Regin Corrigo/Exigo heating controller

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.

structure-verified

Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.

point	address (0-based)	type	scale	unit
outdoor_temp	1	I16	0.1	°C
heating_primary_supply_temp	358	I16	0.1	°C
heating_primary_return_temp	359	I16	0.1	°C
cooling_primary_supply_temp	360	I16	0.1	°C
cooling_primary_return_temp	361	I16	0.1	°C
supply_temp_hs1	2	I16	0.1	°C
outdoor_compensated_setpoint_supply_temp_hs1	3	I16	0.1	°C
room_temp_hs1	4	I16	0.1	°C
setpoint_room_temp_hs1	17	I16	0.1	°C
return_temp_hs1	5	I16	0.1	°C
control_signal_hs1_cv	153	I16	0.1	V
controller_output_hs1	160	I16	0.1	%
supply_temp_hs2	6	I16	0.1	°C
outdoor_compensated_setpoint_supply_temp_hs2	7	I16	0.1	°C
room_temp_hs2	8	I16	0.1	°C
return_temp_hs2	9	I16	0.1	°C
control_signal_hs2_cv	154	I16	0.1
controller_output_hs2	161	I16	0.1
supply_temp_hs3	10	I16	0.1	°C
outdoor_compensated_setpoint_supply_temp_hs3	11	I16	0.1	°C
room_temp_hs3	12	I16	0.1	°C
return_temp_hs3	13	I16	0.1	°C
control_signal_hs3_cv	155	I16	0.1
controller_output_hs3	162	I16	0.1
supply_temp_hwc1	14	I16	0.1	°C
setpoint_supply_hwc1	52	I16	0.1
control_signal_hw1_cv	156	I16	0.1
controller_output_hw1	163	I16	0.1
supply_temp_hwc2	15	I16	0.1	°C
setpoint_supply_hwc2	53	I16	0.1
control_signal_hwc2_cv	157	I16	0.1
controller_output_hwc2	164	I16	0.1
supply_temp_hp1	16	I16	0.1	°C
return_temp_hp1	17	I16	0.1	°C
boiler_temp	18	I16	0.1
boiler_return_temp	356	I16	0.1
boiler_supply_temp	394	I16	0.1
difference_pressure	19	I16	0.1
wind_speed	20	I16	0.1
energy_consumption_mwh	65	I16	0.1
water_consumption_m3	66	I16	0.1
power_usage_instant	27	I16	0.1
cold_water_1_consumption_m3	67	I16	0.1
cold_water_1_flow	30	I16	0.1
cold_water_2_consumption_m3	68	I16	0.1
cold_water_2_flow	36	I16	0.1
electric_consumption_mwh	69	I16	0.1
leakage_power	42	I16	0.1

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 01,02,03,04,05,06,15,16; Corrigo/Exigo uses the same port for communication via Modbus and via EXOline. The input port will automatically adapt itself after approx. 1 second and remain in EXO-mode until no communication has taken place for 10 seconds, after which it will revert to Modbus mode.

bench facts as documented (unverified)

wiring notes	For Modbus, the bottom layer can be RS485, RS422 or RS232.
max registers/read	47
inter-frame delay	16 ms
protocol notes	The Modbus master must wait for a minimum of 3.5 character times (4 ms at 9600 bps) between two messages. When communicating with more than one controller on the same RS485 line, the master must wait for a minimum of 14 character times (16 ms at 9600 bps) between the answer and the first question for the next controller. The controller is limited to 10 fast communications every 30 seconds; other communications will have a delayed answer time of approximately 1 second.
doc revision	Revision 14, January 2015
firmware applicability	From version 3.4

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

confirmed: Baud rates [9600], default 9600, default unit ID 1, framing RTU, parity N, stop bits 1 — confirmed by Regin Corrigo heating and Exigo manual (Revision 14, January 2015)
confirmed: EXOline auto-adapt port behavior (adapts after ~1s, remains in EXO-mode until 10s inactivity, then reverts to Modbus) — confirmed by Regin Corrigo heating and Exigo manual and SAUTER flexotron800 V2 Heating manual
confirmed: Inter-frame delay and multi-controller RS485 line timing (3.5 character times / 4 ms at 9600 bps between messages, 14 character times / 16 ms at 9600 bps between answer and next question) — confirmed by Regin Corrigo heating and Exigo manual
confirmed: Communication limits (limited to 10 fast communications every 30 seconds, others delayed by ~1 second) — confirmed by Regin Corrigo heating and Exigo manual
confirmed: Maximum read registers limit of 47 — confirmed by Regin Corrigo heating and Exigo manual
confirmed: outdoor_temp @ 1 (Input Register, type 4) — confirmed by Regin Corrigo heating and Exigo manual
confirmed: supply_temp_hs1 @ 2 (Input Register, type 4) — confirmed by Regin Corrigo heating and Exigo manual
confirmed: outdoor_compensated_setpoint_supply_temp_hs1 @ 3 (Input Register, type 4) — confirmed by Regin Corrigo heating and Exigo 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.
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.

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