Danfoss Modbus Protocol Programming guide

Technical Paper

Danfoss Modbus Protocol

01/05 / Function Code 01/05 : Write/Read

NO			Modbus Address
	Name	Data Type		Description
				D00	0 1
				D01 0 D00 D01 1
				D00
				D01 0
				1
			1(0)	D02D07
1		Int
			01/05
	Relay Output Status
				D00 Relay Output Status 0 Closed 1 Open (When D01 is
				0, D00 is not be written; When D01 is 1, D00 can be written)
				D01: Relay output priority enable 0 Automatic, 1 Manual
				enable
				D02-D07: Retain

02 Function Code 02 : Read Only

NO			Modbus Address
	Name	Data Type		Description
				D00	0	1
				D01	0	1
				D02 EE	0	1
				D03 0	0	1
				D04 50	0	1
				D05D07
			1(0)
1		Int
			02	D00 Internal sensor failure	0	Normal 1 Fail
	Device Failure
				D01 External sensor failure	0	Normal 1 Fail
				D02 EE Failure	0	Normal 1 Fail
				D03 Temp. below 0 alarm	0	Normal 1 Fail
				D04 Temp. high 50 alarm	0	Normal 1 Fail
				D05D07 Retain

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© Danfoss | FHH | 2016.05 | 1

Technical Paper Danfoss Modbus Protocol

03/06 / Function Code 03/06: Read/Write

	NO				Modbus
		Name	Precision	Data Type	Address	Description
	1		1	Int	1(0)	00 , 01 , 02
		Thermostat status			03/06	00: Off, 01:On , 02: Frost protection(Read only)
						5 30
						01 02
					2(1)
	2	Desired room	1	Int
					03/06	Temperature range 5 30
		temperature
						(Active in Temperature Control Mode 01 and 02, data
						can be read and written)
						20 45
	3		1	Int	3(2)	( 03 )
		Desired floor			03/06	Temperature range 20 45
		temperature				(Active in Temperature Control Mode 03)
	4		1	Int	4(3)	00 01
		Child Lock ON/OFF			03/06	00: Off, 01: On
	5		1	Int	5(4)	5 30
		Desired room temp.			03/06	Temperature range 5 30
		for Away Mode
	6		1	Int	6(5)	00 01
		Away Mode Enable			03/06	00: Disable, 01: Enable
						01 02 03
					7(6)
	7	Temperature Control	1	Int		01 Room temperature. control 02 Both room and
					03/06
		Mode				floor temperature control 03 Floor temperature
						control
						5 35
					8(7)	01 02
	8	Maximum Room	1	Int
					03/06
		Temp. Limitation				Temperature range (5-35 ) Active in Temperature
						Control Mode 01 and 02, data can be read and written
						5 35
					9(8)	01 02
	9	Minimum Room	1	Int
					03/06
		Temp. Limitation				Temperature range (5-35 ) Active in Temperature
						Control Mode 01 and 02, data can be read and written
						01 02
					10(9)	02
	10	Floor Temp.	1	Int		01 Maximum Temperature Limitation 02 Mini-
					03/06
		Limitation Mode				mum Temperature Limitation Active in Temperature
						Control Mode 02, data can be read and written
						20 45
					11(10)	02
	11	Floor Temp.	1	Int
					03/06	Temperature range (20-45 ) Active in Temperature
		Limitation Setpoint
						Control Mode 02, data can be read and written
						20 45
					12(11)	03
	12	Maximum Floor	1	Int
					03/06	Temperature range (20-45 ) Active in Temperature
		Temp. Limitation
						Control Mode 03, data can be read and written
						20 45
					13(12)	03
	13	Minimum Floor Temp.	1	Int
					03/06	Temperature range (20-45 ) Active in Temperature
		Limitation
						Control Mode 03, data can be read and written
					14(13)	01 02
	14	Frost Protection	1	Int
					03/06	01: Enable, 02: Disable
		Enable

2 | © Danfoss | FHH | 2016.05

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