Cummins PowerCommand PCC1301 genset 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
genset_control_switch_position	9	U16	1	Switch position
genset_operating_state	10	U16	1	Operating state
fault_code	11	U16	1	Event code
fault_type	12	U16	1	Fault type
alternator_voltage_l_n_a	17	U16	1	AC Volts
alternator_voltage_l_n_b	18	U16	1	AC Volts
alternator_voltage_l_n_c	19	U16	1	AC Volts
alternator_voltage_l_l_ab	21	U16	1	AC Volts
alternator_voltage_l_l_bc	22	U16	1	AC Volts
alternator_voltage_l_l_ca	23	U16	1	AC Volts
alternator_voltage_regulation	24	U16	1	AC Volts
alternator_current_a	25	U16	0.1	AC Amps
alternator_current_b	26	U16	0.1	AC Amps
alternator_current_c	27	U16	0.1	AC Amps
alternator_average_current	28	U16	0.1	AC Amps
alternator_kva_a	39	U16	0.1	kVA
alternator_kva_b	40	U16	0.1	kVA
alternator_kva_c	41	U16	0.1	kVA
alternator_kva_total	42	U16	0.1	kVA
alternator_frequency	43	U16	0.1	Hz
control_battery_voltage	60	U16	0.1	DC Volts
engine_oil_pressure	61	U16	1	kPa
engine_coolant_temperature	63	U16	0.1	Degrees Celsius
engine_speed	67	U16	0.1	RPM
engine_starts	68	U16	1	Number of starts
engine_runtime_high_byte	69	U16	1	Sec
engine_runtime_low_byte	70	U16	1	Sec

link settings as documented (unverified): RTU; default 19200 8E1; unit ID 1; FC 03,06,08,16; Two-wire RS485 master/slave multi-drop bus.

bench facts as documented (unverified)

terminals	Hi (+) TB2-3, Lo (-) TB2-4, Shield TB2-1
wiring notes	Two-wire RS485
max registers/read	40
response timeout	100 ms
protocol notes	The external device can read 1-40 contiguous registers, write 1-40 contiguous registers.
model register	43033
serial register	43049
doc revision	A029X159 (Issue 7)

generated by gemini:gemini-3.5-flash · harvested from https://www.ccontrols.com/support/dp/modbus2300.pdf (Cummins); 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.