Eliwell ICPlus 902/912/915/922 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
msk523_analogue_input_1	117	I16	0.1	°C/°F
msk523_control_setpoint_1	382	I16	0.1	°C/°F
msk523_control_setpoint_2	384	I16	0.1	°C/°F
msk523_digital_inputs_status	32882	U16	1	flag
msk523_alarms_status	32894	U16	1	flag
msk523_general_status	32895	U16	1	flag
msk523_alarm_summary	32893	U16	1	flag
msk523_regulators_status	32892	U16	1	flag
msk523_instrument_control_status	32875	U16	1	flag
msk524_analogue_input_1	115	I16	0.1	°C/°F
msk524_control_setpoint_1	381	I16	0.1	°C/°F
msk524_control_setpoint_2	383	I16	0.1	°C/°F
msk524_digital_inputs_status	32880	U16	1	flag
msk524_alarms_status	32892	U16	1	flag
msk524_general_status	32893	U16	1	flag
msk524_alarm_summary	32891	U16	1	flag
msk524_regulators_status	32890	U16	1	flag
msk524_instrument_control_status	32873	U16	1	flag
msk525_analogue_input_1	115	I16	0.1	°C/°F
msk525_control_setpoint_1	549	I16	0.1	°C/°F
msk525_control_setpoint_2	551	I16	0.1	°C/°F
msk525_digital_inputs_status	32880	U16	1	flag
msk525_alarms_status	32888	U16	1	flag
msk525_general_status	32889	U16	1	flag
msk525_alarm_summary	32887	U16	1	flag
msk525_regulators_status	32886	U16	1	flag
msk525_instrument_control_status	32873	U16	1	flag

link settings as documented (unverified): RTU; default 9600 8E2; unit ID 1; FC 03,16,43; To guarantee correct operation, the controller must be switched off and switched on again after modification of parameters Pty and bAU.

bench facts as documented (unverified)

terminals	TTL
connector	TTL
max registers/read	16
broadcast	supported
protocol notes	RW (Reading/Writing) commands are enabled by activating a timer: it is mandatory to write a WORD (containing a time in seconds) at address 109 (0x6D) before sending any command.
FC 43 device ID	supported
doc revision	rel.10/14

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

confirmed: Baud rates [4800, 9600, 19200, 38400] and default 9600 — confirmed by Eliwell ICPlus Modbus Manual (rel.10/14)
confirmed: Write timer quirk at address 109 (0x6D) — confirmed by Eliwell ICPlus Modbus Manual (rel.10/14)
confirmed: Function codes 3, 16, 43 — confirmed by Eliwell ICPlus Modbus Manual (rel.10/14)
confirmed: Device profiles msk523, msk524, msk525 — confirmed by Eliwell Televis/DeviceManager driver database

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.