1. Home
2. Modbus register maps
3. Danfoss

Manufacturer

Danfoss Modbus register maps

Updated 24 October 2026

3 Danfoss models, 174 registers in all, each re-typed from Danfoss’s own free documentation and checked against it.

• Variable frequency drive

  Danfoss VLT AQUA Drive FC 202 (Modbus RTU)

  VLT AQUA Drive FC 202 using the built-in RS-485 (FC) port with 8-30 Protocol = Modbus RTU and the FC control profile; parameter data checked against the software 5.4X programming guide.

  61 registers · 22 writable · RTU
  Also known as: VLT AQUA Drive, FC202, FC-202, AQUA Drive FC 202
• Variable frequency drive

  Danfoss VLT AutomationDrive FC 301/302 (Modbus RTU)

  VLT AutomationDrive FC 301 and FC 302 (0.25-75 kW design guide; same scheme across sizes) using the built-in RS-485 (FC) port with 8-30 Protocol = Modbus RTU and the FC control profile; parameter data checked against the software 9.5x / 48.96 programming guide.

  62 registers · 22 writable · RTU
  Also known as: VLT AutomationDrive, FC 301, FC301, FC302, FC-302, FC-301, FC 300
• Variable frequency drive

  Danfoss VLT HVAC Drive FC 102 (Modbus RTU)

  VLT HVAC Drive FC 102 using the built-in RS-485 (FC) port with 8-30 Protocol = Modbus RTU and the FC control profile; parameter scaling checked against the software 7.61 programming guide.

  51 registers · 18 writable · RTU
  Also known as: VLT HVAC Drive, FC102, FC-102

Danfoss: 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).