062, respectively. In order to read the two parameters values, the
following shall be included in the request:
• address (= number - 1) of register with first parameter (0060 = 003Ch)
• number of parameters to be read (2 = 0002h).
Consequently, the command assumes the following format:
Command
Value Length Description
Function: 03h 1 byte Parameters reading command
Data: 00h First parameter address (MSB)
3Ch
2 bytes
First parameter address (LSB)
00h Number of parameters to be read (MSB)
02h
2 bytes
Number of parameters to be read (LSB)
The instrument answers with the two parameter values: 20.0% x 10 = 200 = 00C8h
80.0% x 10 = 800 = 0320h
Response
Value Length Description
Function: 03h 1 byte Parameters reading command
Data: 04h 1 byte Number of bytes for the values
00h RH% value at 0V (MSB)
C8h
2 bytes
RH% value at 0V (LSB)
03h RH% value at 10V (MSB)
20h
2 bytes
RH% value at 10V (LSB)
HD45 / HD46 - 51 - V2.4
Measurements reading (function 04h)
Function code 04h allows to read the values measured by the instrument.
The input register address containing the first quantity and the number of consecutive
quantities to be read are indicated in the request data field.
Since, in the protocol, registers are numbered starting from 1, but data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The instrument replies with the value of the requested quantities. It is not allowed to
read quantities that are not measured by the instrument model.
Consequently, the Function and Data fields of command and response assume the
following format:
Command
Value Length Description
Function: 04h 1 byte Measurements reading command
Data: 0000h to FFFFh 2 bytes First quantity address
0001h to 007Dh 2 bytes Number of quantities to be read (N)
Response
Value Length Description
Function: 04h 1 byte Measurements reading command
Data: 2 x N 1 byte Number of bytes for the values
2 x N bytes Measurements values
A measurement value is stored in a 16-bit register and consequently always requires
a 2-byte length. The most significant byte precedes the least significant one.
The following table lists the available quantities with their register number.
Tab. 8.D: Input registers
Register
number
Quantity Format
From
FW Ver.
Notes
0001 Temperature in °C (x10)
16 bits 1.00
0002 Temperature in °F (x10)
16 bits 1.00
0003 Relative humidity in % (x10)
16 bits unsigned 1.00
0004 Dewpoint in °C (x10)
16 bits unsigned 1.00
0005 CO2 in ppm 16 bits unsigned 1.00
If the request involves the reading of at least one parameter that is not included in
Table 8.D, the instrument will answer with the following error message:
Response
Value Length Description
Function: 84h 1 byte Error in measurements reading
Data: 02h 1 byte
Operation involved an inexistent
parameter (Tab. 8.F page 59)
HD45 / HD46 - 52 - V2.4
Example:
You may want to read the relative humidity measurement of a transmitter whose
current measure is 65.8%.
From Table 8.D we obtain that the relative humidity value is stored in register number
0003. In order to read the quantity value, you need to include in the request:
• address (= number - 1) of register with the first parameter (0002 = 0002h)
• number of parameters to be read (1 = 0001h).
Consequently, the command assumes the following format:
Command
Value Length Description
Function: 04h 1 byte Measurements reading command
Data: 00h First quantity address (MSB)
02h
2 bytes
First quantity address (LSB)
00h Number of quantities to be read (MSB)
01h
2 bytes
Number of quantities to be read (LSB)
The instrument will answer with the measured value: 65.8% x 10 = 658 = 0292h
Response
Value Length Description
Function: 04h 1 byte Measurements reading command
Data: 02h 1 byte Number of bytes for the values
02h Measured RH% value (MSB)
92h
2 bytes
Measured RH% value (LSB)
HD45 / HD46 - 53 - V2.4
Parameter storage (function 05h)
Function code 05h allows the permanent storage of any changes made to parameter
values. Parameter changes performed with Write functions (functions 06h
and 10h) actually modify only values in the RAM memory and are therefore
deleted in case of instrument power supply failure.
Storage is associated with a number, as described in Table 8.E.
Tab. 8.E: Storage command
Command
number
Command
From
FW Ver.
Notes
0003 Parameter permanent storage 1.07
The command address, followed by the fixed value FF00h is indicated in the request
data field.
Since, in the protocol, registers are numbered starting from 1, but data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The response format of the instrument is equal to the request format. Therefore,
command and response Function and Data fields have the following format:
Command
Value Length Description
Function: 05h 1 byte Commands execution
Data: 0002h 2 bytes Command address (= number - 1)
FF00h 2 bytes Fixed value
Response
Value Length Description
Function: 05h 1 byte Commands execution
Data: 0002h 2 bytes Command address (= number - 1)
FF00h 2 bytes Fixed value
Only parameters changed within command transmission are permanently stored, any
changes made afterwards require a new transmission of the command in order to
make them become permanent.
The execution request of a command that is not present in table 8.E generates an
error response from the instrument.
Changing a single configuration parameter (function 06h)
Function code 06h allows to change a single parameter value in the instrument.
The configuration register address containing the parameter to be changed and the
new parameter value are indicated in the request data field.
Since, in the protocol, registers are numbered starting from 1, but data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The response format of the instrument is equal to the request format. Therefore,
command and response Function and Data fields have the following format:
HD45 / HD46 - 54 - V2.4
Command
Value Length Description
Function: 06h 1 byte Parameter write command
Data: 0000h to FFFFh 2 bytes Parameter address
0000h to FFFFh 2 bytes New parameter value
Response
Value Length Description
Function: 06h 1 byte Parameter write command
Data: 0000h to FFFFh 2 bytes Parameter address
0000h to FFFFh 2 bytes New parameter value
A parameter value is stored in a 16-bit register and always requires, therefore, a
2-byte length. The most significant byte precedes the least significant one.
Table 8.C (page 46) lists all available parameters with their register number.
T
he write 06h function changes only the value in the RAM memory, the
change is therefore cancelled in case of power supply failure in the
instrument. To make any parameter changes permanent, the “Parameter permanent
storage” command shall follow the parameter change (function 05h).
To change parameters protected by an access code, you must first write the code in
the configuration registers from address 10000 to 10005. After changing the
parameters, modify the content of the above mentioned registers to disable the code.
If the request involves writing a parameter not included in Table 8.C, the instrument
replies with the following error message:
Response
Value Length Description
Function: 86h 1 byte Error in parameter writing
Data: 02h 1 byte
Operation involved a non-existent
parameter (Tab. 8.F page 59)
Changing several consecutive configuration parameters (function 10h)
Function code 10h allows to change the value of several parameters with the same
command, provided that parameters are included in consecutive registers.
The first configuration register address and the number of consecutive parameters to
be changed, along with the number of bytes with the new values and the new
parameter values are indicated in the request data field.
Since, in the protocol, registers are numbered starting from 1, but data are addressed
starting from 0, a register address is equal to the register number decremented by 1.
The instrument response contains the address of the first modified register and the
number of modified consecutive registers.
Therefore, command and Response Function and Data fields have the following
format:
HD45 / HD46 - 55 - V2.4
Command
Value Length Description
Function: 10h 1 byte Parameters writing command
Data: 0000h to FFFFh 2 bytes First parameter address
0001h to 007Bh 2 bytes Number of parameters to be changed (N)
2 x N 1 byte Number of bytes
2 x N bytes New parameters values
Response
Value Length Description
Function: 10h 1 byte Parameters writing command
Data: 0000h to FFFFh 2 bytes First parameter address
0001h to 007Bh 2 bytes Number of changed parameters (N)
A parameter value is stored in a 16-bit register and always requires, therefore, a
2-byte length. The most significant byte precedes the least significant one.
Table 8.C (page 46) lists all available parameters with their register number.
T
he write function 10h changes only the value in the RAM memory; changes
are therefore deleted in case of power supply failure in the instrument. To
make any parameter changes permanent, “Parameter permanent storage” command
shall follow the parameter change (function 05h).
To change parameters protected by an access code, you must first write the code in
the configuration registers from number 10000 to 10005. After changing the
parameters, modify the content of the above mentioned registers to disable the code.
If the request involves entering a parameter not included in Table 8.C, the instrument
replies with the following error message:
Response
Value Length Description
Function: 90h 1 byte Error in parameters writing
Data: 02h 1 byte
Operation involved a non-existent
parameter (Tab. 8.F page 59)
Example:
Suppose you want to change CO
2
values corresponding to the initial and full scale
values:
• 0V or 4mA = 350 ppm
• 10V or 20mA = 1200 ppm.
The two parameters are protected by the access code “240471”.
In order to change the parameters, the access code has to be transmitted first by
means of the command below:
HD45 / HD46 - 56 - V2.4
Command
Value Length Description
Function: 10h 1 byte Parameters write command
Data: 27h Address of 1
st
code char. (MSB)
10h
2 bytes
Address of 1
st
code char. (LSB)
00h 6 parameters to be written (MSB)
06h
2 bytes
6 parameters to be written (LSB)
0Ch 1 bytes 12 bytes of values
00h 1st character value (MSB)
02h
2 bytes
1st character value (LSB)
00h 2
nd
character value (MSB)
04h
2 bytes
2
nd
character value (LSB)
00h 3
rd
character value (MSB)
00h
2 bytes
3
rd
character value (LSB)
00h 4
th
character value (MSB)
04h
2 bytes
4
th
character value (LSB)
00h 5
th
character value (MSB)
07h
2 bytes
5
th
character value (LSB)
00h 6
th
character value (MSB)
01h
2 bytes
6
th
character value (LSB)
The instrument replies by:
Response
Value Length Description
Function: 10h 1 byte Parameters write command
Data: 27h Address of the 1
st
code char .(MSB)
10h
2 bytes
Address of the 1
st
code char. (LSB)
00h 6 parameters written (MSB)
06h
2 bytes
6 parameters written (LSB)
The instrument compares the written access code with the one stored in the internal
memory; if they are equal, it allows parameter change.
From Table 8.C, we obtain that the initial and full scale values for the CO
2
analog
output are stored in registers number 0076 and 0077 respectively. In order to write
the two parameters values, the request will have to include:
• address (= number - 1) of 1
st
parameter register (0075 = 004Bh)
• number of parameters to change (2 = 0002h)
• number of bytes for the values (4 = 04h)
• values to be written (350 = 015Eh, 1200 = 04B0h)
Consequently, the command format will be:
HD45 / HD46 - 57 - V2.4
Command
Value Length Description
Function: 10h 1 byte Parameters write command
Data: 00h Address of 1
st
parameter(MSB)
4Bh
2 bytes
Address of 1
st
parameter (LSB)
00h Number of parameters to write (MSB)
02h
2 bytes
Number of parameters to write (LSB)
04h 1 byte Number of bytes for the values
01h Value at 0V or 4mA = 350 ppm (MSB)
5Eh
2 bytes
Value at 0V or 4mA = 350 ppm (LSB)
04h Value at 10V or 20mA = 1200 ppm (MSB)
B0h
2 bytes
Value at 10V or 20mA = 1200 ppm (LSB)
The instrument will answer as follows:
Response
Value Length Description
Function: 10h 1 byte Parameters write command
Data: 00h Address of 1
st
parameter (MSB)
4Bh
2 bytes
Address of 1
st
parameter (LSB)
00h Number of parameters to write (MSB)
02h
2 bytes
Number of parameters to write (LSB)
For permanent storage of changes, transmit the command below:
Command
Value Length Description
Function: 05h 1 byte Commands execution
Data: 0002h 2 bytes Permanent storage command address
FF00h 2 bytes Fixed value
At the end, parameters can be protected again from undesired alterations by sending
a different access code than the one stored in the internal memory.
Instrument error conditions (function 07h)
Function code 07h allows to read the 8-bit register containing information about any
error conditions that may occur.
Each register bit corresponds to an error condition:
• Bit 0: humidity module EEPROM doesn’t answer;
• Bit 1: humidity module EEPROM contains incorrect data;
• Bit 2: Relative humidity sensor calibration data not available;
• Bit 3: Calibration and configuration data memory is altered;
• Bit 4: Program memory altered;
• Bit 5: Temperature calibration error;
• Bit 6: Temperature measurement out of scale;
• Bit 7: Relative humidity measurement out of scale.
HD45 / HD46 - 58 - V2.4
There is error condition if relevant bit is 1.
The command for the errors register reading is:
Command
Value Length Description
Function: 07h 1 byte Errors register reading command
Data: 0 byte Data field is empty
The instrument answers as follows:
Response
Value Length Description
Function: 07h 1 byte Errors register reading command
Data: 00h to FFh 1 byte Register value
Instrument general information reading (function 2Bh)
Function code 2Bh allows to read the instrument basic general information, including:
• Manufacturer;
• Instrument model;
• Firmware version.
The command format will be as follows:
Command
Value Length Description
Function: 2Bh 1 byte Information reading command
Data: 0Eh 1 byte
Fixed value
(MEI type - Modbus Encapsulated Interface)
01h 1 byte
Fixed value
(Identification type - basic)
00h 1 byte
Fixed value
(First information field)
The instrument will answer as follows:
Response
Value Length Description
Function: 2Bh 1 byte Information reading command
Data: 0Eh 1 byte
Fixed value
(MEI type - Modbus Encapsulated Interface)
01h 1 byte
Fixed value
(Identification type - basic)
01h 1 byte
Fixed value
(Conformity level – basic – fields cannot be
individually accessed)
(continues…) 00h 1 byte
Fixed value
(No other fields available)
HD45 / HD46 - 59 - V2.4
Value Length Description
(continues…) 00h 1 byte
Fixed value
(next item ID)
03h 1 byte
Fixed value
(Number of fields)
00h 1 byte
Fixed value
(first field ID)
Length 1 1 byte First field length
Value 1 (Length 1) bytes First field value (Manufacturer)
01h 1 byte
Fixed value
(second field ID)
Length 2 1 byte Second field length
Value 2 (Length 2) bytes Second field value (Model)
02h 1 byte
Fixed value
(Third field ID)
Length 3 1 byte Third field length
Value 3 (Length 3) byte Third field value (Firmware version)
Error responses
Commands correctly addressed and passing the CRC control can anyway generate
error conditions, for example, if you try to read a non-existent parameter or if you ask
the instrument to perform a function which is not compatible with the model.
In all cases where the instrument is not able to complete – for any reason – the
requested action, a response is generated containing an error code. The value entered
in the Function field corresponds to the received Function code with the most
significant bit (MSB) set to 1, in order to inform the “Master” unit about either the
error condition and the function that generated the error.
Response
Value Length Description
Function:
Requested function code
with MSB=1
1 byte
Error in requested function
execution
Data: 01h to 03h 1 byte Error type (Table 8.F)
The table below describes the error codes:
Tab. 8.F: Error codes
Error
code
Error
From
FW Ver.
Notes
0001 Invalid function.
The instrument doesn’t manage the requested function.
1.00
0002 Invalid address.
At least one of the registers specified in the command does
not exist.
1.00
0003 Invalid data.
Data length doesn’t correspond to register length or value
out of acceptable range.
1.00
Further details relating to MODBUS protocol may be consulted at “www.modbus.org”.
HD45 / HD46 - 60 - V2.4
9. TECHNICAL SPECIFICATIONS
Sensor features
Relative humidity RH (for HD45 17…, HD46 17… and HD46 17B… models)
Sensor Capacitive
Measuring range 0...100 % RH
-40…+85°C Dewpoint Td
Sensor operating range -40...+80°C
Accuracy ±2.5% (0…85%RH)/±3.5% (85…100%RH)
@ T=15…35°C and air speed < 0.25 m/s
(*)
(2.5 + 1.5% reading)% @ T= remaining range
See table for Dewpoint
Resolution 0,1%
Temperature influence 2% over the whole temperature range
Hysteresis and repeatability 1% RH
Response time (T90) <20 sec.
(air speed = 2m/sec and constant temperature)
Long-term stability 1%/year
(*)
The instruments are preset to operate in still air. To operate in circulating air (e.g. in a climatic
room), the operating mode of the instruments must be changed (see the commands on pag. 39).
Temperature T (for HD45 17…, HD45 7B…, HD46 17… and HD46 17B… models)
Sensor type NTC 10KΩ
Measuring range -30...+85°C (-22…+185°F)
Accuracy
(except models with current output)
±0.2°C ±0.15% of reading within 0…70°C
±0.3°C ±0.15% of reading within -30…0°C, 70…85°C
Accuracy
(for models with current output)
±0.5°C ±0.15% of reading within -30…+85°C
Resolution 0.1°C
Response time (T90) <30 sec. (air speed = 2m/sec)
Long-term stability 0.1°C/year
Carbon Dioxide CO2 (for HD45 7B…, HD45 B… and HD46 17B… models)
Sensor NDIR double wavelength
Range 0…5000 ppm
Sensor operating range -5…50°C
Accuracy ±(50ppm+3% of reading) @ 20°C and 1013hPa
Resolution 1ppm
Temperature influence 0.1%f.s./°C
Response time (T90) <120 sec.
(air speed = 2m/sec and constant temperature )
Long-term stability 5% of measure/5 years
HD45 / HD46 - 61 - V2.4
Dewpoint Td accuracy (°C)
The dewpoint is a computed quantity that depends on relative humidity and
temperature calibration accuracy. The values supplied below refer to ±2.5%RH,
±0.25°C, 1013.25mbar accuracies.
Relative humidity (%)
10 30 50 70 90 100
-20 2.50 1.00 0.71 0.58 -- --
0 2.84 1.11 0.78 0.64 0.56 0.50
20 3.34 1.32 0.92 0.75 0.64 0.62
50 4.16 1.64 1.12 0.90 0.77 0.74
Temperature °C)
100 5.28 2.07 1.42 1.13 0.97 0.91
Instrument features
Measuring frequency 1 sample every 3 seconds
Memory size 2304 Records
Logging interval Selectable between: 30s, 1m and 5m
The stored values represent the average values of the
sam
p
les acquired every 3 seconds in the selected logging
interval.
Serial outputs mini-USB (mini-USB / USB cable RS45 or RS45I cod.)
RS485 MODBUS-RTU (HD45…S… and HD46…S… only)
Stored data security Unlimited
Analog outputs 0…10Vdc (RL > 10kΩ) (HD45…V… and HD46…V only)
11Vdc out of range
4…20mA (R
L MAX
= 400Ω) (HD45…A… and HD46…A only)
22mA outside the measuring range
Active sourcing current output
Relay outputs Bistable relay (HD45…R and HD46…R only)
Contact: max 1A @ 30Vdc resistive load
Power supply 24Vac ± 10% (50…60Hz) or 15…35Vdc
Power consumption 100 mW (except models with current output)
400 mW (for models with current output)
Stabilization time at switch-on 15 minutes (to ensure declared accuracy)
Instrument operating
temperature
0°C ... 50°C
Operating relative humidity 0%RH ... 95%RH non-condensing
Dimensions
(LxHxW)
80 x 80 x 30 mm (HD45.17…)
80 x 80 x 34 mm (HD45.B… and HD45.7B…)
120 x 80 x 30 mm (HD46.17…)
120 x 80 x 34 mm (HD46.17B…)
Weight 50 g
Housing material ABS
HD45 / HD46 - 62 - V2.4
Dimensions (in mm)
HD45… series
HD46… series
HD45 / HD46 - 63 - V2.4
Fixing holes
HD45 / HD46 - 64 - V2.4
Instrument storage conditions
Temperature: -25...+70°C.
• Humidity: 10...90%RH non-condensing.
• In storing the instrument, avoid areas where:
There is a high humidity level.
The instrument is exposed to direct sunlight.
The instrument is exposed to a high temperature source.
There are high vibration levels.
There is presence of vapour, salt and/or corrosive gas.
Cleaning
The instrument housing is in ABS plastic material: do not use solvents that are not
compatible with cleaning purposes.
Authorized use
Observe the technical specifications indicated in this chapter. Only the use and
operation of this instrument in accordance with the instructions given in this manual
are authorized. Any other use is to be considered as not authorized.
General safety instructions
This instrument has been manufactured and tested in accordance with EN61010-1
safety directives for electronic measuring instruments and has left the factory in
perfect safety technical conditions.
The instrument proper operation and operating safety can be ensured only if all
standard safety measures as well as the specific measures described in this manual
are followed.
The instrument proper operation and operating safety can be ensured only in the
climatic conditions specified in this manual.
Do not use the instrument in places where there are:
• Rapid ambient temperature variations that may cause condensation.
• Corrosive or flammable gases.
• Direct vibrations or bumps to the instrument.
• High-intensity electromagnetic fields, static electricity.
If the instrument is moved from a cold place to a hot one, or vice versa, condensation
formation can cause instrument malfunction. In this case, you will have to wait for the
instrument temperature to reach ambient temperature level before turning the
instrument on.
User obligations
The instrument operator shall follow the directives and regulations below that refer to
hazardous materials treatment :
EEC directives on workplace safety
National law regulations on workplace safety
Accident prevention regulations
HD45 / HD46 - 65 - V2.4
10. ORDERING CODES
HD45
V = 0÷10Vdc analog output
A = 4÷20mA analog output
S = RS485 MODBUS-RTU output
R = Relay output
VR = 0÷10Vdc analog output and relay
AR = 4÷20mA analog output and relay
SR = RS485 MODBUS-RTU output and relay
If there is the analog output, there cannot be the
RS485 output and vice versa.
D = With display
No characters = Without display
Sensors
17 = Humidity and temperature
7B = Temperature and CO
2
B = CO
2
HD46
V = 0÷10Vdc analog outputs
A = 4÷20mA analog outputs
S = RS485 MODBUS-RTU output
R = Relay outputs
SR = RS485 MODBUS-RTU output and relay
outputs
If there is the analog output, there cannot be the
RS485 output and vice versa.
With V or A option, there is an analog output for each
measured quantity.
With R and SR options, there is a relay output for each
measured quantity.
D = With display
DT = With display and keyboard
No characters = Without display and
keybord
DT option is available only with R or SR options.
Sensors
17 = Humidity and temperature
17B = Humidity, temperature and CO
2
AVAILABLE OPTIONS
AVAILABLE OPTIONS
HD45 / HD46 - 66 - V2.4
Examples:
HD45 7BDVR: Transmitter, indicator and regulator for temperature and CO2. With
display, two 0÷10V analog outputs, a relay configurable for temperature or CO
2
control.
HD45
BVR: Transmitter, indicator and regulator for CO
2
. Without display, with CO
2
level LED indicators, with 0÷10V analog output and relay.
HD45
17AR: Transmitter and regulator for temperature and humidity. Without
display, with two 4÷20mA analog outputs, a relay configurable for temperature or
humidity control.
HD45
17DV: Transmitter and indicator for temperature and humidity. With display,
two 0÷10V analog outputs, without relay.
HD45
7BSR: Transmitter and regulator for temperature and CO
2
. Without display,
with RS485 output, without analog output, with a relay configurable for
temperature or CO
2
control.
HD46
17BDV: Transmitter and indicator for temperature, humidity and CO
2
. With
display, without keyboard, with three 0÷10V analog outputs, without relay and
without RS485 output.
HD46
17BDTSR: Transmitter, indicator and regulator for temperature, humidity and
CO
2
. With display and keyboard, with three relay outputs, with RS485 output.
HD46
17S: Temperature and humidity transmitter. Without display and keyboard, no
relays, with RS485 output.
Accessories:
DeltaLog14: Software for connection to a PC through serial port with mini-USB
connector, instrument configuration and data download. For Windows
®
operating
systems.
HDM46: Calibrated relative humidity and temperature replacement module (for
HD46…models only).
RS45: Not isolated serial connection cable with built-in adapter. USB connector to PC
and mini-USB connector to instrument serial port. The instrument is powered by
the PC through the cable (at least a 500 mA USB port is required).
RS45I: Isolated serial connection cable with built-in adapter. USB connector to PC
and mini-USB connector to instrument serial port. The instrument is not powered
by the PC.
Windows and Windows Vista are registered Microsoft Corporation trade marks.
HD45 / HD46 - 67 - V2.4
APPENDIX A
Control codes computing in MODBUS-RTU protocol
In MODBUS-RTU, two check modes for the transmitted data correctness coexist:
• Parity check on single byte
• Cyclic redundancy check (CRC) on the whole transmitted frame.
Codes are computed by the transmitting device as a function of the data to be
transmitted. The receiving device calculates again the codes as a function of the
received data and compares them with the ones attached to the message. If codes
are correct, the message is accepted and processed.
Parity check
It is a check performed on a single byte.
A bit is added at the end of each information byte so that bit-1 total number is:
• even, if even parity is used
• odd, if odd parity is used
Example: byte = 1100 0101, bit-1 number is four. The parity bit will be 0 in case of
even parity, or 1 if odd parity is used.
The protocol factory-default mode is even parity.
The instrument allows to edit or disable the parity check by means of the
configuration parameter P#060.
CRC code
CRC code is a 16-bit binary value computed in function of all the message bytes and is
attached at the end of the message to be transmitted.
The code computing procedure is as follows:
1. The 16 bits of the CRC register are all initialized to 1.
2. The exclusive OR (XOR) is performed between the CRC least significant byte
and the first byte of the message (excluding start, parity and stop bits). The
result becomes the new CRC value.
3. CRC register is shifted right by introducing a 0 on the left as the most
significant bit.
4. The shifted out bit at right is checked: if it is 1, XOR is performed between CRC
value and fixed value “1010 0000 0000 0001”. The result is the new CRC value.
5. Steps 3 and 4 are repeated till a total of 8 shifts is achieved.
6. Steps 2, 3, 4 and 5 are repeated for all the message bytes.
7. The final CRC value is placed at the end of the message starting from the least
significant byte, that will then be transmitted prior to the most significant one.
HD45 / HD46 - 68 - V2.4
Example: CRC computation for the message formed by the two information bytes
0000 0010 (02h) and 0000 0111 (07h).
CRC initialization (step 1) 1111 1111 1111 1111
First information byte 0000 0010
XOR computation (step 2) 1111 1111 1111 1101
1st right shift (step 3) 0111 1111 1111 1110 | 1
Fixed value (1 is the shifted out bit) 1010 0000 0000 0001
XOR computation (step 4) 1101 1111 1111 1111
2nd right shift (step 3) 0110 1111 1111 1111 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1100 1111 1111 1110
3rd right shift (step 3) 0110 0111 1111 1111 | 0
4
th
right shift (step 3) 0011 0011 1111 1111 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1001 0011 1111 1110
5th right shift (step 3) 0100 1001 1111 1111 | 0
6
th
right shift (step 3) 0010 0100 1111 1111 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1000 0100 1111 1110
7
th
right shift (step 3) 0100 0010 0111 1111 | 0
8
th
right shift (step 3) 0010 0001 0011 1111 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1000 0001 0011 1110
Second information byte 0000 0111
XOR Computation (step 2) 1000 0001 0011 1001
1st right shift (step 3) 0100 0000 1001 1100 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1110 0000 1001 1101
2nd right shift (step 3) 0111 0000 0100 1110 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1101 0000 0100 1111
3rd right shift (step 3) 0110 1000 0010 0111 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
XOR Computation 1100 1000 0010 0110
4th right shift (step 3) 0110 0100 0001 0011 | 0
5
th
right shift (step 3) 0011 0010 0000 1001 | 1
Fixed value (step 4, shifted out bit is 1) 1010 0000 0000 0001
HD45 / HD46 - 69 - V2.4
XOR Computation 1001 0010 0000 1000
6
th
right shift (step 3) 0100 1001 0000 0100 | 0
7
th
right shift (step 3) 0010 0100 1000 0100 | 0
8
th
right shift (step 3) 0001 0010 0100 0001 | 0
The final check code is CRC = 0001 0010 0100 0001 (1241h)
The least significant byte is 0100 0001 (41h) and is the first to be transmitted.
The most significant byte is 0001 0010 (12h) and is the last byte of the frame to be
transmitted.
HD45 / HD46 - 70 - V2.4
1.
TABLE OF CONTENTS
1. INTRODUCTION 2
1.1. Instruments versions available
4
2. FRONT PANEL DESCRIPTION
6
3. INSTALLATION AND CONNECTION
8
3.1. HD45… connection diagrams
10
3.2. HD46… connection diagrams
11
4. OPERATION MODE
12
4.1. Analog outputs
13
4.2. Relay outputs
13
4.3. LED indicators in HD45 BVR and HD45 BAR MODEL
21
4.4. Logging
21
4.5. Indicating a fault
22
5. CONFIGURATION
23
5.1. Authorization levels
24
5.2. Configuration through keyboard (HD46…DT…
only) 25
6. CALIBRATION
37
6.1. Replacement of R.H. and temperature module (HD46…only)
37
6.2. CO2
sensor calibration 38
7. COMMUNICATION PROTOCOL (
mini-USB output) 39
8. RS485 COMMUNICATION
40
8.1. MODBUS-RTU protocol
41
9. TECHNICAL SPECIFICATIONS
60
10. ORDERING CODES
65
APPENDIX A –
Check codes in MODBUS-RTU protocol 67
GUARANTEE
TERMS OF GUARANT EE
All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the
date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty
period, shall be deemed non efficient according to its own judgement. Complete replacement is excluded
and no damage claims are accepted. The DELTA OHM guarantee only covers instrument repair. The
guarantee is void in case of incidental breakage during transport, negligence, misuse, connection to a
different voltage than that required for the appliance by the operator. Finally, a product repaired or
tampered by unauthorized third parties is excluded from the guarantee. The instrument shall be returned
FREE OF SHIPMENT CHARGES to your dealer. The jurisdiction of Padua applies in any dispute.
The electrical and electronic equipment marked with this symbol cannot be disposed of in public
landfills. According to the Directive 2011/65/EU, the european users of electrical and electronic
equipment can return it to the dealer or manufacturer upon purchase of a new one. The illegal
disposal of electrical and electronic equipment is punished with an administrative fine.
This guarantee must be sent together with the instrument to our service centre.
IMPORTANT: Guarantee is valid only if coupon has been correctly filled in all details.
Instrument Code:
HD45 HD46
Serial Number
RENEWALS
Date Date
Inspector Inspector
Date Date
Inspector Inspector
Date Date
Inspector Inspector
GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone +39 049 8977150 | Fax +39 049 635596
www.deltaohm.com | info@deltaohm.com
The quality level of our instruments is the result of the constant development of the product. This may
produce some differences between the information written in this manual and the instrument you have
purchased. We cannot completely exclude the possibility of errors in the manual, for which we apologize.
The data, images and descriptions included in this manual cannot be legally asserted. We reserve the
right to make changes and corrections with no prior notice.
GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone +39 049 8977150 | Fax +39 049 635596
www.deltaohm.com | info@deltaohm.com
V2.4
22/01/2018
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