IntesisBox DK-RC-MBS-1, DK-AC-MBS-1 User Manual

IntesisBox

®

DK-RC-MBS-1 v.1.6

Modbus RTU (EIA-485) Interface for Daikin air conditioners.
Compatible with VRV and SKY line air conditioners commercialized
by Daikin.

User Manual

Issue Date: 12/2017

r3.3 EN

Order Codes:

DK-RC-MBS-1: Modbus RTU Interface for Daikin air conditioners

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

URL
Email
Phone

http://www.intesisbox.com
[e-mail]
[phone]

2/23

© Intesis Software S.L.U. 2017. All Rights Reserved.

Information in this document is subject to change without notice. No part of this publication
may be reproduced, stored in a retrieval system or transmitted in any form or any means
electronic or mechanical, including photocopying and recording for any purpose other than the
purchaser’s personal use without the written permission of Intesis Software S.L.U.

Intesis Software S.L.U.
Milà i Fontanals, 1 bis
08700 Igualada
Spain

TRADEMARKS
All trademarks and tradenames used in this document are acknowledged to be the copyright of
their respective holders.

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

URL
Email
Phone

http://www.intesisbox.com
[e-mail]
[phone]

3/23

INDEX

1. Presentation .......................................................................................................... 4

2. Connection ............................................................................................................ 5

2.1 Connect to the AC indoor unit ............................................................................... 5

2.2 Connection to the EIA-485 bus ............................................................................. 6

3. Quick Start Guide ................................................................................................... 6

4. Modbus Interface Specification ................................................................................ 7

4.1 Modbus physical layer.......................................................................................... 7

4.2 Modbus Registers ................................................................................................ 7

4.2.1 Control and status registers ........................................................................... 7

4.2.2 Configuration Registers.................................................................................. 9

4.2.3 Considerations on Temperature Registers ........................................................ 9

4.3 DIP-switch Configuration Interface ...................................................................... 11

4.4 Implemented Functions ..................................................................................... 15

4.5 Device LED indicator ......................................................................................... 15

4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 16

5. Electrical and Mechanical features .......................................................................... 17

6. List of supported AC Unit Types. ............................................................................ 18

7. Error Codes ......................................................................................................... 19

8. Annex 1: Master/Slave of Operation Mode ............................................................... 23

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

URL
Email
Phone

http://www.intesisbox.com
[e-mail]
[phone]

4/23

1. Presentation

The DK-RC-MBS-1 interfaces allow a complete and natural
integration of Daikin air conditioners into Modbus RTU (EIA-

485) networks.

Compatible with all SKY Air and VRV models commercialized
by Daikin. Check the Section 6 to obtain more information.

Reduced dimensions. 93 x 53 x 58 mm

3.7” x 2.1” x 2.3”

• Quick and easy installation.

Mountable on DIN rail, wall, or even inside the indoor unit on some models of AC.

• External power not required.

• Direct connection to Modbus RTU (EIA-485) networks. Up to 63 DK-RC-MBS-1 devices can

be connected in the same network.

DK-RC-MBS-1 is a Modbus slave device.

• Direct connection to the AC indoor unit. Up to 16 AC indoor units can be connected to DK-

RC-MBS-1, controlling them as one (not individually).

• Configuration from both on-board DIP-switches and Modbus RTU.

• Total Control and Supervision.

• Real states of the AC unit's internal variables.

• Allows simultaneous use of the AC’s remote controls and Modbus RTU.

* Up to 63 IntesisBox devices can be installed in the same Modbus RTU bus. However, depending on the configured speed, the

installation of Modbus Repeaters may be required

• SCADA

• PLC

• DDC

• BMS

• HMI

• Controller

• etc

Up to 63
AC indoor
units*

Modbus RTU
EIA-485 network

Modbus RTU

Master

device

DK-RC-MBS-1

DK-RC-MBS-1
DK-RC-MBS-1

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

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Email
Phone

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5/23

Connection to
P1P2 bus. Two
wire cable.

90 mm / 3.5”

53 mm / 2.1”

53 mm / 2.1”

90 mm

3.5”

2. Connection

The interface comes with a plug-in terminal block of 2 poles to establish direct connection with
the AC indoor unit. It comes as well with a plug-in terminal block of 2 poles to establish direct
connection with the Modbus RTU EIA-485 network.

2.1 Connect to the AC indoor unit

The DK-RC-MBS-1 connects directly to the Daikin P1P2 Bus, which is not provided within the
interface. Depending on which controllers are available, the recommended connection’ methods
are the following ones (details in Figure 2. 1):

• Wired remote control available. Connect the gateway as Slave in parallel with the

wired remote controllers (Controller acts as Master).

• Infrared remote control available. Connect the gateway as Master in parallel with the

infrared remote controller (Infrared Remote Control as Slave).

• No remote control available Connect the gateway directly to the P1P2 bus of the

indoor unit as Master when there is no Daikin Remote Controller.

Maximum P1 P2 bus length is 500 meters / 1,640.42 ft . The bus has no polarity sensitivity.

AC Indoor Unit

IntesisBox®

DK-RC-MBS-1

MODBUS

RTU

EIA-485

Bus

EIA485

A+ B-

P1 P2

For wall mounting
extract the upper
and lower staples
until you hear the
"click".

P1 P2

DAIKIN

Internal
electronic
control

Remote Controller

P2
P1

IntesisBox®

DK-RC-MBS-1

MODBUS

RTU

EIA-485

Bus

EIA485

A+ B-

P1 P2

AC Indoor Unit

Internal
electronic
control

Connection to P1P2
bus. Two wire cable.

P2
P1

Max. 500m / 1,640.42 ft

Max. 500m / 1,640.42 ft

Figure 2. 1 DK-RC-MBS-1 Connection diagrams

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

URL
Email
Phone

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2.2 Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block (the one of two poles) of DK-RC­MBS-1 and keep the polarity on this connection (A+ and B-). Make sure that the maximum
distance to the bus is 1,200 meters (3,937 ft). Loop or star typologies are not allowed in the
case of the EIA-485 bus. A terminator resistor of 120Ω must be present at each end of the bus
to avoid signal reflections. The bus needs a fail-safe biasing mechanism (see section 4.6 for
more details).

3. Quick Start Guide

1. Disconnect the air conditioning from the Mains Power.

2. Attach the interface next to the AC indoor unit (wall mounting) following the instructions

of the diagram below or install it inside the AC indoor unit (respect the safety
instructions given).

3. Connect the P1P2 bus between the interface and the AC indoor unit following the

instructions of the diagram. Screw each bare cable end in the corresponding P1P2
terminals of each device.

4. Connect the EIA-485 bus to the connector EIA485 of the interface.

5. Close the AC indoor unit.

6. Check the DIP-Switch configuration of the IntesisBox interface and make sure it matches

the current installation’s parameters (see section 4.3).

By default, the interface is set to:

▪ Modbus Slave Address  1
▪ Modbus baud rate  9600 bps

These parameters can be modified from SW4 and SW3 DIP-Switches.

All other switch positions are set at low level (Off position ) by default.

NOTE: All changes on the DIP-Switch configuration require a system power cycle to be
applied.

7. Connect the AC system to Mains Power.

IMPORTANT: The IntesisBox interface requires to be connected to the AC unit
(powered) to start communicating.

ON

ON

SW3

SW4

DK-RC-MBS-1

User’s Manual r3.3 EN

© Intesis Software S.L.U. - All rights reserved

This information is subject to change without notice

IntesisBox® is a registered trademark of Intesis Software SLU

URL
Email
Phone

http://www.intesisbox.com
[e-mail]
[phone]

7/23

4. Modbus Interface Specification

4.1 Modbus physical layer

DK-RC-MBS-1 implements a Modbus RTU (Slave) interface, to be connected to an EIA-485 line.
It performs 8N2 communication (8 data bits, no parity and 2 stop bit) with several available
baud rates (2400 bps, 4800 bps, 9600 bps -default-, 19200 bps, 38400 bps, 57600 bps, 76800
bps and 115200 bps). It also supports 8N1 communication (8 data bits, no parity and 1 stop
bit).

4.2 Modbus Registers

All registers are type “16-bit unsigned Holding Register” and they use the standard Modbus big
endian notation.

4.2.1 Control and status registers

Register Address

(protocol address)

Register Address

(PLC address)

R/W

Description

0

1

R/W

AC unit On/Off

▪ 0: Off
▪ 1: On

1

2

R/W

AC unit Mode 1

▪ 0: Auto
▪ 1: Heat
▪ 2: Dry
▪ 3: Fan
▪ 4: Cool

2

3

R/W

AC unit Fan Speed 1

▪ 1: Low
▪ 2: Mid
▪ 3: High

3

4

R/W

AC unit Vane Position 1

▪ 1: Position-1 (Horizontal)
▪ 2: Position-2 (Horizontal)
▪ 3: Position-3 (Medium)
▪ 4: Position-4 (Vertical)
▪ 5: Position-5 (Vertical)
▪ 10: Swing

4

5

R/W

AC unit Temperature Setpoint

1,2,3

▪ -32768 (Initialization value)
▪ 16..31ºC (ºC/x10ºC)
▪ 61..92ºF

5

6

R

AC unit Temperature reference

1,2,3

▪ -32768 (Initialization value)
▪ 10..38ºC (ºC/x10ºC)
▪ 50..100ºF

1

Available values will depend on the AC unit mode. Check the AC unit model functions in its user manual to know the possible v alues for

this register.

2

Magnitude for this register can be adjusted to Celsius x 1ºC, Celsius x 10ºC (default) or Fahrenheit. See section 4.2.3 for more

information.

3

It is not possible turn to x10 the value shown in Fahrenheit.