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Armstrong Fluid Technology Modbus register maps

Updated 16 October 2026

1 Armstrong Fluid Technology model, 28 registers in all, each re-typed from Armstrong Fluid Technology’s own free documentation and checked against it.

• Pump (vertical in-line with integrated VFD)

  Armstrong Fluid Technology Design Envelope 4300 / 4380 with DEPM IVS / DE IVS drive (map v2)

  Armstrong Design Envelope 4300 and 4380 vertical in-line pumps with DEPM IVS or DE IVS drive, controller firmware v1.17 and newer (Modbus register map version 2).

  28 registers · 7 writable · RTU/TCP
  Also known as: Design Envelope 4300, Design Envelope 4380, DEPM IVS, DE IVS, Design Envelope pump controller, DEPC

Armstrong Fluid Technology: 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).