Cummins PowerCommand 1.1-3.3 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 confirmed at the hardware-verified rung and at no rung below it.

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
control_switch_position	9	U16	1	V
genset_run_sequence_state	10	U16	1	V
most_recent_fault_or_warning	11	U16	1	V
genset_standby_total_kw_percent	13	I16	0.01	A
nfpa_110_logical_status	15	U16	1	kVA
extended_nfpa_110_logical_status	16	U16	1	Hz
genset_l1n_voltage	17	U16	1	%
genset_l2n_voltage	18	U16	1	%
genset_l3n_voltage	19	U16	1	%
genset_ln_average_voltage	20	U16	1	kW
genset_l1l2_voltage	21	U16	1
genset_l2l3_voltage	22	U16	1	V
genset_l3l1_voltage	23	U16	1	psi
genset_ll_average_voltage	24	U16	1	degF
genset_l1_current	25	U16	1	degF
genset_l2_current	26	U16	1	GPH
genset_l3_current	27	U16	1	Gallons
genset_average_current	28	U16	1	RPM
genset_neutral_current	29	U16	1
genset_l1_kw	30	I16	1	Hours
genset_l2_kw	31	I16	1
genset_l3_kw	32	I16	1
genset_total_kw	33	I16	1
genset_l1_kvar	34	I16	1
genset_l2_kvar	35	I16	1
genset_l3_kvar	36	I16	1
genset_total_kvar	37	I16	1
genset_total_power_factor	38	I16	0.01
genset_l1_kva	39	U16	1
genset_l2_kva	40	U16	1
genset_l3_kva	41	U16	1
genset_total_kva	42	U16	1
genset_frequency	43	U16	0.01
genset_total_negative_kwh	45	U32BE	1
genset_total_positive_kwh	47	U32BE	1
genset_total_net_kwh	49	U32BE	1
genset_total_negative_kvarh	51	U32BE	1
genset_total_positive_kvarh	53	U32BE	1
genset_total_net_kvarh	55	U32BE	1
genset_standby_l1_current_percent	57	U16	0.1
genset_standby_l2_current_percent	58	U16	0.1
genset_standby_l3_current_percent	59	U16	0.1
battery_voltage	60	U16	0.1
oil_pressure	61	U16	1
oil_temperature	62	I16	0.1
coolant_temperature	63	I16	0.1
intake_manifold_temperature	64	I16	0.1
fuel_temperature	65	I16	0.1
fuel_rate	66	I16	0.05
average_engine_speed	67	U16	1
total_start_attempts	68	U16	1
engine_running_time	69	U32BE	0.1
total_fuel_consumption	71	U32BE	0.1
total_number_of_runs	73	U32BE	1

link settings as documented (unverified): RTU/TCP; default 19200 8E1; unit ID 1; FC 03,04,06,08,16; MCM3320 default baud is 19200 with even parity, 1 stop bit. AUX101/102 default Modbus address is 13.

⚠ Cummins controllers that have Modbus RS485 Communication built-in have a dedicated Modbus holding register for 'Save Trims'. The number of write cycles on any flash memory device are finite. Only save trims once all configuration changes are complete. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	PCC 1301: TB2-3 (A+), TB2-4 (B-), TB2-1 (Common). PS0500/PowerCommand 1.x/PS0600: TB15-3 (A+), TB15-4 (B-), TB15-1 (Common).
A/B polarity	A (+), B (-)
wiring notes	Two-wire RS485 multi-drop bus
max registers/read	125
response timeout	100 ms
protocol notes	MCM3320 is capable of supporting communication transactions within 10 seconds following initial power-up. Response time is within 100 ms.
model register	40002
serial register	43220
firmware register	42010
doc revision	A029X159 (Issue 26), 6-2020

field reports — community-sourced, unverified (checked 2026-06-11)

PCC 1.x (1302) controllers require a physical jumper wire between TB15-1 and TB15-5 to disable sleep mode and keep the RS485 port active at all times for Modbus communication. [source]
Writing Modbus commands faster than 625 ms can cause the ModLon II Gateway (used to interface PowerCommand networks to Modbus) to lock up, requiring a power cycle or reset. [source]
confirmed: Document revision A029X159 (Issue 26), 6-2020 — confirmed by official Cummins Modbus Register Mapping manual [1.1.1]
confirmed: MCM3320 default baud is 19200 with even parity, 1 stop bit — confirmed by MCM3320 Modbus Register Map specification
confirmed: AUX101/102 default Modbus address is 13 — confirmed by A029X159 manual
confirmed: Save Trims flash memory warning — confirmed by A029X159 manual section 2.1
confirmed: Physical terminals for PCC 1301 (TB2-3, TB2-4, TB2-1) and PS0500/PowerCommand 1.x/PS0600 (TB15-3, TB15-4, TB15-1) — confirmed by Cummins Operator and Installation manuals
confirmed: Identification registers (firmware_register 42010, model_register 40002, serial_register 43220) — confirmed by A029X159 register map
confirmed: Register map summary (e.g., control_switch_position @ 9, genset_run_sequence_state @ 10, most_recent_fault_or_warning @ 11, etc.) — confirmed by PowerCommand 2.x/3.x Modbus Register Map

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.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.