Eliwell EW 4800 series controller

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 confirmed at the hardware-verified rung and at no rung below it.

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
analogue_input_control	298	I16	0.1	°C/°F
analogue_output	1486	U16	1	num
contatore_autorepeat	408	U16	1	num
regulation_set_point_1	16392	I16	0.1	°C/°F
offset_on_set_point_1	16394	I16	0.1	°C/°F
tripping_band_above_set_point_1	16396	U16	0.1	°C/°F
differential_of_set_point_1	16398	I16	0.1	°C/°F
maximum_value_settable_for_set_point_1	16400	I16	0.1	°C/°F
minimum_value_settable_for_set_point_1	16402	I16	0.1	°C/°F
max_alarm_regulator_1	16404	I16	0.1	°C/°F
min_alarm_regulator_1	16406	I16	0.1	°C/°F
regulation_set_point_2	16408	I16	0.1	°C/°F
offset_on_set_point_2	16410	I16	0.1	°C/°F
tripping_band_above_set_point_2	16412	U16	0.1	°C/°F
differential_of_set_point_2	16414	I16	0.1	°C/°F
maximum_value_settable_for_set_point_2	16416	I16	0.1	°C/°F
minimum_value_settable_for_set_point_2	16418	I16	0.1	°C/°F
max_alarm_regulator_2	16420	I16	0.1	°C/°F
min_alarm_regulator_2	16422	I16	0.1	°C/°F

link settings as documented (unverified): RTU; default 9600 8E1; unit ID 1; FC 03,16,43; If parameters PtS, PtY and Stp are changed, the controller must be turned off and then on again after they are changed to operate correctly.

bench facts as documented (unverified)

terminals	RS485 cable shielded and twisted (e.g.: Belden cable model 8762)
connector	5-path connector TTL cable (30cm)
wiring notes	Bus Adapter BA150
max registers/read	60
broadcast	supported
protocol notes	Parameters belonging to two different non-consecutive blocks cannot be read using a single command.
identification notes	Field code 0: Manufacturer ID ('Invensys'), Field code 1: Instrument model ID ('003E_000A'), Field code 2: Instrument version ID ('00F8_0011')
FC 43 device ID	supported
doc revision	2010/04/0

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

confirmed: Baud rate of 9600 and default baud of 9600 — confirmed by Eliwell EW 4800 Modbus Manual [1.1.1]
confirmed: Default unit ID of 1 — confirmed by default parameters FAA=0 and dEA=1 (FAA * 16 + dEA = 1) in Eliwell EW 4800 Modbus Manual
confirmed: Modbus RTU framing and function codes 3, 16, 43 — confirmed by Eliwell EW 4800 Modbus Manual
confirmed: Power cycle requirement after changing PtS, PtY, and Stp — confirmed by Eliwell EW 4800 Modbus Manual
confirmed: Default parity 'E' and stop bits 1 — confirmed by Eliwell EW 4800 Modbus Manual
confirmed: Document revision '2010/04/0' — confirmed by Eliwell EW 4800 Modbus Manual footer
confirmed: Device identification fields (Manufacturer ID 'Invensys', Model ID '003E_000A', Version ID '00F8_0011') — confirmed by Eliwell EW 4800 Modbus Manual
confirmed: Physical connection via 5-path connector TTL cable (30cm), Bus Adapter BA150, and Belden 8762 RS485 cable — confirmed by Eliwell EW 4800 Modbus Manual

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.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.