IntesisBox MH-RC-MBS-1 User manual

IntesisBox®
MH-RC-MBS-1 v.0.14
Modbus RTU (EIA-485) Interface for Mitsubishi Heavy Industries air
conditioners.
User Manual
Issue Date: 04/2019
r6.3 EN
Order Codes:
MH-RC-MBS-1: Modbus RTU Interface for Mitsubishi Heavy Industries air conditioners

MH-RC-MBS-1
User’s Manual r6.3 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. 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.

MH-RC-MBS-1
User’s Manual r6.3 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................................................................................ 10
4.2.3 Considerations on Temperature Registers ...................................................... 11
4.2.4 Special behavior –Center/Remote ................................................................ 13
4.3 DIP-switch Configuration Interface ...................................................................... 15
4.4 Implemented Functions ..................................................................................... 18
4.5 Device LED indicator.......................................................................................... 18
4.6 EIA-485 bus. Termination resistors and Fail Safe Biasing mechanism ...................... 19
5. Mechanical and electrical features .......................................................................... 20
6. List of supported AC Unit Types. ............................................................................ 21
7. Error Codes......................................................................................................... 22

MH-RC-MBS-1
User’s Manual r6.3 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 MH-RC-MBS-1 interfaces allow a complete and natural
integration of Mitsubishi Heavy Industries air conditioners
into Modbus RTU (EIA-485) networks.
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 of AC.
•External power not required.
•Direct connection to Modbus RTU (EIA-485) networks. Up to 63 MH-RC-MBS-1 devices can
be connected in the same network.
MH-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 MH-
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
MH-RC-MBS-1
MH-RC-MBS-1
MH-RC-MBS-1

MH-RC-MBS-1
User’s Manual r6.3 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]
5/23
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 MH-RC-MBS-1 connects directly to the Mitsubishi Heavy Industries XY 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 controller available. Connect the gateway as Slave in parallel with the
wired remote controllers (Controller acts as Master).
•No remote controller available Connect the gateway directly to the XY bus of the
indoor unit as Master when there is no Mitsubishi Heavy Industries Remote Controller.
Maximum XY bus length is 600 m / 1,968.5 ft. The bus has no polarity sensitivity.
Important: If a wired remote controller of the AC manufacturer is connected in the same bus,
communication may shut down.
IntesisBox®
MH-RC-MBS-1
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
X Y
AC Unit
AC Indoor Unit
Max. 600 m / 1,968.5 ft
Connection to XY bus.
Two wire cable.
Y
X
AC Indoor Unit
IntesisBox®
MH-RC-MBS-1
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
X Y
AC Unit
53 mm / 2.1”
For wall mounting
extract the upper
and down staples
until you hear the
"click".
X Y
MHI
Max. 600 m / 1,968.5 ft
Remote Controller
Y
X
90 mm / 3.5”
Connection to XY bus.
Two wire cable.
53 mm / 2.1”
90 mm / 3.5”
Figure 2. 1 MH-RC-MBS-1 connection diagram
Internal
electronic
control
board
Internal
electronic
control
board

MH-RC-MBS-1
User’s Manual r6.3 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]
6/23
2.2 Connection to the EIA-485 bus
Connect the EIA-485 bus wires to the plug-in terminal block of MH-RC-MBS-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 120Ωmust 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 XY bus between the interface and the AC indoor unit following the
instructions of the diagram. Screw each bare cable end in the corresponding XY
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.
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

MH-RC-MBS-1
User’s Manual r6.3 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
MH-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 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
▪0: Auto
▪1: Heat
▪2: Dry
▪3: Fan
▪4: Cool
2
3
R/W
AC unit Fan Speed 1,2
Num. of Fan Speeds
Value
4
(Default)
3
2
1
0
Auto
1
Low
Low
Low
High
2
Mid
Mid
High
-
3
High
High
-
-
4
Powerful
-
-
-
3
4
R/W
AC unit Vane Position 2
▪1: Position-1
▪2: Position-2
▪3: Position-3
▪4: Position-4
▪10: Swing
1
Configuration following the Table 4.1 of this document
2
Available values will depend on the AC unit mode. Check the AC unit model functions in its User Manual to know the possible values for
this register.

MH-RC-MBS-1
User’s Manual r6.3 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]
8/23
Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
4
5
R/W
AC unit Temperature Setpoint 2,3,4
▪-32768 (Initialization value)
ALL MODES (EXCEPT HEAT)
▪18..30ºC (ºC/x10ºC)
▪64..86ºF
HEAT
▪16..30ºC (ºC/x10ºC)
▪61..61ºF
5
6
R
AC unit Temperature reference 2,3,4
▪-32768 (Initialization value)
▪10..38ºC (ºC/x10ºC)
▪50..100ºF
6
7
R/W
Window Contact
▪0: Closed (Default)
▪1: Open
7
8
R/W
MH-RC-MBS-1 Disablement 5
▪0: MH-RC-MBS-1 enabled (Default)
▪1: MH-RC-MBS-1 disabled
8
9
R/W
AC Remote Control Disablement 5
▪0: Remote Control enabled (Default)
▪1: Remote Control disabled
9
10
R/W
AC unit Operation Time
▪0..65535 (hours). Counts the time the AC
unit is in “On” state.
10
11
R
AC unit Alarm Status
▪0: No alarm condition
▪1: Alarm condition
11
12
R
Error Code 6
▪0: No active error
▪65532 (-4): Initialization process (around
2min) before normal operation starts. This
error appears in case that MH-RC-MBS-1 is
set as Master.
▪65535 (-1): Error in the communication of
MH-RC-MBS-1 or Remote Controller with the
AC unit.
▪Any other error present, see the table at the
end of this document.
22
23
R/W
Indoor unit´s ambient temperature from
external sensor (at Modbus side) 2,3,4,7
▪-32768: (Initialization value). No
temperature is being provided from an input
sensor. There’s no input sensor.
▪Any other: (ºC/x10ºC/ºF)
3
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.
4
It is not possible turn to x10 the value shown in Fahrenheit.
5
This value is stored in non-volatile memory
6
See section 7 for possible error codes and their explanation
7
See section 4.2.3 for more information

MH-RC-MBS-1
User’s Manual r6.3 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]
9/23
Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
23
24
R
AC Real temperature setpoint 2,3,4,7
▪When the mechanism for “Virtual
temperature” is not being applied, the value
will be the one in the register 5 (PLC
addressing).
▪16..31ºC (ºC/x10ºC)
▪60..90ºF
24
25
R
Current AC max setpoint 2,3,4
▪-32768 (Initialization value)
▪Ranges are specific from Manufacturer
25
26
R
Current AC min setpoint 2,3,4
▪-32768 (Initialization value)
▪Ranges are specific from Manufacturer
31
32
R
Status (feedback)
▪0: Not active (Default value)
▪1: Active (A window is open)
46
47
R
Center/Remote 8
▪0: Remocon unlock (Center/Remote)
▪1: Remocon lock On/Off (Center)
▪2: Remocon lock All (Center)
▪3: Remocon Only (Remote)
55
56
R/W
Under voltage counter 5
▪0..300(hours)
60
61
R
Outdoor Intake temperature 2,3,4
▪-32768d: (Initialization value)
No temperature’s value is being provided
outdoor. No virtual temperature is applied.
▪Any other: (ºC/x10ºC/ºF)
65
66
R
Input reference temperature 2,3,4
▪-32768: (Initialization value). No
temperature’s value is being provided from
an external sensor. No virtual temperature is
applied.
▪Any other: (ºC/x10ºC/ºF)
66
67
R
Return Path temperature 2,3,4
▪-32768 (Initialization value)
▪Any: (ºC/x10ºC/ºF)
97
98
R/W
Block Periodic Sendings 5,9,10
▪0: Non-blocked (Default value)
▪1: Blocked
98
99
R/W
Master/Slave (gateway)
▪0: Slave
▪1: Master
8
See section 4.2.4 for more information
9
If the register is configured as “0:Non-blocked”, all commands received from Modbus will be sent to the AC system. If “1: Blocked”,
commands from Modbus will only be sent to the AC system if they differ from the previous value.
10
This register applies to firmware version 0.14 onwards

MH-RC-MBS-1
User’s Manual r6.3 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]
10/23
4.2.2 Configuration Registers
Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
13
14
R/W
“Open Window” switch-off timeout 11
▪0..30 (minutes)
▪Factory setting: 30 (minutes)
14
15
R
Modbus RTU baud-rate
▪2400bps
▪4800bps
▪9600bps (Default)
▪19200bps
▪38400bps
▪57600bps
▪76800bps
▪115200bps
15
16
R
Modbus Slave Address
▪1..63
21
22
R
Max number of fan speeds
45
46
W
Error reset
▪1: Reset
48
49
R
Switch value
49
50
R
Device ID: 0x0F00
50
51
R
Software version
81
82
R
Error address
▪Provides the indoor unit number which is
providing error
99
100
W
Reset
▪1: Reset
While the initialization is ongoing, some Modbus registers will indicate an undetermined value.
Once the normal operation starts, they will acquire its corresponding value. It is important to
keep in mind that any change done during the initialization process will not have effect until it
has been finished.
11
Once window contact is open, a count-down to switch off the AC Unit will start from this configured value.