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HVAC equipment Modbus register maps

Updated 24 October 2026

3 hvac equipment register maps from 3 manufacturers: Daikin Applied, Flexit, Regin.

• Rooftop unit

  Daikin Applied Rebel / Rebel Applied rooftop (MicroTech 4 controller)

  Daikin Applied Rebel Applied (DPSA, R-410A/R-32) and Rebel (DPS, R-32) packaged rooftops with MicroTech 4 controller and Modbus RTU module, per ED 19133-2 (Oct 2025).

  112 registers · 35 writable · RTU
  Also known as: DPSA, DPS, Rebel Applied, Rebel, MicroTech 4 rooftop, ED 19133-2
• Air handler

  Flexit Nordic residential air handling unit (Flexit GO, built-in Modbus)

  Flexit NORDIC series residential ventilation units with Flexit GO control and built-in Modbus RTU (cable harness 116405), per the 'Modbus Nordic Basic' register sheet and instruction 117989-01 (2020-01). Not EcoNordic, which has its own register sheet.

  59 registers · 14 writable · RTU
  Also known as: Nordic S2, Nordic S3, Nordic S4, Nordic CL2, Nordic CL3, Nordic CL4, Flexit GO, Modbus Nordic Basic, 117989
• Air handler controller

  Regin Corrigo ventilation controller (ventilation application 3.6)

  Regin Corrigo controllers running the pre-programmed ventilation (air handling unit) application, version 3.6 or later; not the heating or Exigo applications.

  134 registers · 45 writable · RTU
  Also known as: Corrigo E, Corrigo ventilation, Corrigo E ventilation, Corrigo AHU controller

HVAC equipment: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).