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VRF / split AC gateway · Modbus register map
Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway Modbus register map
Updated 16 October 2026
Modbus RTU server that connects to the CN105 port of a single Mitsubishi Electric indoor unit. Points are 16-bit holding registers for on/off, mode, fan, vane, setpoint, room temperature, alarm and error code, with window-contact and external-temperature (virtual temperature) features.
This page lists 21 Modbus registers for the Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway — 12 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
- INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway
- Equipment type
- VRF / split AC gateway
- Registers
- 21 (12 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
- INMBSMIT001I000, Intesis Mitsubishi Electric Modbus
Integration notes: Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway
Set the address on SW3 and the baud on SW3/SW4, set SW1 to match the unit's fan speeds, power-cycle, then read holding registers 0-11 with function 03 and write with 06. Confirm the temperature scale on SW4 first.
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; register 7 (gateway disablement) must be 0 for commands to reach the unit.
Byte order & addressing
- Temperature scale depends on DIP SW4 and the manual is inconsistent about the factory default (x1 vs x10).
- 8-N-2 by default; 8-N-1 is auto-detected.
- Function 16 is accepted only with a quantity of one register.
Network setup
- SW3 positions 1-6: slave address. SW3 positions 7-8 with SW4 position 3: baud (9600 default).
- SW1: number of fan speeds / vane features of the indoor unit.
- SW4: x1/x10, °C/°F and 120 Ω termination.
- DIP changes need a power cycle; the gateway only talks once the AC unit is powered.
Watch out for
- Writing register 22 enables virtual temperature: the Mitsubishi remote can no longer change the setpoint.
- Error code 65535 means the gateway lost the indoor unit.
Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC 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 unit and SW1 setting. | UINT16 | Read/write | 0 = Auto; 1 = Low; 2 = Mid-1; 3 = Mid-2; 4 = High | |||
| HR | 3 | AC unit vane position | Available positions depend on the indoor unit. | UINT16 | Read/write | 0 = Auto; 1 = Horizontal; 2 = Position-2; 3 = Position-3; 4 = Position-4; 5 = Vertical; 10 = Swing | |||
| HR | 4 | AC unit temperature setpoint | Setpoint 16..32 °C (61..90 °F). SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read/write | |||
| 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 = INMBSMIT001I000 enabled; 1 = INMBSMIT001I000 disabled | |||
| HR | 8 | AC remote control disablement | Blocks the unit's remote control; 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 | Mitsubishi error number (manual section 7); 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 switch-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 slave address | Range 1..63. | UINT16 | Read | ||||
| HR | 21 | Max number of fan speeds | Follows DIP SW1 position 4. | 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 setpoint temperature | Setpoint actually applied in the indoor unit. SW4 x1 °C assumed (x10: 0.1, or °F). | UINT16 | °C | Read | |||
| HR | 49 | Device ID | Reads 0x0500. | UINT16 | Read | ||||
| HR | 50 | Software version | UINT16 | Read | |||||
| HR | 97 | Block periodic sendings | 1 = only forward Modbus writes that change the value (FW 2.1+). | 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. Registers 4 and 5 print the marker as -32678, an apparent typo, so no enum is given there.
- Temperature registers depend on DIP SW4: x1 °C, x10 °C (decidegrees) or °F (no °F x10). The register-table footnote calls x10 the default, but the SW4 table and the quick-start page (all other switches off) give x1 °C as the factory setting, so scale 1 / °C is used. Read SW4 position 1-2 on site: if x10 is set use scale 0.1; if °F is set the values are whole °F.
- Error code enum (Mitsubishi codes) not reproduced; see manual section 7.
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) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway
What Modbus registers does the Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway have?
This map lists 21 registers: 21 holding registers. 12 of them can be written. Registers vary with firmware, options and configuration, so confirm against the device.
Are the Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC 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. Each table gives a 'protocol address' (base 0) and a 'PLC address' (base 1). The protocol address is the wire address and is used for 'documented'.
What are the minimum Modbus registers to integrate the Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC 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) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway?
No enable step; register 7 (gateway disablement) must be 0 for commands to reach the unit.
Where is the official Intesis (HMS Networks) INMBSMIT001I000 Mitsubishi Electric AC to Modbus RTU gateway Modbus documentation?
The source is Intesis INMBSMIT001I000 Modbus RTU (EIA-485) Interface for Mitsubishi Electric air conditioners - User's Manual (User's Manual r2.8 EN), revision 2024-11, published free by Intesis (HMS Networks) at https://www.hms-networks.com/docs/default-source/products/intesis/manuals-and-guides---manuals/user-manual-inmbsmit001i000.pdf.
More Intesis (HMS Networks) Modbus register maps
- Heat pump gateway (VRF / split AC gateway)
Intesis (HMS Networks) IN485MIT001A000 Mitsubishi Electric Ecodan air-to-water to Modbus RTU / BACnet MS/TP gateway
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) INMBSDAI001R000 Daikin VRV / Sky Air to Modbus RTU gateway
One Daikin VRV or Sky Air indoor unit (or group) on the P1P2 bus via INMBSDAI001R000, user manual v1.0.1.
Also known as: INMBSDAI001R000, Intesis Daikin VRV 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 - 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
Intesis (HMS Networks) INMBSPAN001R000 Panasonic AC to Modbus RTU gateway
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
Intesis (HMS Networks) INMBSTOS001R000 Toshiba AC to Modbus RTU gateway
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: Intesis INMBSMIT001I000 Modbus RTU (EIA-485) Interface for Mitsubishi Electric air conditioners - User's Manual · User's Manual r2.8 EN · rev. 2024-11. Register numbers, types, scaling and units are reproduced as published; descriptions are our own.