Grundfos CUE drive

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

point	address (0-based)	type	scale	unit
parameter_index	8	U16	1
configuration_mode_1_00	999	U16	1
motor_current_1_24	1239	U32BE	0.01	A
control_word_2810	2809	U16	1
bus_reference_2811	2810	I16	1	%
status_word_2910	2909	U16	1
main_actual_value_2911	2910	I16	1	%
maximum_reference_3_03	3029	U32BE	0.001	RPM
status_word_16_03	16029	U16	1
main_actual_value_16_05	16049	I16	1	%
motor_current_16_14	16139	U32BE	0.01	A
digital_inputs_16_60	16599	U16	1
control_word_50000	49999	U16	1
bus_reference_50010	50009	I16	1	%
status_word_50200	50199	U16	1
main_actual_value_50210	50209	I16	1	%

link settings as documented (unverified): RTU; baud 2400/4800/9600/19200; FC 01,03,05,06,08,11,15,16,17; If the baud rate is greater than 19200, then the 3.5 character time is replaced by a timeout time of 1.75 ms.

⚠ Grundfos recommends only using one of the three mentioned ways to control the frequency converter! Grundfos recommends register 2810-2873 and 2910-2973 to control the frequency converter ensuring compatibility with all controllers. Par. 200-52 Control Source Request is to be set to 1 Remote to control the CUE via Modbus. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

broadcast	supported
protocol notes	Modbus RTU messages addressed to zero are broadcast messages. No response is permitted for broadcast messages.
doc revision	93525145 11.2025

generated by gemini:gemini-3.5-flash · harvested from https://www.grundfos-eica.com/fileadmin/public/Redaktion/Dokumente/PDF/Functional_profiles/93525145_11_2025_Native_Modbus_RTU_for_CUE_FP_GB_online.pdf (Grundfos); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.