Daikin EKMBPP1 User manual

Installation manual
Modbus adapter English
Installation manual
Modbus adapter
EKMBPP1

Table of contents
Installation manual
2
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
Table of contents
1 About this document 3
2 Specific installer safety instructions 4
3 About the kit 7
3.1 Components....................................................................................... 7
3.2 Basic parameters ............................................................................... 8
3.3 Compatibility ...................................................................................... 8
4 About the box 9
4.1 To unpack the adapter ....................................................................... 9
5 Installation 10
5.1 Precautions when installing the kit..................................................... 10
5.2 Preparing the installation site............................................................. 10
5.3 To install the Modbus adapter............................................................ 11
5.3.1 To install the Modbus adapter with the KRP1BC101
installation box ........................................................................ 11
5.3.2 To install the Modbus adapter PCB with field supplied casing 13
5.4 Connecting the electrical wiring ......................................................... 13
5.4.1 Overview of electrical connections.......................................... 14
5.4.2 To connect the power supply.................................................. 15
5.4.3 To connect the P1P2 wiring.................................................... 16
5.4.4 To connect the RS485 wiring.................................................. 17
6 Configuration 18
6.1 Status LEDs ....................................................................................... 18
6.2 P1P2 communication ......................................................................... 20
6.3 Modbus protocol ................................................................................ 20
6.3.1 Modbus address range ........................................................... 20
6.3.2 Modbus registers .................................................................... 21
6.3.3 Modbus master timeout .......................................................... 22
6.3.4 Terminating resistor settings................................................... 23
6.4 Control functions ................................................................................ 23
6.4.1 Unit control.............................................................................. 23
6.4.2 Control update mode .............................................................. 24

1 About this document
Installation manual
3
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
6.4.3 Control limiting ........................................................................ 26
6.4.4 VAM-specific control ............................................................... 27
6.4.5 Smart Grid control................................................................... 27
6.5 Readback data................................................................................... 28
6.5.1 Remote controller readback.................................................... 28
6.5.2 Group readback ...................................................................... 28
6.5.3 Unit readback.......................................................................... 29
6.5.4 Error codes ............................................................................. 30
6.6 Smart Grid.......................................................................................... 31
6.7 Software update................................................................................. 33
7 Hand-over to the user 33
8 Disposal 34
9 Technical data 35
9.1 Wiring diagram................................................................................... 35
10 Appendix 36
10.1 Modbus addresses............................................................................. 36
1 About this document
Target audience
Authorised installers
About the documentation
The instructions delivered with the kit are intended to guide you through
the installation of the EKMBPP1 adapter into a KRP1BC101 installation
box and through the connection and configuration of the EKMBPP1
adapter.
Read this installation manual prior to use and keep it for future
reference. Also read the installation manual of the indoor unit before
installing the EKMBPP1 adapter.
Damage caused by non-observance of these instructions are not under
the responsibility of Daikin.

2 Specific installer safety instructions
Installation manual
4
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
Documentation set
This document is part of a documentation set. The complete set
consists of:
▪General safety precautions:
▪ Safety instructions that you must read before installing
▪ Format: paper (in the box of the indoor unit)
▪Installation manual:
▪ Installation instructions
▪ Format: paper (supplied in the kit)
Latest revisions of the supplied documentation may be available on the
regional Daikin website or via your dealer.
The original instructions are written in English. All other languages are
translations of the original instructions.
2 Specific installer safety
instructions
Always observe the following safety instructions and regulations.
General
DANGER
All wiring MUST be performed by an authorised electrician and
MUST comply with the applicable national wiring regulation.
Possible consequence: property damage and electrocution.

2 Specific installer safety instructions
Installation manual
5
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
Installation (see "5 Installation" [4 10])
DANGER: RISK OF ELECTROCUTION
▪ Turn off the indoor unit power supply before mounting the
PCB.
▪ Do NOT handle the PCB with wet hands.
▪ Do NOT let the PCB get wet.
▪ Do NOT disassemble, modify or repair the PCB.
▪ Turn OFF the indoor unit power supply if the PCB is
damaged.
▪Possible consequence: electrocution.
DANGER: RISK OF ELECTROCUTION
Connect the earth wires correctly. Possible consequence:
electrocution.
DANGER: RISK OF ELECTROCUTION
Do NOT connect or turn on power supply before you have
mounted the adapter, connected the electrical wiring and have
closed the adapter.
DANGER: RISK OF ELECTROCUTION
When powered by the indoor unit or any other non-SELV
(Safety Extra Low Voltage) power supply, all external wiring
and electrically attached devices MUST be double insulated to
prevent access by non-qualified persons. When this is not
possible, the EKMBPP1 MUST be powered by a SELV power
supply.
DANGER: RISK OF ELECTROCUTION
Do NOT turn on the indoor unit power supply before you have
mounted the PCB inside the unit (with or without installation
box or mounting plate), connected the electrical wiring and
closed the indoor unit or indoor unit switch box. Possible
consequence: electrocution.

2 Specific installer safety instructions
Installation manual
6
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
WARNING
When applying this Modbus adapter (EKMBPP1), the
installation requirements described in the indoor and outdoor
unit installation manuals of the system to which this Modbus
adapter is connected, including any countermeasures, remain
applicable.
For systems NOT using R32 refrigerant, this Modbus adapter
can be the only (and main) remote controller connected. For
systems using R32 refrigerant, the installation of additional
remote controllers may be required.
Hand-over to the user (see "7 Hand-over to the user" [4 33])
DANGER
▪ Do NOT disassemble, modify, or repair the adapter. This
can cause fire, electrical shock, or injury.
▪ Do NOT allow the adapter to get wet or use it when bathing
or doing similar activities with water. This can cause
electrical shock or fire.
▪ Do NOT use the adapter near medical equipment, or
persons using cardiac pacemakers or defibrillators. This
can cause life-threatening electromagnetic interference.
▪ Do NOT use the adapter near auto-control equipment such
as automatic doors or fire alarm equipment. This can cause
accidents due to erroneous equipment behaviour.
▪ In case of abnormal odour or sound, overheating, or smoke
coming out of the adapter, immediately disconnect the
indoor unit from its power supply. Otherwise, this can lead
to fire or malfunction. If this happens, consult your dealer.
▪ In case you drop or damage the adapter, disconnect the
indoor unit from its power supply. Otherwise, this can lead
to fire or malfunction. If this happens, consult your dealer.

3 About the kit
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
3 About the kit
The EKMBPP1 kit is a Modbus interface to monitor and control the VRV
and Sky Air ranges of air conditioners, as well as the VAM and VKM
ventilation units. The interface is compatible with units that have a P1P2
remote controller connection, allowing control of up to 16 units in a
single group. Functionality includes:
▪ Group control of unit settings (setpoint, fan speed, operation mode,
airflow direction, on/off state)
▪ Control over the lock state of individual remote controller buttons
▪ Control limiting (limit possible user adjustments to specified ranges)
▪ Control over settings specific to VAM and VKM units (fan speed,
damper control, on/off state)
▪ Unit monitoring (group and individual readback of unit data)
▪ Smart Grid control on Sky Air ranges.
3.1 Components
GND DB- DA+
X2M
X7M
P2
NC
P1
0V
NC
a
a
a
a
LED1~4
HAP
SS2 SS3
SS1
DS1
X1A
+V
X1A Power supply connector
X2M RS485 connector (Modbus)
X7M P1P2 connector
LED*, HAP Status LEDs (see "6 Configuration" [4 18] for more information about LED
behaviour)
DS1 DIP switch
SS* Slide switches

3 About the kit
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
aMounting holes
3.2 Basic parameters
Parameter Value
Power supply Regulated voltage: 15~24VDC, 120mA
maximum 3W
Operating temperature -10°C~50°C
Storage temperature -25°C~70°C
Relative humidity maximum 95% at 40°C, non-condensing
3.3 Compatibility
Make sure the indoor unit is compatible with the kit.
For an exhaustive list of compatible models and the corresponding
required installation box, see the compatibility matrix or data book of the
indoor unit or the general catalogue.

4 About the box
Installation manual
9
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
4 About the box
4.1 To unpack the adapter
b
a
c
e
d
aEKMBPP1 Modbus adapter PCB
bInstallation manual
cPCB clamp (4×)
dCable gland and locknut (M20×1.5)
eWire harness for power supply (2×)

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
5 Installation
5.1 Precautions when installing the kit
DANGER: RISK OF ELECTROCUTION
▪ Turn off the indoor unit's power supply before installing the
kit.
▪ Do NOT handle the kit with wet hands.
▪ Do NOT let the kit get wet.
▪ Do NOT disassemble, modify or repair the kit.
▪ Turn OFF the indoor unit's power supply if the kit is
damaged.
▪Possible consequence: electrocution.
WARNING
When applying this Modbus adapter (EKMBPP1), the
installation requirements described in the indoor and outdoor
unit installation manuals of the system to which this Modbus
adapter is connected, including any countermeasures, remain
applicable.
For systems NOT using R32 refrigerant, this Modbus adapter
can be the only (and main) remote controller connected. For
systems using R32 refrigerant, the installation of additional
remote controllers may be required.
5.2 Preparing the installation site
The EKMBPP1 is an option PCB. The installation procedure and
installation location of the PCB vary depending on the unit(s). See the
installer reference guide of the indoor unit for more information.
The KRP1BC101 installation box described in this manual has to be
installed onto the indoor unit. In case of a field supplied casing, see the
installation manual of that casing for more information on the installation
location. See "5.3 To install the Modbus adapter" [4 11] for installation
instructions.

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
INFORMATION
Also read the maximum cable length requirements set out in
"5.4.1 Overview of electrical connections" [4 14].
5.3 To install the Modbus adapter
Install the EKMBPP1 inside the indoor unit, in the space foreseen for
the option PCB. See the installer reference guide of the indoor unit for
more information.
In case of KRP1BC101 installation box, follow the procedure in "5.3.1
To install the Modbus adapter with the KRP1BC101 installation box" [4
11] and the KRP1BC101 installation manual.
In case of field supplied casing, follow the procedure in "5.3.2 To install
the Modbus adapter PCB with field supplied casing" [4 13] and the
installation manual of that casing.
5.3.1 To install the Modbus adapter with the
KRP1BC101 installation box
The steps below only describe the procedure for the KRP1BC101
installation box.
1Open the KRP1BC101 installation box.
2Replace the left black cable entry ring on the KRP1BC101 installation
box with the cable gland and locknut (M20×1.5) provided in the
EKMBPP1 kit.
3Replace the right black cable entry ring on the KRP1BC101
installation box with the blinding bush provided in the KRP1BC101
kit.
4Insert the PCB clamps into the mounting holes of the PCB.
5Prepare the wiring while the PCB is still outside the installation box.
The KRP1BC101 installation box is a tight space. It is recommended
to prepare the wiring before installing the PCB inside the installation
box.

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
▪ Insert 10~15cm of the power supply cable, the RS485 cable, and
the P1P2 cable together through a heat shrink tube (field supplied)
and use a heat gun to shrink the tube. Leave enough free room at
the end of the cables so they can still be connected easily to the
PCB once inside the installation box.
▪ With the cable gland oriented on top of the box, insert the power
supply cable, the RS485 cable, and the P1P2 cable through the
right cable gland, from the outside of the box to the inside. Inside
the box, the cables must split again into three separate cables so
they can reach their respective terminals without any strain, as
shown on the following figure.
▪ Connect the wiring to the PCB. For more information, also see "5.4
Connecting the electrical wiring" [4 13].
GND
DB-
DA+
P2 NC P1
0V
NC
+V
X2M
X7M
X1A
6Install the PCB with the PCB clamps into the KRP1BC101 installation
box. Make sure the PCB is oriented in the right direction:

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
▪ The cable glands on top of the box.
▪ X1A connector to the left.
▪ X7M connector below the cable glands.
▪ X2M connector to the right.
7Provide wire strain relief.
▪ Inside the box: Tighten the cable glands. Leave enough cable slack
inside the installation box before tightening.
8Close the box with the screw provided in the KRP1BC101 kit.
9Follow the installation instructions of the KRP1BC101 installation box.
Make sure the box is mounted onto the indoor unit for earthing as
described in the KRP1BC101 manual.
5.3.2 To install the Modbus adapter PCB with field
supplied casing
In case of field supplied casing, EKMBPP1 MUST be installed using:
▪ A double insulated plastic box, or
▪ A metal box which is earthed properly to be compliant to the
applicable electrical safety norm.
DANGER: RISK OF ELECTROCUTION
Connect the earth wires correctly. Possible consequence:
electrocution.
5.4 Connecting the electrical wiring
DANGER: RISK OF ELECTROCUTION
Do NOT connect or turn on power supply before you have
mounted the adapter, connected the electrical wiring and have
closed the adapter.

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
DANGER: RISK OF ELECTROCUTION
When powered by the indoor unit or any other non-SELV
(Safety Extra Low Voltage) power supply, all external wiring
and electrically attached devices MUST be double insulated to
prevent access by non-qualified persons. When this is not
possible, the EKMBPP1 MUST be powered by a SELV power
supply.
5.4.1 Overview of electrical connections
Power supply
Connector X1A (screw terminal)
See the manual of the indoor unit
Only use harmonised wire providing double insulation
suitable for the applicable voltage (1m wiring harness
included as accessory).
Wire size: 0.32~1.25mm²
Maximum length: 10m
Voltage: see "3.2 Basic parameters" [4 8](a)
(a) When not powering the kit from the unit, make sure the external power
supply adheres to the power supply specification.
Indoor unit (P1P2)
Connector X7M (screw terminal)
See the manual of the indoor unit
Only use harmonised wire providing double insulation
suitable for the applicable voltage.
Wire size: 0.75~1.25mm²
Maximum length: 500m
Voltage: 16VDC — 120mA
Modbus Interface (RS485)
Connector X2M (screw terminal)
See the installation manual of the Modbus interface

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
RS485 cables must use 24AWG stranded, twisted pair,
shielded or unshielded to CAT3, CAT4 or CAT5
specification. Use a twisted pair for connections DA, DB
and an extra core for connection GND.
Maximum length: 500m
5.4.2 To connect the power supply
Power supplied by the indoor unit
Power for EKMBPP1 can be supplied from the indoor unit PCB.
For Sky Air units, connect to X35A on the indoor unit PCB.
For VRV units, connect to either X18A or X35A on the indoor unit PCB.
See the indoor unit installer reference guide to determine the correct
terminal.
For VAM units, connect to either X11A, X18A or X35A on the VAM
PCB.
1Connect the wiring harness (EKMBPP1 accessory) to screw terminal
X1A on the EKMBPP1.
2Connect the other end of the wiring harness to the indoor unit PCB.
X18A /
X35A /
X11A
0V
+V
0V
NC
X1A
+V
External power supply
The EKMBPP1 can be powered by an external power supply (field
supplied). For more information, see "3.2 Basic parameters" [4 8].

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
5.4.3 To connect the P1P2 wiring
INFORMATION
▪ The indoor unit's P1P2 terminal can be connected to
maximum 2 controllers.
▪ In the indoor unit switch box, the cable is connected to the
same terminals the user interface is connected to (P1P2).
For more information, see the installation manual of the
indoor unit.
▪ The 2 wires from the cable are NOT polarised. When
connecting them to the terminals, their polarity does NOT
matter.
1Connect indoor unit terminals P1 and P2 to the EKMBPP1 terminals
P1 and P2 on the X7M connector.
P1 P2
1
P1 P2
2
P1 P2
*
P1 P2
X7M
P2
NC
P1
2Ensure strain relief by routing the cable along the cable path
suggested in the indoor unit installation manual.

5 Installation
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
INFORMATION
▪ The EKMBPP1 can operate in Master or Slave mode with
any remote controller. Note that some wireless remote
controllers (BRC*) may require the corresponding receiver
to be configured to operate in Sub (S) mode when the
EKMBPP1 is in Main (M) mode. See the installation manual
of the unit for more information.
▪ Only 1 Modbus master is allowed.
5.4.4 To connect the RS485 wiring
The RS485 D-Bus MUST be installed using a twisted pair cable, as
shown in the following figure, to connect terminals DA(+) and DB(-).
▪ Terminal DA(+) MUST be connected to all other DA(+) terminals, on
every EKMBPP1 kit.
▪ Terminal DB(-) MUST be connected to all other DB(-) terminals, on
every EKMBPP1 kit.
▪ The common terminal ground (GND) MUST be connected together,
on every EKMBPP1 kit. When using a shielded cable, the shield can
be used for this purpose.
DB- DA+
GND DB- DA+
X2M
GND DB- DA+
X2M

6 Configuration
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
NOTICE
It is recommended that the GND connection is connected to
local earth at a single point only.
For information on the terminating resistance, see "6.3.4 Terminating
resistor settings" [4 23].
6 Configuration
6.1 Status LEDs
The EKMBPP1 has 5 LEDs that display information about the current
status. See "3.1 Components" [4 7] for the location of the LEDs on the
PCB.
LED Description
LED1 Status LED 1 (A)
LED2 Status LED 2 (B)
LED3 Indicates receiving P1P2 communication(a)
LED4 Indicates receiving Modbus (RS485) communication(a)
HAP Indicates normal CPU operation(b)
(a) LED blinks for 20~40ms every time communication is received.
(b) LED blinks at a 400ms interval.

6 Configuration
Installation manual
19
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
LED 1 and LED 2 behaviour
LED2
LED1
LED2
LED1
LED2
LED1
LED2
LED1
LED2
LED1
LED2
LED1
a
b
c
d
e
f
LED 1 Green LED
LED 2 Red LED
LED ON
LED ON
LED OFF
aPower-up sequence
bNo error
cP1P2 search mode
dUnit error
eU5 error (AC unit is missing)
fRS485 communicaton timeout

6 Configuration
Installation manual
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EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
6.2 P1P2 communication
The EKMBPP1 enters P1P2 search mode in three cases:
1 When the adapter is powered on, it enters the P1P2 search mode.
The adapter cycles between Sub mode and Main mode.
2 If the adapter is in Main mode, it enters the P1P2 search mode when
a communication error occurs with all connected indoor units.
3 If the adapter is in Sub mode, it enters the P1P2 search mode when
a communication error occurs with the main R/C.
When the power is first turned on, the adapter operates in Sub mode.
The adapter waits for an initial request from the main remote controller.
The adapter then switches to Main mode if no initial command is
received for 90 seconds after power ON. In Main mode, the adapter
performs auto addressing and attempts to assign addresses to indoor
units. If there is no response, the adapter will try to auto address again.
If there is still no response, the adapter will switch back to Sub mode.
Upon switching back to Sub mode, the adapter listens for a command
for 15seconds before switching to Main mode again.
6.3 Modbus protocol
Parameter Value
Network 3 wire RS485
Mode Modbus RTU Slave
Baud rate 9600
Parity None
Stop bits 1
Register Base 0
6.3.1 Modbus address range
Set the Modbus address range (0~63) with the DIP switch. See "3.1
Components" [4 7] for the location of the LEDs on the PCB.
See "10.1 Modbus addresses" [4 36] for an overview of all Modbus
address DIP switch combinations.