DEIF AGC genset controller (Modbus H2/H9)

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
generator_voltage_l1_l2	501	U16	1
generator_voltage_l2_l3	502	U16	1
generator_voltage_l3_l1	503	U16	1
generator_voltage_l1_n	504	U16	1
generator_voltage_l2_n	505	U16	1
generator_voltage_l3_n	506	U16	1
generator_frequency_l1	507	U16	0.01
generator_frequency_l2	508	U16	0.01
generator_frequency_l3	509	U16	0.01
generator_current_l1	513	U16	1
generator_current_l2	514	U16	1
generator_current_l3	515	U16	1
generator_power_l1	516	I16	1
generator_power_l2	517	I16	1
generator_power_l3	518	I16	1
generator_power_total	519	I16	1
generator_reactive_power_total	523	I16	1
generator_apparent_power_total	527	U16	1
generator_power_factor	538	I16	0.01
busbar_voltage_l1_l2	539	U16	1
busbar_voltage_l2_l3	540	U16	1
busbar_voltage_l3_l1	541	U16	1
busbar_frequency_l1	545	U16	0.01
absolute_run_hours	554	U32BE	1
rpm	576	U16	1

link settings as documented (unverified): RTU/ASCII; baud 9600/19200; FC 01,02,03,04,15,16; Modbus protocol type can be changed from RTU to ASCII in menu 7510. Option H2 provides RS-485, Option H9 provides RS-232.

bench facts as documented (unverified)

terminals	Option H2 (AGC/GPC/GPU/PPM/PPU): Terminals 29 (DATA+ A), 30 (DATA GND), 31 (DATA- B), 33 (DATA+ A), 35 (DATA- B). Option H2 (AGC 100): Terminals 49 (DATA- B), 50 (DATA GND), 51 (DATA+ A). Option H9: Terminals 30 (DATA GND), 32 (TxD), 34 (RxD).
A/B polarity	DATA+ (A), DATA- (B)
connector	Screw terminals
wiring notes	Terminals 29 and 33 are internally connected, as are 31 and 35.
protocol notes	If communication fails, the unit will operate according to the last received data.
identification notes	Covers AGC-3, AGC 100, GPC-3/GPU-3 Hydro, GPU-3/PPU-3, and PPM-3.
doc revision	4189340442Z

generated by gemini:gemini-3.5-flash · harvested from https://www.deif.com/media/qmtcw1ih/option-h2-and-h9-modbus-communication-4189340442-uk.pdf (DEIF); 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.