Regin Regio Midi 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 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	unit
rc_actual_x_regio_fan_switch	5	U16	1
rc_actual_x_regio_unit_state	6	U16	1	%
rc_actual_x_regio_controller_state	7	U16	1	%
rc_actual_x_regio_fan_speed	8	U16	1	%
rc_actual_r_regio_room_temp	10	I16	0.1
rc_actual_r_regio_room_temp_ext	11	I16	0.1
rc_actual_r_regio_room_temp_int	12	I16	0.1
rc_actual_r_regio_ai_change_over	13	I16	0.1
rc_actual_r_regio_ana_in1	14	I16	0.1
rc_actual_r_regio_u_ana_in1	15	I16	1
rc_actual_r_regio_set_p_adjustment	18	I16	0.1
rc_actual_r_regio_pid_set_p	19	I16	0.1
rc_actual_r_regio_pid_output	20	I16	1	%
rc_actual_r_regio_heat_output	21	I16	1	%
rc_actual_r_regio_cool_output	22	I16	1	%
rc_actual_r_regio_room_co2	31	I16	1	ppm
rc_actual_r_regio_volt_input	44	I16	0.1	V
rc_actual_r_regio_room_flow	45	I16	0.1	ms
rc_actual_r_regio_supply_air_temp	46	I16	0.1	ms
rc_setp_x_regio_fan_select	4	U16	1
rc_setp_r_regio_occ_set_p_heat	67	I16	0.1	°C
rc_setp_r_regio_occ_set_p_cool	68	I16	0.1	°C
rc_setp_r_regio_standby_set_p_dead_band	69	I16	0.1	°C
rc_setp_r_regio_un_occ_set_p_heat	70	I16	0.1	°C
rc_setp_r_regio_un_occ_set_p_cool	71	I16	0.1	°C
rc_setp_r_regio_frost_set_p	72	I16	0.1	°C
rc_setp_r_regio_setpoint_offset_pos	73	I16	0.1	°C
rc_setp_r_regio_setpoint_offset_neg	74	I16	0.1	°C
rc_setp_r_regio_set_p_offset	75	I16	0.1	°C

link settings as documented (unverified): RTU; FC 01,02,03,04,05,06,15,16; The Midi controller automatically switches between EXOline and Modbus depending on the present communication type, without any communication error.

bench facts as documented (unverified)

terminals	A and B, protective earth (N)
A/B polarity	A -> A and B -> B. Incorrect polarity will just give nonfunction but cannot harm either unit.
shield/ground	protective earth (N on EXO controllers)
response timeout	5 ms
inter-frame delay	3 ms
model register	Input Register 1
firmware register	Input Register 5
power	24 V AC
doc revision	Revision B, 2018-02-16

generated by gemini:gemini-3.5-flash · harvested from https://www.regincontrols.com/globalassets/pimmediafiles/documents/regio_midi_variable_list.pdf (Regin); 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.