Modbus for residential D24810 User manual(A007)
Table Of Contents
- 1 Introduction
- 2 Transmission modes
- 3 Physical layer
- 4 Address
- 5 Notes
- 6 Wiring
- 7 Modbus variable list
- 7.1 Registers for fan control
- 7.2 Registers for heater control
- 7.3 Registers for the damper
- 7.4 Registers for the rotor
- 7.5 Registers for RH sensor
- 7.6 Registers for the week program
- 7.7 Registers for system parameters
- 7.8 Registers for clock
- 7.9 Registers for the filter
- 7.10 Registers for VTC defrosting
- 7.11 Register for VR/VTR defrosting
- 7.12 Registers for the digital inputs
- 7.13 Registers for PCU-PB
- 7.14 Registers for alarms
- 7.15 Register for demand control
- 7.16 Register for wireless network
- 7.17 Registers for RH transfer control
1Introduction
TheunitworksasaModbusslaveandcompliedwithMODBUSoverseriallinespecicationand
implementationguideV1.0ifnothingelseismentioninthismanual.
2Transmissionmodes
ModbusRTU.
Supportedfunctioncodes:
1:ReadCoils
2:ReadDiscreteInput
3:ReadHoldingRegister
4:ReadInputRegister
5:WriteSingleCoil
6:WriteSingleRegister
15:WriteMultipleCoils
16:WriteMultipleRegisters
3Physicallayer
TwowireRS-485.
Thesupportedcommunicationparametersare:
9600Bdor19200Bd.
Noparity,evenparityoroddparity.
4Address
Slaveaddress1to247.
Thefollowingexceptioncodesaregeneratedbytheslave:
1.ILLEGALFUNCTION:whenusinganyofthefunctionscodenotlistedabove.
2.ILLEGALDATAADDRESS:whenaddressinganyregister,coilordigitalinputhigherthanthehighest
addressorlowerthanthelowestaddress.
3.ILLEGALDATAVALUE:whentheformatoftheModbusmessageisfaulty(e.g.wrongmessagelength).
5Notes
Coilsanddigitalinputsarealwaysavailableasregisteraswell.Theaddressofthecoilordigitalinput
canbecalculatedasfollows:
Address–(RegisterAddress*16)–15
Readinganyregisters,inputsorcoilsthatarenotmentionedinthetablesbelowwillresultinreading0.
Writingtoanyaddressthatisnotlistedaswriteableinthetablesbelow,orisnotlistedatall,willhaveno
effect.
Addressinganyregister,coilordigitalinputhigherthanthehighestaddresswillresultinerror02,“Illegal
DataAddress”intheModbusresponse.
ModbusforResidentialunitsUserManual
D24810
1
SystemairSverigeAB