Intesis INMBSTOS001R000 User guide

Compatible with Digital Inverter & VRF lines

USER MANUAL

Issue date: 04/2019 r2.7 ENGLISH

Intesis

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INMBSTOS001R000

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Modbus RTU (EIA-485) Interface for Toshiba air conditioners Compatible with Digital Inverter & VRF lines

ORDER CODE

LEGACY ORDER CODE

INMBSTOS001R000

TO-RC-MBS-1

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INMBSTOS001R000

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Important User Information

Disclaimer

The information in this document is for informational purposes only. Please inform HMS Industrial Networks of any inaccuracies or omissions found in this document. HMS Industrial Networks disclaims any responsibility or liability for any errors that may appear in this document.

HMS Industrial Networks reserves the right to modify its products in line with its policy of continuous product development. The information in this document shall therefore not be construed as a commitment on the part of HMS Industrial Networks and is subject to change without notice. HMS Industrial Networks makes no commitment to update or keep current the information in this document.

The data, examples and illustrations found in this document are included for illustrative purposes and are only intended to help improve understanding of the functionality and handling of the product. In view of the wide range of possible applications of the product, and because of the many variables and requirements associated with any particular implementation, HMS Industrial Networks cannot assume responsibility or liability for actual use based on the data, examples or illustrations included in this document nor for any damages incurred during installation of the product. Those responsible for the use of the product must acquire sufficient knowledge in order to ensure that the product is used correctly in their specific application and that the application meets all performance and safety requirements including any applicable laws, regulations, codes and standards. Further, HMS Industrial Networks will under no circumstances assume liability or responsibility for any problems that may arise as a result from the use of undocumented features or functional side effects found outside the documented scope of the product. The effects caused by any direct or indirect use of such aspects of the product are undefined and may include e.g. compatibility issues and stability issues.

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INMBSTOS001R000

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INDEX

1. Presentation .......................................................................................................... 5

2. Connection ............................................................................................................ 6

2.1 Connect to the AC indoor unit ............................................................................... 6

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

3. Quick Start Guide ................................................................................................... 7

4. Modbus Interface Specification ................................................................................ 8

4.1 Modbus physical layer.......................................................................................... 8

4.2 Modbus Registers ................................................................................................ 8

4.2.1 Control and status registers ........................................................................... 8

4.2.2 Configuration Registers................................................................................ 10

4.3 Modbus Registers for Advanced Functions ............................................................ 10

4.3.1 Advanced registers for Indoor Unit status ...................................................... 10

4.3.2 Advanced registers for Outdoor Unit Status on VRF-SMMSi Systems .................. 11

4.3.3 Advanced registers for Outdoor Unit Status on VRF-SHRM/SMMS Systems ...... 13

4.3.4 Advanced registers for Outdoor Unit Status on RAV Systems ............................ 14

4.3.5 Advanced registers for Indoor Unit Type and Refresh Time adjustment .............. 15

4.3.6 Considerations on Temperature Registers ...................................................... 16

4.4 DIP-switch Configuration Interface ...................................................................... 18

4.5 Implemented Functions ..................................................................................... 21

4.6 Device LED indicator ......................................................................................... 21

4.7 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 22

5. Electrical and Mechanical features .......................................................................... 23

6. List of supported AC Unit Types. ............................................................................ 24

7. Error Codes ......................................................................................................... 25

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1. Presentation

The INMBSTOS001R000 interfaces allow a complete and natural

integration of Toshiba air conditioners into Modbus RTU (EIA-485) networks.

Compatible with Digital Inverter & VRF lines.

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 INMBSTOS001R000 devices

can be connected in the same network.

INMBSTOS001R000 is a Modbus slave device.

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

INMBSTOS001R000, 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 Intesis 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

INMBSTOS001R000

INMBSTOS001R000 INMBSTOS001R000

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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 INMBSTOS001R000 connects directly to the Toshiba AB Bus, which is not provided within the interface. The recommended connection’ methods are the following ones (details in Figure

2. 1):

• Wired remote control available.

• No remote control available

Maximum AB bus length is 500 m / 1,640.42 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.

2.2 Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block of INMBSTOS001R000 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 4.7 for more details).

Max 500 m / 1,640.42 ft

B A

MODBUS RTU

EIA-485

Bus

EIA485

A+ B-

A B

AC Unit

B A

AC Indoor Unit

(It is not mandatory to have it in the network)

Internal electronic control board

Remote Controller

Toshiba

B A

MODBUS RTU

EIA-485

Bus

EIA485

A+ B-

A B

AC Unit

AC Indoor Unit

Internal electronic control board

53 mm / 2.1”

90 mm / 3.5”

90 mm / 3.5” 53 mm / 2.1”

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

Figure 2. 1 INMBSTOS001R000 connection diagram

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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 AB bus between the interface and the AC indoor unit following the

instructions of the diagram. Screw each bare cable end in the corresponding AB 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 Intesis interface and make sure it matches the

current installation’s parameters (see section 4.4).

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 Intesis interface requires to be connected to the AC unit (powered) to start communicating.

ON

SW3

SW4

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4. Modbus Interface Specification

4.1 Modbus physical layer

INMBSTOS001R000 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 1

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

2

3

R/W

AC unit Fan Speed 1

▪ 0: Auto ▪ 1: Low ▪ 2: Mid ▪ 3: High

3

4

R/W

AC unit Vane Position 1

▪ 1: POS1 (Horizontal) ▪ 2: POS2 (Horizontal) ▪ 3: POS3 (Medium) ▪ 4: POS4 (Vertical) ▪ 5: POS5 (Vertical) ▪ 6: POS6 ▪ 7: POS7 ▪ 10: Swing

4

5

R/W

AC unit Temperature Setpoint

1,2,3

▪ -32768 (Initialization value) ▪ 16..32ºC (ºC/x10ºC) ▪ 61..90ºF

1

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.

2

Magnitude for this register can be adjusted to Celsius x 1ºC, Celsius x 10ºC (default) or Fahrenheit. See section 4.3.6 for more

information.

3

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

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Register Address

(protocol address)

Register Address

(PLC address)

R/W

Description

5

6

R/W

AC unit Temperature reference

1,2,3

▪ -32768: Initial value. Value invalid, which

comes from the IU’s sensor. If the value that is shown in register 22 (23 PLC) is valid, the address is going to take this value.

▪ Ranges are specific from Manufacturer

(ºC/x10ºC/ºF)

6

7

R/W

Window Contact

▪ 0: Closed (Default) ▪ 1: Open

7

8

R/W

INMBSTOS001R000 Disablement 4

▪ 0: INMBSTOS001R000 enabled (Default) ▪ 1: INMBSTOS001R000 disabled

8

9

R/W

AC Remote Control Disablement 4

▪ 0: Remote Control enabled (Default) ▪ 1: Remote Control disabled

9

10

R/W

AC unit Operation Time 4

▪ 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 5

▪ 0: No Error active ▪ 65535 (-1): Error in the communication of

INMBSTOS001R000 with the AC indoor 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)

1,2,3,6

▪ -32768: Initialization value. No temperature

is being provided from an input sensor. There’s no input sensor.

▪ Any other: (ºC/x10ºC/ºF)

23

24

R

AC Real temperature setpoint

1,2,3,6

▪ There’s no Virtual Temperature. The value

equals to the value of register 5 (6 PLC). The value which is introduced by the user is the one that the machine uses (the external sensor is able to write directly over the machine to do this operation).

▪ Ranges are specific from Manufacturer

(ºC/x10ºC/ºF)

97

98

R/W

Block Periodic Sendings

4,7,8

▪ 0: Non-blocked (Default value) ▪ 1: Blocked

4

This value is stored in non-volatile memory

5

See section 7 for possible error codes and their explanation

6

See section 4.3.6 for more information

7

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.

8

This register applies to firmware version 2.3 onwards

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