Systemair SAVE/SAVECair ventilation unit

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
reg_demc_rh_highest	1000	U16	1
reg_demc_co2_highest	1001	U16	1
reg_demc_fan_speed	1002	U16	1
reg_demc_active_controller	1003	U16	1
reg_summer_winter	1038	U16	1
reg_iaq_level	1122	U16	1
reg_usermode_mode	1160	U16	1
reg_speed_manual_saf	1200	U16	1
reg_speed_manual_eaf	1201	U16	1
reg_speed_auto_saf	1202	U16	1
reg_speed_auto_eaf	1203	U16	1
reg_saf_stopped	1354	U16	1
reg_eaf_stopped	1355	U16	1
reg_tc_sp	2000	U16	0.1
reg_tc_cascade_sp	2012	U16	0.1
reg_heat_exchanger_from_satc	2140	U16	1
reg_rotor_ea_spec_humidity	2210	U16	1
reg_rotor_oa_spec_humidity	2211	U16	1
reg_sensor_fpt	12100	I16	0.1
reg_sensor_oat	12101	I16	0.1
reg_sensor_sat	12102	I16	0.1
reg_sensor_rat	12103	I16	0.1
reg_sensor_eat	12104	I16	0.1
reg_sensor_ect	12105	I16	0.1
reg_sensor_eft	12106	I16	0.1
reg_sensor_oht	12107	I16	0.1
reg_sensor_rhs	12108	U16	1
reg_sensor_co2s	12114	U16	1
reg_sensor_p_saf	12200	U16	1
reg_sensor_p_eaf	12201	U16	1
reg_sensor_flow_saf	12202	U16	1
reg_sensor_flow_eaf	12203	U16	1
reg_sensor_rpm_saf	12400	U16	1	rpm
reg_sensor_rpm_eaf	12401	U16	1	rpm
reg_sensor_pdm_eat_value	12543	U16	0.1
reg_output_saf	14000	U16	1
reg_output_eaf	14001	U16	1
reg_output_alarm	14002	U16	1
reg_output_y1_analog	14100	U16	1

bench facts as documented (unverified)

doc revision

vA001

generated by gemini:gemini-3.5-flash · harvested from https://www.rekuperatoriucentras.lt/images/Userfiles/Prekiu_dokumentai/Rekuperatoriai/Systemair/SAVE_VSR_150B/SAVECair_Modbus_parametr_srasas.pdf (Systemair); manual-faithful — the document's claims, panel risk: LOW — panel concurs, no field disagreements; proved interop-verified on 2026-06-11 · recorded 2026-06-11

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.