Sentera FCTH temp/RH sensor

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
temperature_reading	0	I16	0.1	°C
temperature_output_value	1	U16	0.1	%
temperature_alert_flag	2	U16	1
temperature_range_limit_flag	3	U16	1
temperature_sensor_state	4	U16	1
relative_humidity_level	9	U16	0.1	% rH
relative_humidity_output_value	10	U16	0.1	%
relative_humidity_alert_flag	11	U16	1
relative_humidity_range_limit_flag	12	U16	1
humidity_sensor_state	13	U16	1
dew_point_level	14	I16	0.1	°C
actual_output_value	38	U16	0.1	%
output_control_mode	39	U16	1
ambient_light_intensity	40	U16	1	lux
active_standby	41	U16	1
ambient_light_sensor_state	42	U16	1

link settings as documented (unverified): RTU; default 19200 8E1; unit ID 1; FC 03,04,06,16

bench facts as documented (unverified)

termination	Software-selectable Modbus network resistor termination (NBT)
model register	HR4
firmware register	HR6
doc revision	MBRM-FCTH-EN-000 - 27 / 04 / 2021

generated by gemini:gemini-3.5-flash · harvested from https://www.sentera.eu/en/files/article/document/mbrm/fcthf-modbus-register-map.pdf (Sentera); manual-faithful — the document's claims, panel risk: LOW — panel concurs, no field disagreements; 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.