Hexa CONTROL RT226-MB24-S Modbus Fan Coil Thermostat Product Data Sheet

Hexa CONTROL RT226-MB24-S Modbus Fan Coil Thermostat

Specification

• Specification:2 and 4 pipe FCU systems
  • Heat / Cool mode
  • 3 speed thermostatic fan control
  • Motorized valve Modulating control
  • Key card function
  • RS482 Modbus communication
• Power Source:AC220V±10%, 50/60 Hz
• Temperature Operation:5-35 °C
• Accuracy:±0.5 °C
• Load Current:5A
• Installation: Flush mounting
• Dimensions:86X86X13 mm
• Warranty:2 years
• Brand: Hexa Controls
• Origin:People Republic of China (PRC)

Wiring

When the thermostat is off, press the fan speed button ( ) and M button at the same time for 5secs to enter the parameter setup menu. You can shortly press the M button each time to see the menu list.
1	Sensor Calibration	You can calibrate the room temperature by pressing up and down buttons.
2	Thermostatic Control	With this function, you may choose to off fan with valves when the thermostat reaches the setup temperature or to keep the working fan when valves are off. Valves and fan stop at the same time (default mode) The valves stop but fan keeps running
3	Key Lock	To lock the thermostat for user intervention, you can activate the key lock by pressing and holding the Up and Down buttons at the same time for 3 seconds. A key icon appears on the screen. All the buttons are locked except the Power All the buttons are locked including the Power
4	Mode Selection	You can sellect the mode function in this parameter. Cool-only Heat and Cool                                                Heat only
5	Min. Set Temperature	You can select the minimum set temperature between 5-15°C
6	Max. Set Temperature	You can sellect the maximum set temperature between 15-35°C
7	Time Display Setting	You can sellect the time display. 12 hours                                                            24 hours
8	Display Settings	You can sellect the temperature display. Both set and room temperature                        Set temperature only
9	Deadzone Temperature	If the room temperature falls below the selected temperature between 1-5°C, heating will be on.
A	Modbus IP Address	You can select IP address 0X00-0XFF
B	Baudrate	1: 9600	–	2: 19200	–	3: 38400	–	4: 56000	–	5: 115200
Setting the clock
Press and hold M to set the Clock; Press M to set the minutes of the time, and press to adjust the relative values.Same setting for an hour and a week of the time. After that, all will be confirmed automatically.
Setting the modes
Press M to change the system mode to HEATING, COOLING, and VENTILATION. In the mode of VENTILATION, the valve is off but the fan runs.
Setting the fan speed
Press to select the fan speed AUTO, HIGH, MED, LOW

Thermostat Interface Protocol V1.0

This protocol takes standard Modbus as a reference, mainly for use for communication between thermostat and computer (PC). This protocol doesn’t describe Modbus. For information about Modbus, please refer to the relevant standard documents.

Settings

Basic description

No	Parameter	Protocol provision
1	Operating mode	RS-485,master-slave； the thermostat is the slave machine
2	Physical interface	A(+),B(-) two-wire system
3	Baud rate	9600 bps
4	Byte format	9 format (8 data bits +1 stop bit)
5	Modbus	RTU
6	Transmission mode	RTU format (Please refer to standard Modbus)
7	Thermostat address	1－255；(0 is broadcast address)
8	Command code	03，06 (03—read thermostat, 06—set thermostat)
9	CRC check code	CRC－16 (Please refer to standard Modbus)
10	CRC verification mode	CRC－16 (Please refer to standard Modbus)

Read the thermostat frame format

Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03	Set register start	Set register	Set register	Set register	CRC high	CRC low
(default		address	start	Value	Value
is 0X01)		high	address	high	low
		byte	low byte	address	address

Command	Byte	Description	Register address
03	High Byte	00	40001
	Low Byte	Setting Power On/off: 0–means closed, 1–means open
	High Byte	00	40002
	Low Byte	Setting Fan Speed: 0 – Auto speed; 0-Auto speed ;1 – High speed; 2- Mid speed; 3-Low speed
	High Byte	00	40003
	Low Byte	Setting Mode: 0 – Cooling; 1 – Heating; 2 – Ventilation
	High Byte	00	40004
	Low Byte	Setting Temperature: Data is Temperature*10
	High Byte	00	40005
	Low Byte	Setting Lock: 0 – Unlock; 1 – Lock
	High Byte	00	40006
	Low Byte	Minute (value 0-59)
	High Byte	00	40007
	Low Byte	Hour (value 0-23)
	High Byte	00	40008
	Low Byte	Week (value 1-7), 1-Monday, 2-Tuesday, 3-Wednesday, 4- Thursday, 5- Friday, 6- Saturday, 7- Sunday
	High Byte	00	40009
	Low Byte	Reading Room Temperature: Data is Temperature*10
	High Byte	00	40010
	Low Byte	Valve 0n =1 Valve off =0
	High Byte	00	40011
	Low Byte	1 – High speed; 2- Mid speed; 3- Low-speed 4-OFF

Set the thermostat frame format

Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	06	Set register start	Set register	Set register	Set register value	CRC high	CRC low
(default		address	start	Value	low
is 0X01)		high	address	high	address
		byte	low byte	address

Command	Byte	Description	Register address
06	High Byte	00	40001
	Low Byte	Setting Power On/off: 0–means closed, 1–means open
	High Byte	00	40002
	Low Byte	Setting Fan Speed: 0-Auto speed ;1 – High speed; 2- Mid speed; 3-Low speed
	High Byte	00	40003
	Low Byte	Setting Mode: 0 – Cooling; 1 – Heating; 2 – Ventilation
	High Byte	00	40004
	Low Byte	Setting Temperature: Data is Temperature*10
	High Byte	00	40005
	Low Byte	Setting Lock: 0 – Unlock; 1 – Lock
	High Byte	00	40006
	Low Byte	Minute (value 0-59)
	High Byte	00	40007
	Low Byte	Hour (value 0-23)
	High Byte	00	40008
	Low Byte	Week (value 1-7), 1-Monday, 2-Tuesday, 3-Wednesday, 4- Thursday, 5- Friday, 6- Saturday, 7- Sunday

Remark

1. Format
   When the thermostat sends collected temperature data to the PC computer, the value of collected temperature should be multiplied by 2 and sent completely in HEX format because the accuracy is 0.5°C.
   For example: When the collected temperature is 25.5°C, the value sent from the thermostat to the PC computer will be 255
   Similarly, when the PC computer sends set temperature data to the thermostat, the value of the set temperature should be multiplied by 2 and sent completely in HEX format because the accuracy is 0.5°C.
   For example: When the set temperature is 25.5°C, the value sent from the PC computer to the thermostat should be 255
   Example: Read Temperature = 25.5°C
   The send (or receive) value is 25.5*10=255
2. How to change the thermostat’s IP address?
   During power off, press M and at the same time for 5 seconds to access system functions.
   Press M till you reach item A.
   Then press and to change the relative value. The default is 0x01.
   Turn on your thermostat to save the IP setting.
3. Any data in the address from 40001 to 40005 could be read and written at one time. After 40006, it could be just read or written one by one.

REFERENCE:

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Hexa CONTROL RT226-MB24-S Modbus Fan Coil Thermostat Product Data Sheet

Hexa CONTROL RT226-MB24-S Modbus Fan Coil Thermostat Product Data Sheet