1. No category

IntesisBox® DK-AC-MBS-1
IntesisBox
User’s Manual r1.2 eng
®
DK-AC-MBS-1
v.0.4
MODBUS RTU (RS-485) Interface for Daikin air conditioners.
Compatible with Domestic line models
User Manual
Issue Date: 09/2014
Order Codes:
DK-AC-MBS-1: Modbus RTU Interface for Daikin air conditioners
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
© Intesis Software S.L. 20014. 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.
Intesis Software S.L.
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.
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
INDEX
1.
Presentation .................................................................................................... 4
2.
Connection ...................................................................................................... 5
2.1
Connect to the AC indoor unit ......................................................................... 5
2.2
Connection to the RS485 bus .......................................................................... 5
3.
Modbus Interface Specification ........................................................................... 6
3.1
Modbus physical layer .................................................................................... 6
3.2
Modbus Registers .......................................................................................... 6
3.2.1
Control and status registers ...................................................................... 6
3.2.2
Configuration Registers ............................................................................ 7
3.3
DIP-switch Configuration Interface .................................................................. 8
3.4
Implemented Functions .................................................................................. 9
3.5
Device LED indicator .................................................................................... 10
3.6
RS485 bus. Termination resistors and Fail Safe Biasing mechanism ................... 10
4.
Specifications................................................................................................. 12
5.
List of supported AC Unit Types ........................................................................ 12
5.1
Error Codes ................................................................................................ 13
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
1. Presentation
The DK-AC-MBS-1 interface allows a complete and natural integration
of Daikin air conditioners into Modbus RTU (RS-485) networks.
Compatible with Domestic line models. Check section 5 for more
information.


Reduced dimensions. 93 x 53 x 58 mm.
Quick and easy installation.
Mountable on DIN rail, wall, or even inside the indoor unit in some models of AC.


External power not required.
Direct connection to MODBUS RTU (RS-485) networks.
DK-AC-MBS-1 is a Modbus slave device.

Direct connection to the AC indoor unit.
The cable for this connection is also supplied.

Configuration from both on-board DIP-switches and MODBUS RTU.

Total Control and Supervision.

Real states of the AC unit's internal variables.

Allows using simultaneously the IR remote control and MODBUS RTU.
Modbus RTU
RS485 network
Modbus RTU
master
device
DK-AC-MBS-1
Up to 63
AC indoor
units
DK-AC-MBS-1







SCADA
PLC
DDC
BMS
HMI
Controller
etc
DK-AC-MBS-1
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
2. Connection
The interface comes with cable + connectors for direct connection to the AC indoor unit, and
with a plug-in terminal block of 2 poles for connection to a Modbus RTU RS-485 network.
2.1
Connect to the AC indoor unit
To connect the DK-AC-MBS-1 interface to the AC indoor unit follow these steps:
Disconnect mains power from the AC unit. Open the front cover of the indoor unit in order
to have access to the electronic circuit. In the electronic circuit locate the socket connector
marked as:
S21
in Domestic line models
Using the cable that comes with the interface, insert one of its connectors, the biggest one,
into the socket of the DK-AC-MBS-1, and the other connector, the one installed in the
largest uncovered part, to the socket S21 of the AC unit's electronic circuit. Close the AC
indoor unit's front cover again.
Do not modify the length of the cable supplied with the interface, it may affect to the
correct operation of the interface.
Use this hole to fix the
cable using the staple
and screw provided
with the interface.
AC indoor unit
Electronic circuit board
S21
53 mm
Connection cable
supplied with the
interface.
AC Unit
IntesisBox®
90 mm
DK-AC-MBS-1
RS485
A
B
Modbus RTU
RS485
Bus
2.2
Connection to the RS485 bus
Connect the RS485 bus wires to the plug-in terminal block (the one of two poles) of DK-ACMBS-1, respect the polarity on this connection (A+ and B-). Respect the maximum distance
of 1.200 meters for the bus, no loop or star topologies are allowed for RS485 bus, a
terminator resistor of 120 must be present at each end of the bus to avoid signal
reflections and also a fail-safe biasing mechanism (see section 3.6 for more details).
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
3. Modbus Interface Specification
3.1
Modbus physical layer
DK-AC-MBS-1 implements a MODBUS RTU (slave) interface, to be connected to an RS-485
line. It performs an 8N2 (8N1-compatible) communication (8 data bits, no parity and 1 or 2
stop bit) with several available baudrates (2400 bps, 9600 bps -default-, 19200 bps and
57600 bps).
3.2
Modbus Registers
All registers are of type “16-bit unsigned Holding Register”, in standard ModBus’ big endian
notation.
3.2.1 Control and status registers
Register Address
(protocol address)
Register Address
(PLC address)
R/W
0
1
R/W
Description
AC unit On/Off


0: Off
1: On
AC unit Mode1
1
2
R/W





0:
1:
2:
3:
4:
Auto
Heat
Dry
Fan
Cool
AC unit Fan Speed1
2
3
1
2
3
3
4
R/W
R/W
4
5
R/W
6
7
R/W
7
8
R/W
8
9
R/W





0:
1:
2:
3:
4:
Auto
Low
Mid-1
Mid-2
High
AC unit Up/Down Vane Position1


0: Auto
10: Swing
AC unit Temperature Setpoint1,2


16..31 (ºC)
61..90 (ºF)
Window Contact


0: Closed
1: Open
DK-AC-MBS-1 Control disablement3

0: AC control enabled

1: AC control disabled
AC’s Remote Control Disablement3

0: Remote Control enabled

1: Remote Control disabled
See Section 5 for detail on indoor unit model differences and function availability
Magnitude for this register can be adjusted to Celsius (default) or Fahrenheit through DIP switch P5
This value is stored in non-volatile memory
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IntesisBox® DK-AC-MBS-1
Register Address
(protocol address)
Register Address
(PLC address)
User’s Manual r1.2 eng
R/W
9
10
R/W
10
11
R
11
12
R
26
27
R/W
Description
AC unit Operation Time4

0..65535 (hours). Counts the time the
AC unit is in “On” state.
AC unit Alarm Status


0: No alarm condition
1: Alarm condition
Error Code. Details in section 5.1
AC unit Left/Right Vane Position1


0: Auto
10: Swing
AC Humidification Value
28
29
R/W
Register Address
(PLC address)
R/W





0: Off
1: Low Humidification
2: Medium Humidification
3: High Humidification
10: Continuous
3.2.2 Configuration Registers
Register Address
(protocol address)
13
14
R/W
Description
“Open Window” switch-off timeout5, 4


0..30 (minutes)
Factory setting: 30 (minutes)
Modbus RTU baud-rate6, 4
14
15
R





2400 bps
4800 bps
9600 bps
19200 bps
Factory setting: (9600 bps)
Device's Modbus slave address6, 3
4
5
6
15
16
R
21
22
R
49
50
R
50
51
R


1..63
Factory setting: 0 (no address /
configured at DIP-switch)
Max number of fan speeds
 Value is always 5
Device definition:
 0x700 (DK-AC-MBS-1)
Software version
This value is stored in non-volatile memory
Once window contact is open, a count-down to switch off the AC Unit will start from this configured value
This value is set-up from device’s on-board DIP-switches. See Section 3.3
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IntesisBox® DK-AC-MBS-1
3.3
User’s Manual r1.2 eng
DIP-switch Configuration Interface
All configuration values on DK-AC-MBS-1 can be written and read from ModBus interface.
Though, some of them can also be setup from its on-board DIP-switch interface.
They are DIP-switches P5, P6* and P7 on the device, in the following location:
P6*
P6*
ON 1 2 3 4
CABLE
FIXING
AC UNIT
* DIP-Switch P6 is
not used by current
version of DK-ACMBS-1
AC Unit
IntesisBox®
DK-AC-MBS-1
RS485
A B
ON 1 2 3 4 5 6 7 8
P7
ON 1 2 3 4
P5
P7
P7
P5
P5
The following table applies for configuration of the interface through these DIP-switches:
P7 – Modbus protocol: Slave address and baudrate
Add
Switches
1 2 3 4 5 6 7 8
Add
Switches
1 2 3 4 5 6 7 8
Add
Switches
1 2 3 4 5 6 7 8
Add
Switches
1 2 3 4 5 6 7 8
0
      x x
16
      x x
32
      x x
48
      x x
1*
      x x
17
      x x
33
      x x
49
      x x
2
      x x
18
      x x
34
      x x
50
      x x
3
      x x
19
      x x
35
      x x
51
      x x
4
      x x
20
      x x
36
      x x
52
      x x
5
      x x
21
      x x
37
      x x
53
      x x
6
      x x
22
      x x
38
      x x
54
      x x
7
      x x
23
      x x
39
      x x
55
      x x
8
      x x
24
      x x
40
      x x
56
      x x
9
      x x
25
      x x
41
      x x
57
      x x
10
      x x
26
      x x
42
      x x
58
      x x
11
      x x
27
      x x
43
      x x
59
      x x
12
      x x
28
      x x
44
      x x
60
      x x
13
      x x
29
      x x
45
      x x
61
      x x
14
      x x
30
      x x
46
      x x
62
      x x
15
      x x
31
      x x
47
      x x
63
      x x
Table 3.1 P7: Modbus Slave address
*
Default value
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
Binary
value
b0…b8
Decimal value
Switches
1 2 3 4 5 6 7 8
xxxxxx00
0
x x x x x x  
2400bps
xxxxxx10
1
x x x x x x  
4800bps
xxxxxx01
2
x x x x x x  
9600bps (- default value)
xxxxxx11
3
x x x x x x  
19200bps
Description
Table 3.2 P7: Modbus baud rate
P5 – Other: Degrees/Decidegress (x10), temperature magnitude (ºC/ºF) and EIA485
termination resistor
Binary
value
b0…b4
Decimal
value
Switches
1 2 3 4
Description
0xxx
0
 x x x
Temperature values in Modbus register are represented in degrees (x1)
(default value)
1xxx
1
 x x x
Temperature values in Modbus register are represented in decidegrees (x10)
x0xx
0
x x x
Temperature values in Modbus register are represented in Celsius degrees
(default value)
x1xx
1
x x x
Temperature values in Modbus register are represented in Fahrenheit degrees
xxx0
0
x x x 
EIA485 bus without termination resistor (default value)
xxx1
1
x x x 
Internal termination resistor of 120Ω connected to EIA485 bus**
Table 3.3 Temperature and termination configuration
3.4
Implemented Functions
DK-AC-MBS-1 implements the following standard MODBUS functions:

3: Read Holding Registers

4: Read Input Registers

6: Write Single Register

16: Write Multiple Registers (Although this function is allowed, the interface does not
allow write operations on more than 1 register with the same request, this means
that length field should always be 1 when using this function for writes)
Only in the interfaces connected at both ends of the bus must be activated the termination resistor. More
information in section 3.6
**
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IntesisBox® DK-AC-MBS-1
3.5
User’s Manual r1.2 eng
Device LED indicator
The device includes a LED indicator to signal its different possible operational states. In the
following table are presented the different indications it can perform and its meaning.
Device status LED indication
ON / OFF Period
Meaning
On power-up
LED pulse
ON for 5 seconds / OFF after
Device reset / power-up
During normal
operation
LED flashing
200ms ON / 2s OFF
Device correctly
configured and working
During normal
operation
LED OFF
OFF continuously
No Modbus slave address
configured
LED blinking
200ms ON / 200ms OFF
During normal
operation
3.6
Communication Error
with the AC unit
RS485 bus. Termination resistors and Fail Safe Biasing mechanism
RS485 bus requires a 120Ω terminator resistor at each end of the bus to avoid signal
reflections.
In order to prevent fail status detections by the receivers "listening" the bus when all the
transmitters outputs are in three-state (high impedance), it is also required a fail-safe
biasing mechanism. This mechanism provides a safe status (a correct voltage level) in the
bus when all the transmitters’ outputs are in three-state.
The DK-AC-MBS-1 device includes an on-board terminator resistor of 120Ω that can be
connected to the RS485 bus by using DIP-switch P5 (see below).
A fail safe biasing circuit has also been included in the board of DK-AC-MBS-1, it can be
connected to the RS485 bus by placing the internal jumpers JP2 and JP3 (see details
below).
This fail safe biasing of the RS485 bus must only be supplied by one of the devices
connected to the bus. As this fail safe biasing circuit also provides a termination resistance,
only one of both must be selected in the DK-AC-MBS-1 device, fail safe biasing (jumpers
JP2 and JP3 placed) or terminator resistor (DIP-switch P5 position 4 to ON).
The device providing fail safe biasing or terminator resistor should be the one connected at
one end of the bus. At the other end of the bus, if there is also a DK-AC-MBS-1 device,
select the 120Ω terminator resistor through DIP-switch P5, or if there is a master device not
providing internal 120Ω terminator resistor, connect an external 120Ω resistor in the bus
terminal block connection of such master device.
Some Modbus RTU RS485 master devices can provide also internal 120Ω terminator resistor
and/or fail safe biasing (consult the technical documentation of the master device connected
to the RS485 network in every case).
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
Location of jumpers and DIP-switches for RS485 bus Termination resistor or Fail Safe
Biasing selection:
CABLE
AC UNIT
FIXING
JP1
P5
ON
JP3: ON (jumper placed)
JP2: ON (jumper placed)
JP3
JP2
Fail safe biasing circuit
connected to the RS485 bus
1 2 3 4
ON 
OFF 
120Ω Terminator resistor
No resistor
CABLE
To access to internal jumpers
JP2 and JP3, extract the top
cover of the interface inserting
a small screw-driver or clip in
the holes located at both sides
of the cover.
AC UNIT
FIXING
AC Unit
IntesisBox®
DK-AC-MBS-1
RS485
A B
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IntesisBox® DK-AC-MBS-1
User’s Manual r1.2 eng
4. Specifications
Dimensions:
Weight:
Operating Temperature:
Stock Temperature:
Operating Humidity:
Stock Humidity:
Isolation voltage:
Isolation resistance:
Modbus Media:
93 x 53 x 58 mm
85 g
-40 . . . 85ºC
-40 . . . 85ºC
<95% RH, non-condensing
<95% RH, non-condensing
1000 VDC
1000 MΩ
Compatible with Modbus RTU - RS485 networks
LED
Indicator
AC Unit
connection
DIP
Switches
DIP
Switches
58 mm
RS485
Port
53 mm
93 mm
5. List of supported AC Unit Types
A list of Daikin indoor unit model references compatible with DK-AC-MBS-1 and their
available features can be found in:
http://www.intesis.com/pdf/IntesisBox_DK-AC-xxx-1_AC_Compatibility.pdf
© Intesis Software S.L. - All rights reserved
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IntesisBox® is a registered trademark of Intesis Software SL
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tel
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IntesisBox® DK-AC-MBS-1
5.1
User’s Manual r1.2 eng
Error Codes
Error
Code
Error in
Remote
Controller
0
17
18
19
20
21
22
23
24
25
26
27
28
30
31
32
33
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
N/A
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
AA
AH
AJ
AE
AF
C0
C3
C4
C5
C6
C7
C8
C9
CA
CH
CC
CJ
CE
CF
E0
E1
E3
E4
E5
E6
E7
E8
E9
EA
EH
EC
EJ
EE
EF
H0
H1
H2
H3
H4
H5
H6
H7
Error category
Error Description
DK-AC-MBS-1 No active error
External protection devices activated
Indoor unit PCB assembly failure
Interlock error for fan
Drain level system error
Temperature of heat exchanger (1) error
Temperature of heat exchanger (2) error
Fan motor locked, overload, over current
Swing flap motor error
Overcurrent of AC input
Electronic expansion valve drive error
Heater overheat
Dust collector error / No-maintenance filter error
Capacity setting error (indoor)
Shortage of water supply
Malfunctions of a humidifier system (water leaking)
Indoor Unit
Malfunctions in a sensor system
Sensor system of drain water error
Heat exchanger (1) (Liquid pipe) thermistor system error
Heat exchanger (1) (Gas pipe) thermistor system error
Sensor system error of fan motor locked, overload
Sensor system of swing flag motor error
Sensor system of over-current of AC input
Suction air thermistor error
Discharge air thermistor system error
Contamination sensor error
Humidity sensor error
Remote control thermistor error
Radiation sensor error
High pressure switch sensor
Protection devices activated
Outdoor uni9t PCB assembly failure
High pressure switch (HPS) activated
Low pressure switch (LPS) activated
Overload of inverter compressor motor
Over current of STD compressor motor
Overload of fan motor / Over current of fan motor
Over current of AC input
Electronic expansion valve drive error
Four-way valve error
Pump motor over current
Outdoor Unit Water temperature abnormal
(Site installed) Protection device activated
Malfunctions in a drain water
Ice thermal storage unit error
Malfunctions in a sensor system
Air temperature thermistor error
Sensor system of power supply error
High Pressure switch is faulty
Low pressure switch is faulty
Compressor motor overload sensor is abnormal
Compressor motor over current sensor is abnormal
Overload or over current sensor of fan motor is abnormal
© Intesis Software S.L. - All rights reserved
This information is subject to change without notice
IntesisBox® is a registered trademark of Intesis Software SL
URL
Email
tel
http://www.intesis.com
[email protected]
+34 938047134
13 / 15
IntesisBox® DK-AC-MBS-1
73
74
75
76
77
79
80
81
82
83
84
87
91
92
93
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
111
112
113
116
117
118
119
120
121
122
123
125
129
130
132
133
134
135
136
142
H8
H9
HA
HH
HC
HE
HF
F0
F1
F2
F3
F6
FA
FH
FC
FE
FF
J0
J1
J2
J3
J4
J5
J6
J7
J8
J9
JA
JH
JC
JE
JF
L0
L3
L4
L5
L6
L7
L8
L9
LA
LC
P0
P1
P3
P4
P5
P6
P7
PJ
145
U0
146
147
148
U1
U2
U3
149
U4
150
U5
151
U6
System
User’s Manual r1.2 eng
Sensor system of over-current of AC input
Outdoor air thermistor system error
Discharge air thermistor system error
Pump motor sensor system of over current is abnormal
Water temperature sensor system error
Sensor system of drain water is abnormal
Ice thermal storage unit error (alarm)
No.1 and No.2 common protection device operates.
No.1 protection device operates.
No.2 protection device operates
Discharge pipe temperature is abnormal
Temperature of heat exchanger(1) abnormal
Discharge pressure abnormal
Oil temperature is abnormally high
Suction pressure abnormal
Oil pressure abnormal
Oil level abnormal
Sensor system error of refrigerant temperature
Pressure sensor error
Current sensor error
Discharge pipe thermistor system error
Low pressure equivalent saturated temperature sensor system error
Suction pipe thermistor system error
Heat exchanger(1) thermistor system error
Heat exchanger(2) thermistor system error
Oil equalizer pipe or liquid pipe thermistor system error
Double tube heat exchanger outlet or gas pipe thermistor system error
Discharge pipe pressure sensor error
Oil temperature sensor error
Suction pipe pressure sensor error
Oil pressure sensor error
Oil level sensor error
Inverter system error
Temperature rise in a switch box
Radiation fin (power transistor) temperature is too high
Compressor motor grounded or short circuit, inverter PCB fault
Compressor motor grounded or short circuit, inverter PCB fault
Over current of all inputs
Compressor over current, compressor motor wire cut
Stall prevention error (start-up error) Compressor locked, etc.
Power transistor error
Communication error between inverter and outdoor control unit
Shortage of refrigerant (thermal storage unit)
Power voltage imbalance, open phase
Sensor error of temperature rise in a switch box
Radiation fin temperature sensor error
DC current sensor system error
AC or DC output current sensor system error
Total input current sensor error
Capacity setting error (outdoor)
Low pressure drop due to insufficient refrigerant or electronic
expansion valve error, etc.
Reverse phase, Open phase
Power voltage failure / Instantaneous power failure
Failure to carry out check operation, transmission error
Communication error between indoor unit and outdoor unit,
communication error between outdoor unit and BS unit
Communication error between remote control and indoor unit / Remote
control board failure or setting error for remote control
Communication error between indoor units
© Intesis Software S.L. - All rights reserved
This information is subject to change without notice
IntesisBox® is a registered trademark of Intesis Software SL
URL
Email
tel
http://www.intesis.com
[email protected]
+34 938047134
14 / 15
IntesisBox® DK-AC-MBS-1
152
U7
153
U8
154
U9
155
UA
156
UH
157
158
UC
UJ
159
UE
160
UF
209
210
211
212
213
214
217
219
220
221
222
223
224
226
227
228
229
241
242
243
244
245
258
259
260
261
262
263
267
268
269
339
345
347
349
65535
60
61
62
63
64
65
68
6A
6H
6C
6J
6E
6F
51
52
53
54
40
41
42
43
44
31
32
33
34
35
36
3A
3H
3C
M2
M8
MA
MC
N/A
User’s Manual r1.2 eng
Communication error between outdoor units / Communication error
between outdoor unit and ice thermal storage unit
Communication error between main and sub remote controllers (sub
remote control error) / Combination error of other indoor unit / remote
control in the same system (model)
Communication error between other indoor unit and outdoor unit in the
same system / Communication error between other BS unit and
indoor/outdoor unit
Combination error of indoor/BS/outdoor unit (model, quantity, etc.),
setting error of spare parts PCB when replaced
Improper connection of transmission wiring between outdoor and
outdoor unit outside control adaptor
Centralized address duplicated
Attached equipment transmission error
Communication error between indoor unit and centralized control
device
Failure to carry out check operation Indoor-outdoor, outdoor-outdoor
communication error, etc.
All system error
PC board error
Ozone density abnormal
Contamination sensor error
Indoor air thermistor system error
Outdoor air thermistor system error
HVU error (Ventiair dust-collecting unit)
Dumper system error
Door switch error
Replace the humidity element
Replace the high efficiency filter
Replace the deodorization catalyst
Simplified remote controller error
Fan motor of supply air over current or overload
Fan motor of return air over current / Fan motor of return air overload
Inverter system error (supply air side)
Inverter system error (return air side)
Others
Humidifying valve error
Chilled water valve error
Hot water valve error
Heat exchanger of chilled water error
Heat exchanger of hot water error
The humidity sensor of return air sensor
Outdoor air humidity sensor error
Supply air temperature sensor error
Return air temperature sensor error
Outdoor air temperature sensor error
Remote controller temperature sensor error
Water leakage sensor 1 error
Water leakage sensor 2 error
Dew condensation error
Centralized remote controller PCB error
Communication error between centralized remote control devices
Centralized remote control devices inappropriate combination
Centralized remote controller address setting error
DK-AC-MBS-1 Error in the communication of DK-AC-MBS-1device with the AC unit

In case you detect an error code not listed, contact your nearest Daikin technical support service.
© Intesis Software S.L. - All rights reserved
This information is subject to change without notice
IntesisBox® is a registered trademark of Intesis Software SL
URL
Email
tel
http://www.intesis.com
[email protected]
+34 938047134
15 / 15