Modbus protocol central air conditioning gateway, suitable for Daikin, Toshiba, Hitachi, Mitsubishi, Midea, Gree, Haier

The central air conditioning gateway can be applied to multiple places: smart homes, smart office buildings, large shopping malls, hotels, hospitals, schools, etc. Provide protocols and multiple port interfaces.

1. Gateway brand:

2. Applicable central air conditioning brands: Daikin, Toshiba, Hitachi, Mitsubishi Heavy Industries, Mitsubishi Electric, Midea, Gree, Mitsubishi Heavy Industries Haier, Hisense, Bosch, Haier, York. Other brands are currently under development. For details, please consult the relevant personnel of the manufacturer.

3. Gateway size: (unit: mm) length * width * height 105 * 92 * 55

4. External interfaces: RS485, RS232, gateway, WIFI, KNX bus (special requirements should be contacted with the manufacturer).

5. Can be connected to central air conditioning indoor and outdoor units:

For other brand signal line code diagrams, please consult us or the corresponding air conditioning manufacturer.

Function:

◆ Communication protocol conversion

◆ There are also devices that can realize remote control and billing system for Daikin air conditioning (please consult the manufacturer for device details)

◆ Each gateway can control up to 64 internal units and multiple external units

◆ The gateway and air conditioning interface signal lines use 2-core shielded signal lines 2 * 1.0 or 2 * 1.5

◆ The gateway achieves upper layer data transmission through RS485 or RS232, etc; It can achieve remote control through mobile or tablet apps.

Rated voltage and frequency

◆ Input: DC12-30V 1A

◆ Power consumption: 40mV-300mV, 2/3W

◆ Power supply: DC 12V/24V power supply

Communication:

◆ Default values: 9600, 8, N, 1

◆ Baud rate: 9600bps

Product functions:

1. Monitoring

Operation/stop status of indoor unit

Operation modes Cooling, heating, air supply, dehumidification (depending on the performance of indoor unit) Set temperature

Set temperature of indoor unit

Indoor temperature, suction temperature of indoor unit

Airflow LL, · L, · M, · H, · HH · (depending on the performance of the indoor unit)

Forced stop status: Abnormal fault and warning codes for the forced stop of indoor units

2. Control

Operation/Stop Control Indoor Unit Operation/Stop

Operating modes: cooling, heating, air supply, dehumidification (depending on the performance of the indoor unit), set temperature for cooling/heating

set temperature

Airflow LL, · L, · M, · H, · HH · (depending on the performance of the indoor unit)

3. Retrieve

System Information Communication Status

How many indoor units are connected, and the network address of each indoor unit

Modbus communication parameters of gateway:

2.1 485 Communication Parameters

Baud rate 9600bps Data bits 8 Stop bits 1 Parity check bits NONE

2.2 Function code:

This gateway supports the following functional codes. If this gateway receives a function code outside of this table, then this function code

It will be considered as illegal functional code, and this gateway will provide abnormal responses. Function code information broadcast

0x04 (04) Read Input Register

0x06 (06) Preset Single Register

(Preset·Single·Register)

0x10 (16) Preset Multiple Register

2.2.1 Function Format:

Read Input Register (0x04)

◆ [Function]

Read the value from the input register.

Please refer to "3. Modbus Register" for its address and input register contents.

◆ [Search]

The query information lists the starting address of the register and the number of registers. The starting address of register addressing is 0: the address of register 30001 is 0x0000. This function can read up to 4 VRV indoor unit information in one query.

The starting address of register addressing is 0: the address of register 30001 is 0x0000.

This function can read up to 4 VRV indoor unit information in one query.

Preset single register (0x06)

◆ [Function]

Write a value to the hold register. In the case of broadcasting, this value is written into the hold register. Please refer to "3. Modbus Register" for its address

and the contents of the hold register.

◆ [Search]

The query information lists the starting address and a value of the register. The address of the starting address 40001 for register addressing is 0x0000.

The address starting from 40001 in register addressing is 0x0000.

Preset multiple registers (0x10)

◆ [Function]

Write multiple values to the hold registers. In the case of broadcasting, this value is written to the same

type hold register of all slaves. Please refer to "3. Modbus Register" for its address and the contents of the hold register.

◆ [Search]

The query information lists the starting address, data size, and multiple values of the register. The starting address of register addressing is 0:

, and the address of register 40001 is 0x0000. This function can write up to one VRV indoor

machine information in one query.

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