Fronius GEN24/Datamanager inverter

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
der_type	133	U16	1	A
w_rtg	134	F32BE	1	W
var_rtg	136	F32BE	1	VA
var_rtg_q1	138	F32BE	1	VAr
var_rtg_q4	141	F32BE	1
a_rtg	143	F32BE	1	A
pf_rtg_q1	145	F32BE	1
pf_rtg_q4	148	F32BE	1
v_ref	162	F32BE	1	V
v_ref_ofs	163	F32BE	1	V
pv_conn	193	U16	1
ecp_conn	195	U16	1
st_act_ctl	226	U16	1
conn_win_tms	239	U16	1	s
conn_rvrt_tms	240	U16	1	s
conn	241	U16	1
w_max_lim_pct	242	F32BE	1	%
w_max_lim_pct_win_tms	243	U16	1	s
w_max_lim_pct_rvrt_tms	244	U16	1	s
w_max_lim_ena	246	U16	1
out_pf_set	247	F32BE	1
out_pf_set_win_tms	248	U16	1
out_pf_set_rvrt_tms	249	U16	1
out_pf_set_ena	251	U16	1
var_max_pct	253	F32BE	1
var_pct_win_tms	255	U16	1
var_pct_rvrt_tms	256	U16	1
var_pct_mod	258	U16	1
var_pct_ena	259	U16	1

link settings as documented (unverified): RTU/TCP; unit ID 1; FC 03,06,16; Modbus TCP via Ethernet (wired or WLAN), Modbus RTU via RS-485. Default Unit ID for inverter is 1, default Unit ID for energy meter is 200.

⚠ If an attempt is made to write to read-only or unsupported registers, the inverter does not return an exception code and the values are ignored without an error message. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	RS-485 (EIA/TIA-485-A)
wiring notes	Modbus TCP over Ethernet (wired or WLAN), Modbus RTU over RS-485
max registers/read	125
response timeout	1000 ms
broadcast	supported
protocol notes	Modbus requests should only be executed sequentially and not in parallel (maximum 2 queries in parallel).
identification notes	SunSpec Basic Register starts at 40001. Register 40005 is Mn (Manufacturer).
power	Primo GEN24 208-240 3.8-10.0 kW

generated by gemini:gemini-3.5-flash · harvested from https://www.fronius.com/~/downloads/Solar%20Energy/Operating%20Instructions/42,0410,2649.pdf (Fronius); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; 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.