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VRF / split AC gateway · Modbus register map
Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway Modbus register map
Updated 16 October 2026
Modbus RTU server that connects to the P1P2 remote-controller bus of a Daikin VRV or Sky Air indoor unit. All points are 16-bit holding registers covering on/off, mode, fan, vanes, setpoint, room temperature, alarm and Daikin error code, plus window-contact and virtual-temperature features.
This page lists 25 Modbus registers for the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway — 14 writable — with the table, 0-based wire address, data type, word order, scale, units and access of each, re-typed from Intesis (HMS Networks)’s own free documentation (linked below) and checked against it.
- Manufacturer
- Intesis (HMS Networks)
- Model
- INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway
- Equipment type
- VRF / split AC gateway
- Registers
- 25 (14 writable)
- Transport
- Modbus RTU
- Default unit ID
- 1
- Default serial
- 9600 baud, 8N2
- Documented addressing
- 0-based (the number printed is the address on the wire)
- Also known as
- INMBSDAI001R000, Intesis Daikin VRV Modbus
Integration notes: Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway
Wire RS-485 A/B, set the address on SW3 and the baud on SW3/SW4, reboot, then read holding registers 0-11 with function 03 and write with function 06. Check SW1: without a Daikin wired remote on the P1P2 bus the gateway must be set as header.
Minimum registers to map
Addresses are 0-based wire addresses. Enough to monitor and run the unit; map more as the job needs.
| Register | Name | Type | Why | Access |
|---|---|---|---|---|
| HR 0 | AC unit On/Off | UINT16 | On/off | Read/write |
| HR 1 | AC unit mode | UINT16 | Mode | Read/write |
| HR 2 | AC unit fan speed | UINT16 | Fan speed | Read/write |
| HR 4 | AC unit temperature setpoint | UINT16 | Setpoint | Read/write |
| HR 5 | AC unit temperature reference | UINT16 | Room temperature | Read |
| HR 10 | AC unit alarm status | UINT16 | Alarm flag | Read |
| HR 11 | Error code | UINT16 | Error code | Read |
Enable Modbus control & writes
No enable step. Set a slave address on SW3 and keep register 7 (gateway disablement) at 0 so Modbus commands reach the unit.
Byte order & addressing
- Temperature scale changes with DIP SW4 (x1 °C, x10 °C or °F).
- Function 16 is accepted only with a quantity of one register.
- At most 50 registers per read request.
- 8-N-2 by default; 8-N-1 is auto-detected.
Network setup
- SW1: header/follower role on the P1P2 bus, VRV operation-mode master/slave, and which sensor is the room reference.
- SW3 positions 1-6: slave address (binary). Baud on SW3/SW4 (9600 default).
- SW4: temperature scale and 120 Ω termination.
- DIP changes need a reboot.
Watch out for
- Factory SW1 setting is follower, which needs a Daikin wired remote acting as header on P1P2.
- Writing an external temperature to register 22 turns on virtual temperature: the wired remote can no longer change the setpoint and register 23 may differ from register 4.
- Error code 65535 means the gateway lost the indoor unit.
Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway Modbus registers
Address = 0-based wire address (the documented number is shown under it when it differs) · Order: ABCD = high word first, CDAB = low word first · Scale: engineering value = raw × scale.
| Table | Address | Name | Description | Type | Order | Scale | Units | Access | Values / bits |
|---|---|---|---|---|---|---|---|---|---|
| HR | 0 | AC unit On/Off | UINT16 | Read/write | 0 = Off; 1 = On | ||||
| HR | 1 | AC unit mode | Available modes depend on the indoor unit. | UINT16 | Read/write | 0 = Auto; 1 = Heat; 2 = Dry; 3 = Fan; 4 = Cool | |||
| HR | 2 | AC unit fan speed | Available speeds depend on the indoor unit. | UINT16 | Read/write | 0 = Auto; 1 = Low; 2 = Mid; 3 = High | |||
| HR | 3 | AC unit up/down vane position | Available positions depend on the indoor unit. | UINT16 | Read/write | 1 = Position 1 (Horizontal); 2 = Position 2 (Horizontal); 3 = Position 3 (Medium); 4 = Position 4 (Vertical); 5 = Position 5 (Vertical); 10 = Swing | |||
| HR | 4 | AC unit temperature setpoint | Setpoint 16..31 °C (61..88 °F). SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read/write | 32768 = Not initialised / no value (0x8000; manual writes -32768) | ||
| HR | 5 | AC unit temperature reference | Unit room temperature, 10..38 °C. SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read | |||
| HR | 6 | Window contact | Virtual window contact written from Modbus. | UINT16 | Read/write | 0 = Closed; 1 = Open | |||
| HR | 7 | Gateway disablement | Stops the gateway passing commands; stored in NVM. | UINT16 | Read/write | 0 = Gateway enabled; 1 = Gateway disabled | |||
| HR | 8 | AC remote control disablement | Blocks the wired remote on the bus; stored in NVM. | UINT16 | Read/write | 0 = Remote control enabled; 1 = Remote control disabled | |||
| HR | 9 | AC unit operation time | Hours the unit has been on; stored in NVM. | UINT16 | h | Read/write | |||
| HR | 10 | AC unit alarm status | UINT16 | Read | 0 = No alarm condition; 1 = Alarm condition | ||||
| HR | 11 | Error code | Daikin error number (manual error table); 65535 = no comms with AC unit. | UINT16 | Read | 0 = No error present; 65535 = Communication error with the AC unit | |||
| HR | 13 | Open window switch-off timeout | Countdown after window opens before unit switches off (0..30, default 30). | UINT16 | min | Read/write | |||
| HR | 14 | Modbus RTU baud rate | Baud rate in use (set on DIP switches). | UINT16 | Read | ||||
| HR | 15 | Device Modbus server address | Range 1..63. | UINT16 | Read | ||||
| HR | 21 | Maximum number of fan speeds | UINT16 | Read | |||||
| HR | 22 | External ambient temperature (Modbus) | Room temperature written from Modbus (virtual temperature). SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read/write | 32768 = Not initialised / no value (0x8000; manual writes -32768) | ||
| HR | 23 | AC real temperature setpoint | Setpoint actually applied in the indoor unit. SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read | |||
| HR | 26 | AC unit left/right vane position | UINT16 | Read/write | 0 = Auto; 10 = Swing | ||||
| HR | 48 | Switch value | Current DIP switch settings. | UINT16 | Read | ||||
| HR | 49 | Device ID | Reads 0x0801. | UINT16 | Read | ||||
| HR | 50 | Software version | UINT16 | Read | |||||
| HR | 55 | Under voltage counter | Range 0..300. | UINT16 | Read/write | ||||
| HR | 81 | Error address | Address of the indoor unit reporting the error. | UINT16 | Read | ||||
| HR | 97 | Block periodic sendings | 1 = only forward Modbus writes that change the value (FW 1.5+). | UINT16 | Read/write | 0 = Non-blocked; 1 = Blocked |
Notes on this map
- Every register is documented as a 16-bit unsigned holding register and no temperature range in the manual goes below zero, so temperatures are UINT16. The 'no value' marker the manual writes as -32768 is raw 0x8000 (32768) and is listed as an enum entry. Register 5 prints the marker as -32678, an apparent typo, so no enum is given there.
- Temperature scale follows DIP SW4: x1 °C (factory default, stated consistently in this manual), x10 °C or °F (no °F x10). Scale 1 / °C here matches the default only; use 0.1 if x10 is selected.
- Baud rate register 14 lists the selectable rates but not the numeric code for each, so no enum is given.
- The error-code enum (Daikin remote-controller codes) is not reproduced; see the manual's error code table.
Check it against the live device. A register map tells you what the controller can expose; the unit in front of you may differ by firmware or options. Read a few registers and compare them with the unit’s own display; for a 32-bit value the float and byte-order decoder shows all four word orders at once, so a wrong word order or scale is obvious. New to this? Read what a register map is and why addresses are off by one.
Questions about the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway
What Modbus registers does the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway have?
This map lists 25 registers: 25 holding registers. 14 of them can be written. Registers vary with firmware, options and configuration, so confirm against the device.
Are the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway Modbus addresses 0-based or 1-based?
The manufacturer's document numbers registers 0-based (the number printed is the address on the wire). Every address on this page is the 0-based wire address you put in the request; the documented number is shown under it where it differs. Tables list a 'protocol address' (base 0) and a 'PLC address' (base 1). The protocol address is the wire address and is what 'documented' holds; PLC tools that add 1 should use the PLC column.
What are the minimum Modbus registers to integrate the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway?
Start with HR 0 AC unit On/Off (On/off); HR 1 AC unit mode (Mode); HR 2 AC unit fan speed (Fan speed); HR 4 AC unit temperature setpoint (Setpoint); HR 5 AC unit temperature reference (Room temperature); HR 10 AC unit alarm status (Alarm flag); HR 11 Error code (Error code).
How do I enable Modbus control of the Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway?
No enable step. Set a slave address on SW3 and keep register 7 (gateway disablement) at 0 so Modbus commands reach the unit.
Where is the official Intesis (HMS Networks) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway Modbus documentation?
The source is INMBSDAI001R000 Modbus RTU Gateway - Compatible with VRV and Sky air conditioning systems commercialized by Daikin - User Manual (User Manual Version 1.0.1), revision 2024-03-01, published free by Intesis (HMS Networks) at https://www.hms-networks.com/docs/default-source/products/intesis/manuals-and-guides---manuals/user-manual-inmbsdai001r000.pdf.
More Intesis (HMS Networks) Modbus register maps
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Intesis (HMS Networks) IN485MIT001A000 gateway on the CN105 socket of Mitsubishi Electric Ecodan air-to-water heat pumps, set to Modbus RTU, per user manual version 1.0.3 (2025-12-02).
Also known as: IN485MIT001A000, Ecodan Modbus, Mitsubishi Ecodan Modbus RTU, Intesis Ecodan, HMS Ecodan gateway - VRF / split AC gateway
Intesis (HMS Networks) INMBSDAI001I000 Daikin domestic AC to Modbus RTU gateway
Single Daikin domestic (S21-connector) indoor unit via INMBSDAI001I000, user manual v1.0.2.
Also known as: INMBSDAI001I000, Intesis Daikin domestic Modbus - VRF / split AC gateway
Intesis (HMS Networks) INMBSFGL001I000 Fujitsu domestic AC to Modbus RTU gateway
One Fujitsu domestic (RAC) or compatible VRF indoor unit, connected to the CN65/CN12/CN6 socket on the indoor board via INMBSFGL001I000, user manual v1.5 (01/2024).
Also known as: INMBSFGL001I000, FJ-AC-MBS-1, Intesis Fujitsu domestic Modbus - VRF / split AC gateway
Intesis (HMS Networks) INMBSFGL001R000 Fujitsu AC to Modbus RTU gateway
One Fujitsu indoor unit, or a group of up to 16 controlled together as one, on the 3-wire BWR remote-controller bus via INMBSFGL001R000, user manual v2.4 (02/2025).
Also known as: INMBSFGL001R000, Intesis Fujitsu Modbus - VRF / split AC gateway
Intesis (HMS Networks) INMBSHIT001R000 Hitachi AC to Modbus RTU gateway
Intesis (HMS Networks) INMBSHIT001R000 interface on the AB bus of one Hitachi commercial-line indoor unit (or group), per user manual v1.6 (01/2024).
Also known as: INMBSHIT001R000, Hitachi Modbus gateway, Intesis Hitachi - VRF / split AC gateway
Intesis (HMS Networks) INMBSLGE001R000 LG AC to Modbus RTU gateway
One LG indoor unit on the BYR (wired remote) bus via INMBSLGE001R000 (legacy code LG-RC-MBS-1), user manual v1.9 (01/2024).
Also known as: INMBSLGE001R000, LG-RC-MBS-1, Intesis LG Modbus - VRF / split AC gateway
Intesis (HMS Networks) INMBSMHI001R000 Mitsubishi Heavy Industries AC to Modbus RTU gateway
Mitsubishi Heavy Industries indoor units (one, or up to 16 controlled together as one) on the XY remote-controller bus, user manual r6.4 (01/2024).
Also known as: INMBSMHI001R000, MH-RC-MBS-1, Intesis Mitsubishi Heavy Industries Modbus, Intesis MHI Modbus - VRF / split AC gateway
Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway
One Mitsubishi Electric Domestic, Mr. Slim or City Multi indoor unit via INMBSMIT001I000, user manual r2.8 (11/2024).
Also known as: INMBSMIT001I000, Intesis Mitsubishi Electric Modbus - Heat pump gateway (VRF / split AC gateway)
Intesis (HMS Networks) INMBSPAN001A100 Panasonic Aquarea H/J/K/L/M air-to-water to Modbus RTU gateway
Intesis (HMS Networks) INMBSPAN001A100 gateway connected to Panasonic Aquarea H, J, K, L and M series air-to-water heat pumps, per user manual version 1.0.2 (2026-02-04).
Also known as: INMBSPAN001A100, Aquarea Modbus, Panasonic Aquarea Modbus RTU, Intesis Aquarea, INMBSPAN001A000 (legacy order code) - VRF / split AC gateway
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Panasonic / Sanyo ECOi and PACi indoor units (one, or up to 16 controlled together as one) on the R1R2 remote-controller bus, user manual v2.8 (09/2025).
Also known as: INMBSPAN001R000, PA-RC2-MBS-1, Intesis Panasonic Modbus, Intesis Sanyo Modbus - VRF / split AC gateway
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Toshiba Digital Inverter (RAV) and VRF indoor units on the AB remote bus via INMBSTOS001R0xx, user manual r2.9 (01/2024).
Also known as: INMBSTOS001R000, INMBSTOS001R0xx, Intesis Toshiba Modbus
Source: INMBSDAI001R000 Modbus RTU Gateway - Compatible with VRV and Sky air conditioning systems commercialized by Daikin - User Manual · User Manual Version 1.0.1 · rev. 2024-03-01. Register numbers, types, scaling and units are reproduced as published; descriptions are our own.