Eurotherm 2404/2408 controller (needs comms module)

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
process_variable	1	I16	1
target_setpoint	2	I16	1
output_level	3	I16	1
working_setpoint	5	I16	1
valve_position	53	I16	1
heater_current	80	I16	1
alarm_1_setpoint	13	I16	1
alarm_2_setpoint	14	I16	1
alarm_3_setpoint	81	I16	1
alarm_4_setpoint	82	I16	1
auto_manual_select	273	U16	1
fast_status_byte	74	U16	1
summary_output_status_word	75	U16	1
control_status_word	76	U16	1
instrument_status_word	77	U16	1
digital_input_status_word	87	U16	1
input_1_measured_value	202	I16	1
input_2_measured_value	208	I16	1
input_1_cold_junction_temp	215	I16	1
input_2_cold_junction_temp	216	I16	1
process_variable_float	32770	F32BE	1
target_setpoint_float	32772	F32BE	1
output_level_float	32774	F32BE	1
working_setpoint_float	32778	F32BE	1
valve_position_float	32874	F32BE	1
heater_current_float	32928	F32BE	1

link settings as documented (unverified): RTU; baud 1200/2400/4800/9600/19200; FC 03,04,16

⚠ Broadcast is only recommended for systems where failure to communicate a value due to physical failure of wiring or other equipment will not cause damage to equipment. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	HF, HE, HD for RS232/RS485; F1-F5/HE, HF, HB, HC, HD for RS422
A/B polarity	RX+, RX-, TX+, TX- for RS422; HF (B/B+), HE (A/A+) for RS485
termination	220 ohm termination resistor on Rx terminals of last controller in chain
isolation	fully isolated communications circuitry
shield/ground	copper braid shield connected to a noise free ground
broadcast	supported
protocol notes	For 2400 firmware versions 3.00 and greater, a facility allows block writes to continue even if values in the block are not currently writeable by writing 1 to register 220.
model register	12544
doc revision	Part No HA026230 Issue 2.0 Feb-00
firmware applicability	2400 firmware versions 3.00 and greater

generated by gemini:gemini-3.5-flash · harvested from http://buphy.bu.edu/~stein/etherm/2000cmms.pdf (Eurotherm); 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.