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Pumps Modbus register maps

Updated 29 October 2026

5 pumps register maps from 3 manufacturers: Daikin, Grundfos, Wilo.

• Heat pump

  Daikin DCOM-LT/MB Modbus interface for Daikin Altherma LT heat pumps

  Daikin Altherma low-temperature (LT) air-to-water heat pumps fitted with the DCOM-LT/MB (model number 534-001) P1P2-to-Modbus RTU interface, standard operating mode, per reference manual 534-252-A3.

  32 registers · 13 writable · RTU
  Also known as: DCOM-LT-MB, 534-001, Altherma LT Modbus interface
• Pump (booster system / multi-pump controller)

  Grundfos Booster systems (Hydro MPC, Hydro Multi-E, Multi-B) via CIM 200 / CIM 500

  Grundfos booster systems: Hydro MPC / Control MPC (CU 352), GENIECON MPC, Hydro Multi-B (CU 323), DDD (CU 354), Hydro Multi-E, TPED and MAGNA3-D twin pumps, with CIM/CIU 200, CIM/CIU 500 or SoftCIM.

  127 registers · 23 writable · RTU/TCP
  Also known as: Hydro MPC, Control MPC, CU 352, GENIECON MPC, Hydro Multi-E, Hydro Multi-B, CU 323, DDD, CU 354, TPED, MAGNA3-D, CIM 200, CIM 500, SoftCIM Modbus TCP
• Pump (chemical dosing pump)

  Grundfos SMART Digital DDA dosing pump (SoftCIM, CIM 200 / CIM 500)

  Grundfos SMART Digital DDA dosing pumps: DDA model C with built-in SoftCIM Modbus RTU/TCP, and DDA XL (or others) through a CIM 200 Modbus RTU or CIM 500 Modbus TCP module in a CIU 900, per functional profile 98473491 (09.2026).

  58 registers · 19 writable · RTU/TCP
  Also known as: DDA, DDA S, DDA XL, DDA-C, DDA model C, SMART Digital S, SMART Digital XL, CIM 200, CIM 500, 98473491
• Pump (high-efficiency circulator)

  Wilo Para MAXO (built-in Modbus RTU)

  Wilo-Para MAXO OEM circulators with the built-in Modbus RTU interface (module versions 1.00-99.99).

  28 registers · 10 writable · RTU
  Also known as: Para MAXO, Wilo-Para MAXO, Para MAXO Modbus
• Pump (smart circulator)

  Wilo Stratos MAXO with CIF module Modbus RTU

  Wilo-Stratos MAXO single and twin-head circulators fitted with the plug-in CIF module Modbus RTU (article 2190368, UL 2237080), module firmware 1.00-99.99; some registers need a newer module version as noted.

  56 registers · 11 writable · RTU
  Also known as: Wilo-Stratos MAXO, Stratos MAXO-D, Stratos MAXO-Z, CIF-Module Modbus RTU, CIF Modbus RTU 2190368, CIF Modbus RTU UL 2237080

Pumps: 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).