IntesisBox ME-AC-MBS-1 Manuel utilisateur

IntesisBox®

ME-AC-MBS-1 v.2.1

Modbus RTU (EIA-485) Interface for Mitsubishi Electric air

conditioners. Compatible with all models of Domestic & Mr.Slim

lines.

User Manual

Issue Date: 11/2017

r21 EN

Order Codes:

ME-AC-MBS-1: Modbus RTU Interface for Mitsubishi Electric air conditioners

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

2/18

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.

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

3/18

INDEX

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

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

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

2.2 Connection to the EIA-485 bus ............................................................................. 5

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 ...................................................... 10

4.3 DIP-switch Configuration Interface ...................................................................... 12

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

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

4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 15

5. Electrical and Mechanical features .......................................................................... 16

6. List of supported AC Unit Types. ............................................................................ 17

7. Error Codes ......................................................................................................... 18

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

4/18

1. Presentation

The ME-AC-MBS-1 interfaces allow a complete and natural

integration of Mitsubishi Electric air conditioners into Modbus RTU

(EIA-485) networks.

Compatible with all models of Domestic and Mr.Slim line. Check the

section 6 for 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 ME-AC-MBS-1 devices can

be connected on the same network.

ME-AC-MBS-1 is a Modbus slave device.

•Direct connection to the AC indoor unit. Up to 1 AC indoor units can be connected to ME-AC-

MBS-1. 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 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, 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

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

5/18

2. Connection

The interface comes with a specific cable and connectors 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

To connect the ME-AC-MBS-1 interface with the AC indoor unit you must follow these steps:

Disconnect Mains Power from the AC unit. Open the front cover of the indoor unit to have

access to the electronic circuit. Once you arrive at the electronic circuit, locate the socket

connector marked as CN105.

Take the cable that comes with the interface, insert one of its connectors (the one installed in

the shortest uncovered part) into the socket of the ME-AC-MBS-1, and the other connector (the

one installed in the largest uncovered part) to the socket CN105 of the AC unit's electronic

circuit. You can place the ME-AC-MBS-1 inside or outside the AC indoor unit depending on your

needs. Remember that the ME-AC-MBS-1 must also be connected to the Modbus RTU EIA-485

network. Close the AC indoor unit's front cover again to finish the connection.

Do not modify the length of the cable supplied with the interface, it may affect the correct

interface’s operation.

2.2 Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block of ME-AC-MBS-1 (the one with two

poles) 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).

CN105

AC indoor unit

Electronic control board

200 mm / 7.9”

40 mm / 1.6”

Connection cable

provided with the

interface

90 mm / 3.5”

IntesisBox®

ME-AC-MBS-1

EIA485

A B

AC Unit

53 mm / 2.1”

Use this hole to

attach the cable

using the staple

and the screw

provided with the

interface

For wall mounting,

extract the upper and

lower staples until

you listen the "click".

Fixing screw

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

6/18

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 above and by the AC unit manufacturer).

3. Connect the connection cable included with the interface between the interface and the

AC indoor unit following the instructions of the diagram.

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

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.

SW3

SW4

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

7/18

4. Modbus Interface Specification

4.1 Modbus physical layer

ME-AC-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

(protocol address)

(PLC address)

R/W

Description

R/W

AC unit On/Off

▪0:Off

▪1:On

R/W

AC unit Mode 1

▪0:Auto

▪1:Heat

▪2:Dry

▪3:Fan

▪4:Cool

R/W

AC unit Fan Speed 1

▪0:Auto

▪1:Low

▪2:Mid-1

▪3:Mid-2

▪4:High

R/W

AC unit Vane Position 1

▪0:Auto

▪1:Horizontal

▪2:Position-2

▪3:Position-3

▪4:Position-4

▪Vertical

▪Swing

R/W

AC unit Temperature Setpoint 1,2,3

▪-32678 (Initialization value)

▪16..32ºC (ºC/x10ºC)

▪61..90ºF

AC unit Temperature reference 1,2,3

▪-32678 (Initialization value)

▪10..38ºC (ºC/x10ºC)

▪50..100ºF

Available values will depend on the AC unit mode. Check the AC unit model functions in its User’s Manual to know the possible values

for this register.

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

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

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

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info@intesisbox.com

+34 938047134

8/18

(protocol address)

(PLC address)

R/W

Description

R/W

Window Contact

▪0: Closed (Default)

▪1: Open

R/W

ME-AC-MBS-1 Disablement 4

▪0: ME-AC-MBS-1 enabled (Default)

▪1: ME-AC-MBS-1 disabled

R/W

AC Remote Control Disablement 4

▪0: Remote Control enabled (Default)

▪1: Remote Control disabled

R/W

AC unit Operation Time 4

▪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 5

▪0: No error present

▪65535 (-1 if it is read as signed value):

Status of AC error has not been obtained yet

(initialization value).

Error in the communication of ME-AC-MBS-1

with the AC unit.

▪Any other error present, see the table at the

end of this document.

R/W

Indoor unit’s ambient temperature from

external sensor (at Modbus side) 6

▪-32768: Default value. No temperature is

being provided from an external sensor.

▪Any other: (ºC/x10ºC/ºF)

AC Real setpoint temperature 1,2,3,6

▪When no external temperature is provided,

this read-only register will have the same

value as register 5 (PLC address). In all

cases, it will show the current setpoint in the

indoor unit.

▪16..32ºC (ºC/x10ºC)

▪60..90ºF

R/W

Block Periodic Sendings 4,7,8

▪0: Non-blocked (Default value)

▪1: Blocked

This value is stored in non-volatile memory

See section 7 for possible error codes and their explanation

See section 4.2.3 for more information

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

This register applies to firmware version 2.1 onwards

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

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info@intesisbox.com

+34 938047134

9/18

4.2.2 Configuration Registers

(protocol address)

(PLC address)

R/W

Description

R/W

AC Model

R/W

“Open Window” switch-off timeout 9

▪0..30 (minutes)

▪Factory setting: 30 (minutes)

Modbus RTU baud-rate

▪2400bps

▪4800bps

▪9600bps (Default)

▪19200bps

▪38400bps

▪57600bps

▪76800bps

▪115200bps

Device's Modbus Slave address

▪1..63

Max number of fan speeds

▪Value depending on position of SW1-P4

Device ID: 0x0500

Software version

Once window contact is open, a count-down to switch off the AC Unit will start from this configured value.

ME-AC-MBS-1

User’s Manual r21 EN

This information is subject to change without notice

IntesisBox®is a registered trademark of Intesis Software SLU

URL

Phone

http://www.intesisbox.com

info@intesisbox.com

+34 938047134

10/18

4.2.3 Considerations on Temperature Registers

•AC unit temperature setpoint (R/W)

(register 4 –in Protocol address / register 5 –in PLC address):

This is the adjustable temperature setpoint value that must be required by the User. This

Remote Controller connected to the Mitsubishi indoor unit will report the same

temperature setpoint value as this register. This will apply when no AC unit’s external

reference temperature is provided from ME-AC-MBS-1 (see details for register 22/23

below).

•AC unit temperature reference (R)

(register 5 –in Protocol address / register 6 –in PLC address):

This register reports the temperature that is currently used by the Mitsubishi indoor unit

as the reference of its own control loop. Depending on the configuration of the indoor

unit, this value can be the temperature reported by the sensor on the return path of the

Mitsubishi indoor unit or the sensor of its Remote Controller. It is a read-only register

(Modbus functions 3 or 4).

•AC unit external temperature reference (R/W)

(register 22 –in Protocol address / register 23 –in PLC address):

This register allows us to provide an external temperature’s sensor from the Modbus

side. Mitsubishi indoor unit does not allow, on devices like ME-AC-MBS-1, to provide

directly a temperature to be used as a reference of the control loop of the AC indoor

unit. In order to overcome this limitation and enable the usage of an external

temperature sensor (e.g. from Modbus side), ME-AC-MBS-1 applies the following

mechanism (only if “external temperature’s reference” is being used):

oAfter a couple of values have been entered in the “AC unit external temperature’s

reference” (register 22/23) and the “AC unit temperature set point” (register

4/5), ME-AC-MBS-1 calculates the corresponding temperature’s demand (e.g., if

a “temperature setpoint (register 4/5)” of 22ºC, and an “external temperature

reference (register 22/23)” of 20ºC are entered, ME-AC-MBS-1 will assume that

the user is demanding a +2ºC increase in temperature).

oBy knowing at any time the ambient temperature currently used by the indoor

unit to control its own operation (register 5/6), ME-AC-MBS-1 can calculate the

required temperature setpoint needed to apply the decrease/increase on the real

temperature and reach the temperature chosen by the user (following the

example above, if ME-AC-MBS-1 reads an “ambient temperature” (register 5/6)

of 24ºC in the indoor unit, it will apply a final setpoint of 24ºC + 2ºC = 26ºC).

oAt this moment, each time that ME-AC-MBS-1 detects a change on the ambient

temperature reported by the indoor unit (register 5/6), it will also change the

required setpoint, in order to keep the temperature required by the user at any

time. If we follow the last example, when ME-AC-MBS-1 receives a new

temperature´s value coming from the indoor unit of 25ºC, ME-AC-MBS-1 will

automatically adjust the temperature setpoint required of the AC indoor unit to

25ºC + 2ºC = 27ºC).

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