Sentera FCTH temp/RH sensor

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
Device slave address	0	U16	1
Temperature reading	0	I16	0.1	°C
Modbus baud rate	1	U16	1
Temperature output value	1	U16	0.1	%
Modbus parity	2	U16	1
Temperature alert flag	2	U16	1
Device type	3	U16	1
Temperature range limit flag	3	U16	1
HW version	4	U16	1
Temperature sensor state	4	U16	1
FW version	5	U16	1
Modbus safety timeout	7	U16	1	minutes
Modbus network resistor termination (NBT)	8	U16	1
Modbus registers reset	9	U16	1
Relative humidity level	9	U16	0.1	% rH
Minimum temperature range	10	U16	0.1	°C
Relative humidity output value	10	U16	0.1	%
Maximum temperature range	11	U16	0.1	°C
Relative humidity alert flag	11	U16	1
Minimum temperature alert	12	U16	0.1	°C
Relative humidity range limit flag	12	U16	1
Maximum temperature alert	13	U16	0.1	°C
Humidity sensor state	13	U16	1
Dew point level	14	I16	0.1	°C
Minimum relative humidity range	18	U16	0.1	% rH
Maximum relative humidity range	19	U16	0.1	% rH
Minimum relative humidity alert	20	U16	0.1	% rH
Maximum relative humidity alert	21	U16	0.1	% rH
Active light level	34	U16	1	lux
Standby light level	35	U16	1	lux
Actual output value	38	U16	0.1	%
Output control mode	39	U16	1
Output 1 mode	40	U16	1
Ambient light intensity	40	U16	1	lux
Output 1 enable / disable	41	U16	1
Active / Standby	41	U16	1
Output 1 overwrite value	42	U16	0.1	%
Ambient light sensor state	42	U16	1
Internal voltage source selection Output 1	43	U16	1
Output 1 min. value	44	U16	0.1	%
Output 1 max. value	45	U16	0.1	%
Temperature sensor selection (ON / OFF)	46	U16	1
Relative humidity sensor selection (ON / OFF)	56	U16	1
LED indication	78	U16	1
LED brightness	79	U16	10	%

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

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

confirmed: comms.baud_rates: [4800, 9600, 19200, 38400, 57600, 115200, 230400] — confirmed by MBRM-FCTH-EN-000 Holding Register 2 options [2.3]
confirmed: comms.default_baud: 19200 — confirmed by MBRM-FCTH-EN-000 Holding Register 2 default value of 2 (19,200 bps) [5.3]
confirmed: comms.default_unit_id: 1 — confirmed by MBRM-FCTH-EN-000 Holding Register 1 default value of 1 [5.3]
confirmed: comms.parity: E and stop_bits: 1 — confirmed by MBRM-FCTH-EN-000 Holding Register 3 default value of 1 (8E1) [2.3]
confirmed: comms.function_codes: [3, 4, 6, 16] — confirmed by MBRM-FCTH-EN-000 notes on reading/writing registers [3.1, 4.3]
confirmed: facts.doc_revision: 'MBRM-FCTH-EN-000 - 27 / 04 / 2021' — confirmed by document header [1.1]
confirmed: facts.identification: {'firmware_register': 'HR6', 'model_register': 'HR4'} — confirmed by MBRM-FCTH-EN-000 Holding Register 4 (Device type) and Holding Register 6 (Firmware version) [5.3, 6.1]
confirmed: facts.physical.termination: 'Software-selectable Modbus network resistor termination (NBT)' — confirmed by MBRM-FCTH-EN-000 Holding Register 9 [3.4]

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.

Device not here? Upload its manual and get a checked map back. It's free.

Want it confirmed against your own device? Order hardware verification. If it doesn't check out, you don't pay.

Building on a lot of devices? License the library — machine-readable maps, the firmware matrix, and API access.