Do I need an external Modbus gateway between the M-TEC unit and the ModbusCloud gateway?

No. M-TEC heat pumps with the ZP022 operating system have a built-in Modbus TCP server. You can connect the ModbusCloud gateway directly over Ethernet on the same LAN.

Some temperature readings appear incorrect or extremely high. What could be wrong?

Registers at addresses 1502 and 1503 use signed 16-bit integers (int16), while most other registers use unsigned 16-bit (uint16). Check that your register configuration matches the correct data type. The total electrical energy register at address 702 is int32 and must be read as two consecutive registers.

How do I activate the Modbus interface on the M-TEC heat pump?

Modbus TCP activation is not available through the standard end-user menu. Contact your M-TEC distribution partner or installer support to enable the interface and configure network parameters.

Can I use this template together with the M-TEC Energy Butler template?

Yes. Import both templates as separate devices in ModbusCloud. Make sure each device has a unique IP address or Modbus unit ID so the gateway can address them independently.

Free Modbus template: M-TEC Heating & Cooling

Name: M-TEC Heating & Cooling
Brand: M-TEC
SKU: f35c1473-c497-43a9-84da-34513acd86c4

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Free Modbus template: M-TEC Heating & Cooling | ModbusCloud

Registers (63)

45 read / 26 write

Name	Address	Function	Type	Unit	Access
State Heatpump Operating Hours	700	FC03	uint16	h	R
Actual Outsidetemperature	1502	FC03	int16	°C	R
State Hot Water Operatingmode	403	FC03	uint16		R/W
Actual Hot Water temperature	401	FC03	uint16	°C	R
State Target Roomtemperature HC1	2	FC03	uint16	°C	R
Actual Operating mode HC1	7	FC03	uint16		R/W
Actual Room Humidity HC1	10	FC03	uint16	%	R
Actual Roomtemperature HC1	1	FC03	int16	°C	R
Actual Electrical Heatpump Power	707	FC03	uint16	W	R
Actual Heatpump Thermal Power	706	FC03	uint16	kW	R
State Heatpump Operationmode	713	FC03	uint16		R
State Heatpump Total Electrical Energy	702	FC03	int32	kWh	R
Actual Operating mode HC2	57	FC03	uint16		R/W
Actual Operating mode HC3	107	FC03	uint16		R/W
Actual Room Humidity HC2	60	FC03	uint16	%	R
Actual Room Humidity HC3	110	FC03	uint16	%	R
Actual Roomtemperature HC2	51	FC03	int16	°C	R
Actual Roomtemperature HC3	101	FC03	int16	°C	R
State Target Roomtemperature HC2	52	FC03	uint16	°C	R
State Target Roomtemperature HC3	102	FC03	uint16	°C	R
State Heatpump Error	1450	FC03	uint16		R
State Target Supplyflowtemperature HC1	13	FC03	uint16	°C	R/W
Actual Supplyflowtemperature HC1	15	FC03	uint16	°C	R
Actual Supplyflowtemperature HC2	65	FC03	uint16	°C	R
Actual Supplyflowtemperature HC3	115	FC03	uint16	°C	R
State Target Supplyflowtemperature HC2	63	FC03	uint16	°C	R/W
State Target Supplyflowtemperature HC3	113	FC03	uint16	°C	R/W
Actual Hot Water Targettemperature	402	FC03	uint16	°C	R/W
Actual Buffertemperature Top	601	FC03	uint16	°C	R
State Heatpump operation state	703	FC03	uint16		R
Actual Heatpump Supplyflowtemperature	705	FC03	uint16	°C	R
Actual Heatpump Backflowtemperature	710	FC03	uint16	°C	R
Actual Heatpump Brine IN Temperature	708	FC03	uint16	°C	R
Actual Heatpump BrineOUT Temperature	709	FC03	uint16	°C	R
State Heatpump Targetttemperature	719	FC03	uint16	°C	R
State Compressorspeed	718	FC03	uint16	%	R
State Coolrequest Buffer	608	FC03	uint16		R
State Coolrequest HC1	20	FC03	uint16		R
State Coolrequest HC2	70	FC03	uint16		R
State Coolrequest HC3	120	FC03	uint16		R
State Heatrequest Buffer	607	FC03	uint16		R
State Heatrequest HC1	19	FC03	uint16		R
State Heatrequest HC2	69	FC03	uint16		R
State Heatrequest HC3	119	FC03	uint16		R
Actual Buffertemperature Bottom	603	FC03	uint16	°C	R
HC. 1 normal room temperature	4	FC16	uint16	°C	W
Set System Operation mode	1500	FC16	uint16		W
HC. 1 offset room temperature	6	FC16	int16	K	W
Set cooling requirement HC1	11	FC16	uint16		W
Set heating requirement HC1	12	FC16	uint16		W
HC. 1 lower room temperature	5	FC16	uint16	°C	W
Set Outside temperature	1503	FC16	int16	°C	W
PV. current surplus power	1000	FC16	int16	kW	W
HC. 2 lower room temperature	55	FC16	uint16	°C	W
HC. 3 lower room temperature	105	FC16	uint16	°C	W
Set heating requirement HC2	62	FC16	uint16		W
Set heating requirement HC3	112	FC16	uint16		W
Set cooling requirement HC2	61	FC16	uint16		W
Set cooling requirement HC3	111	FC16	uint16		W
HC. 2 normal room temperature	54	FC16	uint16	°C	W
HC. 3 normal room temperature	104	FC16	uint16	°C	W
HC. 2 offset room temperature	56	FC16	int16	K	W
HC. 3 offset room temperature	106	FC16	int16	K	W

M-TEC Heating & Cooling

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (63)

Working with Modbus in your projects?

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