Biddle Modbus User manual

a
Manual
Modbus / BACnet
Model SR IndAC2 NOZ2
for software version U3.0 – 01
Original Manual English

MODBUS / BACNET
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. . . Contents
1 Introduction 3
1.1 About this manual 3
1.2 Required basic knowledge 3
1.3 How to read this manual 3
2 Installation 6
2.1 Special points 6
2.2 Connecting the gateway for BACnet (accessory) 8
2.3 Connecting the unit to Modbus 8
2.4 Entering the Modbus node address 10
2.5 Activating the connection 12
2.6 Configuring the gateway for BACnet (accessory) 12
3 Frequently used register addresses 13
3.1 Introduction 13
3.2 Register addresses for room temperature control 13
3.3 Other frequently used register addresses to be set 15
3.4 Other frequently used register addresses that can be read out 17
4 All register addresses 19
4.1 Register types 38
5Errors 39
5.1 Resolving simple problems 39
5.2 Reading out errors 40
6Addresses 42
Keywords 43

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1. . Introduction
1.1 About this manual
1.2 Required basic knowledge
1.3 How to read this manual
This manual describes the connection of the comfort air cur-
tain SR, the industrial air curtain model IndAC2or the air
heater model NOZ2to the communication protocol Modbus
RTUand itsuse.
For a possible connection to BACnet, the manual describes
the installation of a gateway which makes communication with
BACnet possible. The contents of this manual also apply to
BACnet, unless otherwise specified.
For IndAC2and NOZ2, it is the case that only units with an
automatic control (type Auto) can be connected to a commu-
nication protocol.
To use this manual, you must have general knowledge of the
communication protocol (‘Modbus RTU Slave’ or ‘BACnet’).
This manual is not a guide to this protocol.
For more information about Modbus, please refer to the spec-
ifications and guidelines that are available on the website of the
Modbus Organization: www.modbus.org.
1.3.1 Designations used in the manual
The following symbols are used inthe manual:
Note:
nRefers to an important section in the text.
Caution:
cIf you do not carry out the procedure or action
correctly, you may cause damage to the unit.
Follow the instructions precisely.

INTRODUCTION MODBUS / BACNET
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Warning:
wIf you do not carry out the procedure or
action correctly, you may cause physical injury
and/or damage.
Follow the instructions precisely.
Danger:
dIs used to designate actions that are not
permitted.
Ignoring this prohibition may lead to serious
damage or to accidents resulting in physical
injury.
1.3.2 Definitions
Modbus RTU Communication protocol
BACnet Communication protocol
gateway Module which attends to the translation between two differ-
ent communication protocols.
communication parameter Characteristics of the Modbus connection (baud rate, parity,
stop bit).
Modbus node address Number by which the Modbus system recognises the unit.
register address Position (number) in the Modbus system where the value/vari-
able can be found (also called the Modbus address).
b-touch menu parameter Number of the (corresponding) function that can be set in the
b-touch control panel (via user interface or via settings.txt).
unit code Eight-digit code that identifies the unit type.

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unit ID Unique number of the control circuit board of the unit. This
number is used, amongst other things, to specify (via the b-
touch control panel) which unit is used as master.
auto master unit An auto master unit has a control circuit board for automatic
control and is selected in order to attend to the global Biddle
regulation. This unit also regulates the communication in a
master-slave system.
auto slave unit An auto slave unit has a control circuit board for automatic
control, but is largely regulated by the auto master unit.
basic unit Only with units IndAC2and NOZ2:A basic unit has no control
circuit board of its own.
single master system Set-up of a single auto master unit without auto slave units.
Optionally, one or more basic units have been linked.
master-slave system Combination of a single auto master unit and one or more
auto slave units.
multiple master system Combination of multiple auto master units.
local register The value of a local register can be individually set and/or read
out for each connected unit.
global register The value of a global register is the same for each connected
unit and can be set and/or read out on each unit.
1.3.3 Related documentation
In addition to this manual, you need the manual for the unit
that is being used.

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2. . Installation
2.1 Special points
2.1.1 Modbus/BACnet
The unit is designed for communication with a Modbus sys-
tem. With the aid of an IntesisBox Gateway, it is also possible
to communicate with a BACnet system.
2.1.2 Multiple units on Modbus
If you connect multiple units to the Modbus system, various
set-ups are possible. The set-up determines from which unit
the local and global registers can be set and/or read out.
Opmerking:
nThe global registers are used by the automatic con-
trol.
Opmerking:
nFor operation, it does not matter whether units
without control circuit board (type basic) are also
present.
Opmerking:
nFor the illustrations, the NOZ2has been used. The
same principles apply to other units.
SINGLE MASTER MASTER - SLAVE MULTIPLE MASTER
Local registers:
Relate to the connected unit.
Local registers:
Relate to the connected unit / the
connected units.
Local registers:
Relate to the connected units.
Global registers:
Relate to the connected unit.
Global registers:
Are the same for each unit.
Global registers:
Relate to the connected units.

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2.1.3 Communication parameters
The Modbus system must comply with the following communi-
cation parameters:
The turnaround time between the unit and Modbus is 4.2
msec.
2.1.4 Wiring
A twisted-pair cable must be used for connection to the Mod-
bus system. The cable must also have a third core for the
GND (grounding). Normally, a four-pole, twisted-pair cable is
used; one pair is used for communication and one core from
the other pair is used as the GND.
Modbus A = -
Modbus B = +
GND = ground
Note:
nIf there is no communication, this may be caused by
incorrectly connected wiring. Swap the A- and B+
wires.
COMMUNICATION PARAMETER VALUE
Baud rate 9600
DATA 8
Parity none
Stop bits 1

INSTALLATION MODBUS / BACNET
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2.2 Connecting the gateway for BACnet (accessory)
The unit is designed for communication with a Modbus sys-
tem. With the aid of a gateway, this can be converted to com-
munication that is suitable for BACnet.
Warning:
wMake sure that the mains supply is switched
off.
Warning:
wMake sure that the power supply to the
BACnet system which is to be connected is
switched OFF.
1. Mount the gateway to the wall or on a DIN rail.
2. Connect the gateway to the BACnet IP (terminal 1), in
accordance with the wiring diagram.
3. Using the adapter, connect the gateway to a power socket
(connection 2), in accordance with the wiring diagram.
Note:
nIn the absence of a power adapter, you yourself must
fit a switch (250V, 6A) between the gateway and the
power supply.
4. Connect the unit to the gateway (terminal 3) as described
in 2.3.2 Connecting the unit to Modbus.
2.3 Connecting the unit to Modbus
2.3.1 Accessing the control circuit board
For SR:The connection for Modbus is on the top of the
unit.
For IndAC2and NOZ2:The connection for Modbus is
on the control circuit board in the unit.
• Open the unit as described in the unit’s operating manual.
Warning:
wMake sure that the mains supply is switched
off.

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2.3.2 Connecting the unit to Modbus
1. Lay a cable between the Modbus system and the unit.
In the case of BACnet: Lay the cable between the gate-
way and the unit.
2. Attach the cable to the unit, in accordance with the wiring
diagram supplied:
In the case of BACnet: Use the circuit diagram below.
For SR:
- Connect the cable to terminal X74 on the upper side
of the unit.
For IndAC2and NOZ2:
- Feed the cable into the electronics housing.
- Connect the cable to terminal X380 1of the unit’s
control circuit board.
Note:
nFor a more reliable signal, it is possible to connect a
120 Ohm resistor. For this purpose, place a bridge
between positions 1 and B of terminal X382 on the
control circuit board in the unit.
Connecting multiple units to Modbus
If you also want to be able to read out the local registers of
each unit individually, the Modbus connection must be con-
nected in series.
For SR:
1. Lay a cable between the units.
2. Connect the cable on both units to terminal X74 (on the
upper side of the unit).
3. Repeat steps 1 and 2 for each unit that is to be connected
in series.

INSTALLATION MODBUS / BACNET
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For IndAC2and NOZ2:
Note:
nOnly units with a control circuit board (type Auto)
can be connected in series to the Modbus system.
1. Lay a cable between the units.
2. Feed the cable into the electronic housings.
3. Connect the cable in the first unit to terminal block X382,
in accordance with the wiring diagram.
4. Connect the cable in the second unit to terminal block
X380, in accordance with the wiring diagram.
5. Repeat steps 1 to 4 inclusive for each unit that is to be
connected in series.
2.4 Entering the Modbus node address
The default value for the Modbus node address is 1. Depend-
ing on the Modbus network, it may be necessary to change
this. This can be done via the dip switches on the control cir-
cuit board.
Note:
nValid Modbus node address numbers are 1 – 247.
Note:
nThe Modbus node address must be converted to an
8-digit code.
2.4.1 Determining the code
The dip switches are coded as follows:
Determine the 8-digit code of the Modbus node address as
follows:
1. Divide the number by 2 over and over again until the result
is 0. After each division, note the residual value.
DIP SWITCH 12345678
value (ON) 1248163264128

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For example, Modbus node address 206:
2. Note down the residual values from left to right. This is
the code.
For example, for Modbus node address 206: 01110011
Note:
nNote down the residual values from left to right.
2.4.2 Entering the Modbus node address
Enter the code of the Modbus node address with the aid of
the 8 dip switches 1on the control circuit board.
•0=OFF
•1=ON
For example, Modbus node address 206:
With SR units the dip switches on the control circuit
board are difficult to access:
• Use a mirror in order to be able to see the dip switches
better.
• Possibly, partially loosen the control circuit board as
described in the servicing chapter of the unit’s manual.
VALUE / 2 RESULT RESIDUAL VALUE
206 / 2 103 0
103 / 2 51 1
51 / 2 25 1
25 / 2 12 1
12 / 2 6 0
6 / 2 3 0
3 / 2 1 1
1 / 2 0 1
DIP SWITCH 12345678
code 01110011
position off on on on off off on on

INSTALLATION MODBUS / BACNET
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2.5 Activating the connection
1. Connect the possible gateway for BACnet (accessory) to
the mains supply, making use of the adapter.
Warning:
wIn the event that the adapter is absent:
Connect the gateway to the mains supply in
accordance with the locally applicable
requirements.
2. Switch on the mains supply.
3. Activate the connection with the communication protocol
by switching the power supply of the unit off and on.
Note:
nIf the connection with the communication protocol
is active, you can possibly remove the b-touch control
panel.
2.6 Configuring the gateway for BACnet (accessory)
In order to make communication with BACnet possible, the
gateway has to be configured.
1. Download the necessary software from the manufac-
turer’s website.
www.intesis.com/down/mb/linkboxmb.html
2. Connect a computer with the software to gateway 1.
3. Install the software.
4. Program the register addresses that you wish to use.
Note:
nDuring the installation, a manual is saved to:
C:\Intesiss\LinkBoxMB\DocsMB
Note:
nThe number of data points to be used is dependent
on the module applied.

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3. . Frequently used register
addresses
3.1 Introduction
This chapter describes frequently used functions and their cor-
responding register addresses. Listed in chapter 4are all regis-
ter addresses.
Note:
nFunctions can be adjusted both on the b-touch
control panel and via Modbus. The most-recently
sent signal is valid.
Note:
nSome settings can only be adjusted via the b-touch
control panel.
Note:
nIt may occur that the system applied uses a value of
1 higher than the register addresses given here. In
that case, use 101 for register address 100, for
example.
3.2 Register addresses for room temperature control
The automatic control keeps the room temperature at the set
desired temperature. For this purpose, the control makes use
of a number of factors:
REGISTER
ADDRESS DESCRIPTION RO/RW*CONTROL UNIT MINIMUM MAXIMUM DEFAULT
424 Required room temperature rw 0.1°C 10 400 210
209 Discharge temperature setpoint. ro 0.1°C
208 Discharge temperature ro 0.1°C
203 Room temperature ro 0.1°C
149 Heating output ro %
*ro = read only (read only)
*rw = read & write (read and write)

FREQUENTLY USED REGISTER ADDRESSES MODBUS / BACNET
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424 Required room temperature You can set the temperature to a comfortable level. In this
register address, the default value of the desired temperature
is set. Temperature adjustments via the home screen of the b-
touch control panel are only possible if the register address
414 has been set to 0 (changes via b-touch permitted) and
apply only until the start time of the next switching moment
by Modbus.
209 Discharge temperature setpoint. The required discharge temperature is calculated by the auto-
matic control.
In the case of multiple units, the required discharge tempera-
ture is set at the same for each unit.
208 Discharge temperature The discharge temperature is used by the automatic control.
In the case of multiple units, the average value is used.
Note:
nIf a sensor is not detected, the control for this
sensor uses the lowest possible value (-499).
203 Room temperature The measured room temperature is used by the automatic
control.
The value is corrected with the value that has been set in
Menu parameter 9. Calibration of the b-touch control panel.
Note:
nMenu parameter 71. Indoor temperature sensor of
the b-touch control panel determines which sensor is
used for the automatic control.
149 Heating output The automatic control calculates how much heat must be
added and adjusts the position of the water valve accordingly.

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3.3 Other frequently used register addresses to be set
Other register addresses to be set are:
420 Turning the unit ON and OFF You can switch the unit ON and OFF manually, using the con-
trol panel.
The unit can also be switched ON and OFF in other ways:
•Usingexternalcontrols
• Via the internal timer or via an external release signal on
the unit.
Values
REGISTER
ADDRESS DESCRIPTION RO/RW*CONTROL UNIT MINIMUM MAXIMUM DEFAULT
420 Turning the unit ON and OFF rw - 0 2 1
421 Turning the heating on and off rw - 0 1 1
422 Manual setting of the strength rw % 0 100 50
423 Adjusting the automatic
strength control
rw - -3 3 0
425 Automatic or manual control rw 0 1 1
*ro = read only (read only)
*rw = read & write (read and write)
VALUE OPTION DESCRIPTION
0 Off The unit is switched off.
• The unit reacts to signals on the inputs on the unit and to the control panel,
and to the timer.
• If this function is enabled, the unit will start working when the temperature in
the room drops below the night temperature.
• The frost protection is active.
1 On The unit is on (normal operation)
2 Holiday setting
(not applicable)
The unit is switched off.
• The unit does not react to signals on the inputs or to the timer.
• Night temperature is disabled.
• The frost protection is active.

FREQUENTLY USED REGISTER ADDRESSES MODBUS / BACNET
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421 Turning the heating on and off The unit’s heating can be switched on and off manually.
Switching the heating off disables the room temperature con-
trol .
If the heating has been switched on via this function, it may
occur that the automatic control switches the heating off
again. This may be due to an external signal, for example, or
because the desired temperature has been reached.
The heating can also be switched off by the control itself.
422 Manual setting of the strength With the manual setting, you can select the strength. To
achieve maximum comfort with minimum energy consump-
tion, Biddle recommends selecting the lowest strength at
which the airflow touches the ground. This setting may possi-
bly need to be changed during the course of the day.
The unit can only be controlled manually if the functions
below have been set as follows:
423 Adjusting the automatic strength con-
trol
In automatic mode, the strength and temperature of the air-
flow are regulated automatically. Due to weather conditions,In
certain circumstances, you might want to adjust the automatic
setting. If you feel a cold draught along the floor, you can
increase the automatic strength.
The unit can only be controlled automatically if the functions
below have been set as follows:
MENU PARAMETER REGISTER ADDRESS DESCRIPTION VALUE
1- Selectmodes
(Options for modes)
1 = allowed: manual
3 = allowed: manual,
automatic
0.6 405 Automatic or manual control
Current status
Caution: Use this address only for
reading out. Use 425 for writing.
0 = manual

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425 Automatic or manual control The unit has an automatic mode and a manual mode. When
the unit is switched on, it is always in automatic mode.
In the manual mode, the unit operates with a fixed set fan
speed.
3.4 Other frequently used register addresses that can be read out
Frequently used register addresses that can be read out are:
102 Fan strength In the event of multiple units, the fan strength is the same for
all units.
With the NOZ2:In automatic mode, the fan strength is
adjusted to the temperature of the airflow and the set height
of the unit.
With the SR and IndAC2:In automatic mode, the fan
strength is adjusted to the temperature difference between
indoors and outdoors and the set height of the unit.
MENU PARAMETER REGISTER ADDRESS DESCRIPTION VALUE
1- Selectmodes
(Options for modes)
2 = allowed: automatic
3 = allowed: manual,
automatic
0.6 405 Automatic or manual control
Current status
Caution: Use this address only for
reading out. Use 425 for writing.
1 = automatic
REGISTER
ADDRESS DESCRIPTION RO/RW*CONTROL UNIT MINIMUM MAXIMUM DEFAULT
102 Fan strength ro %
103 Ventilation valve position ro % 0 128 (=10
0%)
204 Outdoor temperature ro 0.1°C
*ro = read only (read only)
*rw = read & write (read and write)

FREQUENTLY USED REGISTER ADDRESSES MODBUS / BACNET
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103 Ventilation valve position Only with NOZ2units with ventilation (types 25V and
50V)
Depending on the settings, the unit can blow a set percentage
of ventilation air.
Note:
nIn menu parameter 35.1, ‘Ventilation control’, of the
b-touch control panel, one can enter whether the
valve position can be set on a percentage basis or
whether it can only be either entirely open or
entirely shut.
Note:
nIn the case of ventilation units without recirculation,
the value is always 128 (100% open).
204 Outdoor temperature With the SR and IndAC2the outdoor temperature is used
by the automatic control. An average value is taken over a
period of 3 minutes.
The outdoor temperature can be determined in various ways:
• By the IR sensor. (only with SR)
•By a wired outdoor sensor.
•By making an estimate, based on the month of the year and
your country.
With the NOZ2this function is not applicable.

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4. . All register addresses
Note:
nIt may occur that the system applied uses a value of
1 higher than the register addresses given here. In
that event, you use 101 for register address 100, for
example.
Note:
nMenu parameters 0 – 1 are functions in the home
screen of the b-touch control panel.
Note:
nFor all register addresses, the data type is int 16.
MENU PARAMETER
REGISTER ADDRESS
DESCRIPTION CONTROL UNIT
MINIMUM MAXIMUM DEFAULT OPTIONS RO* / RW*
LOCAL / GLOBAL
100 Discharge tempera-
ture setpoint
0.1°C ro L
101 For SR:run time,
discharge out-let
motor
pulsen
motor 1/
50 Hz
ro L
102 Fan strength % 0 100 ro L
103 For NOZ2:
Ventilation valve posi-
tion
% 0 128
(=100%)
ro L

ALL REGISTER ADDRESSES MODBUS / BACNET
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104 Status bits
outputs
Bit 0 6 0 (+1) = output 1
1 (+2) = output 2
2 (+4) = cooling
3 (+8) = heating
4 (+16) = on
5 (+32) = room con-
trol active (menu
parameter 45.1 (105)
is not active)
6 (+64) = output 3
ro L
45.1 105 Valve position set-
point active with
extra frost protection
%0100 roG
140 Unit temperature,
sensor X360
0.1°C ro L
141 Discharge tempera-
ture, sensor X350
0.1°C ro L
142 Error bits from unit Bit 0 15 ro L
144 Status bits
inputs
Bit 0 6 0 (+1) = ok (not
used)
1 (+2) = err (not
used)
2 (+4) = status config.
button
3 (+8) = input 1
4 (+16) = input 2
5 (+32) = PIR input
6 (+64) = input 3
ro L
145 Temperature sensor
X540
For SR and
IndAC2: Outdoor
temperature
For NOZ2:Room
temperature
0.1°C ro L
146 Input voltage, ana-
logue input X375
0.01 V ro L
MENU PARAMETER
REGISTER ADDRESS
DESCRIPTION CONTROL UNIT
MINIMUM MAXIMUM DEFAULT OPTIONS RO* / RW*
LOCAL / GLOBAL