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Grundfos Modbus register maps

Updated 29 October 2026

3 Grundfos models, 287 registers in all, each re-typed from Grundfos’s own free documentation and checked against it.

• 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 (circulator / E-pump / pump drive)

  Grundfos E-pumps (MAGNA3, TPE, CRE, CUE) via CIM 200 / CIM 500

  Grundfos E-pumps (CRE/CRNE/CRIE, MTRE, CHIE, CME, TPE, TPE Series 2000, NBE/NKE), CUE drives and MAGNA3 with a CIM/CIU 200, CIM/CIU 500 or built-in SoftCIM.

  102 registers · 20 writable · RTU/TCP
  Also known as: MAGNA3, TPE, TPE Series 2000, CRE, CRNE, CRIE, MTRE, CHIE, CME, NBE, NKE, CUE, MGE, CIM 200, CIU 200, CIM 500, CIU 500, SoftCIM Modbus RTU
• 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

Grundfos: 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).