ABB AquaMaster 3 flowmeter

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
flow_rate	5016	F32BE	1	User flow units
flow_percent	5018	F32BE	1	%
pressure	5024	F32BE	1	User units
pressure_percent	5026	F32BE	1	%
left_electrode_impedance	5028	F32BE	1	kOhm
right_electrode_impedance	5030	F32BE	1	kOhm
coil_current	5038	F32BE	1	A
pulse_output_frequency	5040	F32BE	1	Hz
calibrated_velocity	5050	F32BE	1	m/s
voltage_reference	5056	F32BE	1	V
sig_a_volts	5062	F32BE	1	V
sig_b_volts	5064	F32BE	1	V
external_power_voltage	5068	F32BE	1	V
internal_3v8_voltage	5070	F32BE	1	V
internal_3v2_voltage	5072	F32BE	1	V
totaliser_forward	12002	U32BE	1
totaliser_reverse	12004	U32BE	1
totaliser_net	12006	U32BE	1
totaliser_tariff_a	12008	U32BE	1
totaliser_tariff_b	12010	U32BE	1
external_power_status	1020	U16	1
internal_power_status	1022	U16	1

link settings as documented (unverified): RTU; FC 01,02,03,04,05,06,15,16; AquaMaster 3 RS485 MODBUS option implements the MODBUS over Serial Line protocol. Low power mode after 10s inactivity requires 1 retry to wake up within 1s.

bench facts as documented (unverified)

connector	RS485
wiring notes	RS485 MODBUS option
response timeout	1000 ms
protocol notes	Turnaround delay: 800ms. Low power state after 10s inactivity requires 1 retry to wake up.
identification notes	TransmitterUniqueID at RO 32-Bit register 4013
power	Designed for low power consumption so that it can be used with battery or renewable energy supplies (as well as with mains power).
certifications	UKAS Calibration Laboratory No. 0255
doc revision	COI/FET2XX/MOD/TBL–EN
firmware applicability	WAJC2103 v01.00.00 or above

field reports — community-sourced, unverified (checked 2026-06-11)

confirmed: framing: RTU — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN) stating it follows Modbus Over Serial Line V1.02 using 2-wire RS485
confirmed: function_codes: [1, 2, 3, 4, 5, 6, 15, 16] — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN) register mapping table
confirmed: low power mode after 10s inactivity requires 1 retry to wake up within 1s — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN) section 1.1
confirmed: certifications: UKAS Calibration Laboratory No. 0255 — confirmed by ABB AquaMaster 3 User Guide (OI/FET2XX-EN)
confirmed: doc_revision: COI/FET2XX/MOD/TBL–EN — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN)
confirmed: firmware_applicability: WAJC2103 v01.00.00 or above — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN)
confirmed: TransmitterUniqueID at RO 32-Bit register 4013 — confirmed by ABB AquaMaster 3 MODBUS Tables Supplement (COI/FET2XX/MOD/TBL-EN) which lists TransmitterUniqueID at 1-based address 4013 (0-based 4012)
confirmed: physical: RS485 — confirmed by ABB AquaMaster 3 User Guide (OI/FET2XX-EN)

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.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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