Itron CF ECHO II/CF 51/CF 55 thermal energy meter (needs Modbus card)

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
serial_number	0	F32BE	1
energy_index	2	F32BE	1	kWh
volume	4	F32BE	1	Litre
instantaneous_power	6	F32BE	0.1	1/10e kW
instantaneous_flowrate	8	F32BE	1	Litre/h
outgoing_temperature	10	F32BE	0.1	°C /10
return_temperature	12	F32BE	0.1	°C /10
temperature_difference	14	F32BE	0.01	°K/100
air_conditioning_energy_index	16	F32BE	1	kWh

link settings as documented (unverified): RTU; baud 2400/4800/9600/19200; FC 03,08; The Modbus card address is the value of the Mbus primary address of the meter (1-247).

bench facts as documented (unverified)

terminals	A = D+, B = D-
A/B polarity	protected against polarity reversals
termination	120 Ohm with switch
connector	terminal block
isolation	Double isolation
wiring notes	2 wires, Differential Half-Duplex
max registers/read	22
sentinel values	Alarm data on the meter are returned in format 999999 (decimal). Optional data are returned with a value of 000000 (decimal) when not available. Negative values are transmitted in absolute values.
protocol notes	The Modbus data returned are updated with the meter data every minute. Communication priority is given to the optical connector, in which case Modbus data remain on the latest meter values read prior to optical communication.
serial register	0000
power	3.6 V - 12 V DC, Current < 35 mA (120 mA in Modbus communication)
environment	Storage temperature: -10 °C ... +60 °C, Operating temperature: +5 °C ... +55 °C, Relative humidity: < 95 %
certifications	EN 60950, EN 61000-6.2, EN 61000-6.3
doc revision	HE-0063.0-FR-03.16 A4003834-AA, Valid 2016

generated by gemini:gemini-3.5-flash · harvested from https://www.allmess.de/fileadmin/multimedia/alle_Dateien/MA/MA_A4003834%20User%20guide%20ModBus.pdf (Itron); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-11 · recorded 2026-06-11

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.