Cummins PowerCommand PCC1301 genset controller

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
Alarm Event 1	0	U16	1
Alarm Event 2	1	U16	1
Save adjustments	3	U16	1
Genset control run/off/auto switch position	9	U16	1
Genset operating state	10	U16	1
Fault Code	11	U16	1
Fault Type	12	U16	1
NFPA 110 fault register	15	U16	1
Extended Annunciation fault register	16	U16	1
Alternator output voltage line to neutral (a phase)	17	U16	1	AC Volts
Alternator output voltage line to neutral (b phase)	18	U16	1	AC Volts
Alternator output voltage line to neutral (c phase)	19	U16	1	AC Volts
Alternator output voltage line to line (a to b phase)	21	U16	1	AC Volts
Alternator output voltage line to line (b to c phase)	22	U16	1	AC Volts
Alternator output voltage line to line (c to a phase)	23	U16	1	AC Volts
Alternator output voltage (used for voltage regulation)	24	U16	1	AC Volts
Alternator output current (phase a)	25	U16	0.1	AC Amps
Alternator output current (phase b)	26	U16	0.1	AC Amps
Alternator output current (phase c)	27	U16	0.1	AC Amps
Alternator output average current	28	U16	0.1	AC Amps
Alternator output volt-amperes (phase a)	39	U16	0.1	kVA
Alternator output volt-amperes (phase b)	40	U16	0.1	kVA
Alternator output volt-amperes (phase c)	41	U16	0.1	kVA
Alternator output volt-amperes (total)	42	U16	0.1	kVA
Alternator frequency	43	U16	0.1	Hz
Genset Total kVAh	55	U32BE	1	kVAh
Alternator output current (phase a)	57	U16	0.1	% of nominal
Alternator output current (phase a)	58	U16	0.1	% of nominal
Alternator output current (phase c)	59	U16	0.1	% of nominal
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
Number of engine starts	68	U16	1	Number of starts
Engine runtime (high byte)	69	U16	1	Sec
Engine Runtime (Low byte)	70	U16	1	Sec
Genset start stop control via Modbus	299	U16	1
Genset E-stop switch via Modbus	301	U16	1
MB Logical Read Address	2000	U16	1
MB Logical Read Data	2001	U32BE	1
Device Type	2008	U16	1
Software Version	2009	U16	0.0001
Current Fault Status	2011	U16	1
Genset L1N Voltage	2017	U16	1	Volts
Genset L2N Voltage	2018	U16	1	Volts
Genset L3N Voltage	2019	U16	1	Volts
Genset LN Average Voltage	2020	U16	1	Volts
Genset L1L2 Voltage	2021	U16	1	Volts
Genset L2L3 Voltage	2022	U16	1	Volts
Genset L3L1 Voltage	2023	U16	1	Volts
Genset LL Average Voltage	2024	U16	1	Volts
Genset L1 Current	2025	U16	1	Amps
Genset L2 Current	2026	U16	1	Amps
Genset L3 Current	2027	U16	1	Amps
Genset Average Current	2028	U16	1	Amps
Genset L1 kW	2029	I16	1	kW
Genset L2 kW	2030	I16	1	kW
Genset L3 kW	2031	I16	1	kW
Genset Total kW	2032	I16	1	kW
Genset L1 kVAR	2033	I16	1	kVAR
Genset L2 kVAR	2034	I16	1	kVAR
Genset L3 kVAR	2035	I16	1	kVAR
Genset Total kVAR	2036	I16	1	kVAR
Genset Total Power Factor	2037	I16	0.01
Genset L1 kVA	2038	U16	1	kVA
Genset L2 kVA	2039	U16	1	kVA
Genset L3 kVA	2040	U16	1	kVA
Genset Total kVA	2041	U16	1	kVA
MB Genset Frequency	2042	U16	0.1	Hz
Genset Total Negative kWh	2043	U32BE	1	kWh
Genset Total Positive kWh	2045	U32BE	0.1	kWh
Genset Total Net kWh	2047	I32BE	1	kWh
Genset Total Negative kVARh	2049	U32BE	1	kVARh
Genset Total Positive kVARh	2051	U32BE	1	kVARh
Genset Total Net kVARh	2053	I32BE	1	kVARh
Genset Available Current	2057	U16	1	Amps
Genset L1 Current Percent	2058	U16	0.1	%
Genset L2 Current Percent	2059	U16	0.1	%
Genset L3 Current Percent	2060	U16	0.1	%
Genset Total kW Percent	2061	I16	0.1	%
Genset Frequency Percent	2062	U16	0.1	%
Genset L1L2 Voltage%	2063	U16	0.1	%
Genset L2L3 Voltage%	2064	U16	0.1	%
Genset L3L1 Voltage%	2065	U16	0.1	%
Nominal alternator voltage setting	2999	U16	1	AC Volts
Nominal alternator frequency setting	3000	U16	1	Hz
Alternator phase setting	3001	U16	1	# of phases
Alternator connection setting	3002	U16	1	Alternator
Glow plug driver feature enable	3003	U16	1
Battery charging alternator fault enable	3004	U16	1
Remote start time delay	3005	U16	1	Sec
Remote stop time delay	3006	U16	1	Sec
Engine starting - cycle crank attempts setting	3007	U16	1	Number of attemp
Engine starting - cycle crank time setting	3008	U16	1	Sec
Engine starting - cycle crank rest time setting	3009	U16	1	Sec
Fault bypass (battle short) feature enable	3010	U16	1
Fault bypass (battle short) switch input assignment	3011	U16	1
Automatic voltage regulator Enable	3012	U16	1
Automatic voltage regulator volts per hertz roll off knee setting	3013	U16	0.1	Hz
Automatic voltage regulator volts per hertz roll off slope setting	3014	U16	0.1	%V/Hz
Automatic voltage regulator gain setting	3015	U16	1	%
Automatic voltage regulator integral setting	3016	U16	1
Automatic voltage regulator derivative setting	3017	U16	1
Electronic governing enable	3018	U16	1
Electronic governing initial duty cycle setting	3019	U16	0.1
Electronic governing initial duty cycle time	3020	U16	0.1	Sec
Electronic governing start ramp duty cycle setting	3021	U16	0.1	%
Electronic governing maximum duty cycle setting	3022	U16	0.1	%
Electronic governing gain setting	3023	U16	1	%
Electronic governing integral setting	3024	U16	1	%
Electronic governing derivative setting	3025	U16	1	%
Electronic governing crank exit fuel duty cycle setting	3026	U16	0.1	%
Electronic governing dither factor setting	3027	U16	1	%
Electronic governing start ramp time setting	3028	U16	0.01	Sec
Electronic governing enable engine speed	3029	U16	1	RPM
Electronic governing minimum duty cycle setting	3030	U16	1	%
Electronic governing maximum duty cycle setting	3031	U16	1	%
Model number character #1	3032	U16	1
Model number character #2	3033	U16	1
Serial number character #1	3048	U16	1
Serial number character #2	3049	U16	1
Configurable input #1 type	3064	U16	1
Configurable input #2 type	3065	U16	1
Configurable output #1 event code number	3066	U16	1
Configurable output #2 fault event number	3067	U16	1
60 Hz alternator output voltage adjust %	3068	U16	1	%
50 Hz alternator output voltage adjust %	3069	U16	0.1	%
Alternator frequency adjustment %	3070	U16	0.1
60 Hz line 1 to neutral metering voltage calibration	3071	U16	0.0001	%
60 Hz line 2 to neutral metering voltage calibration	3072	U16	0.0001	%
50 Hz line 1 to neutral metering voltage calibration	3074	U16	0.0001	%
50 Hz line 2 to neutral metering voltage calibration	3075	U16	0.0001	%
50 Hz line 3 to neutral metering voltage calibration	3076	U16	0.0001	%
60 Hz line 1 metering current calibration	3077	U16	0.001	%
60 Hz line 2 metering current calibration	3078	U16	0.001	%
60 Hz line 3 metering current calibration	3079	U16	0.001	%
50 Hz line 1 metering current calibration	3080	U16	0.001	%
50 Hz line 2 metering current calibration	3081	U16	0.001	%
50 Hz line 3 metering current calibration	3082	U16	0.001	%
Annunciator configurable input #1 type	3083	U16	1
Annunciator configurable input #2 type	3084	U16	1
Annunciator configurable input #3 type	3085	U16	1
Annunciator configurable output #1 event code number	3086	U16	1
Annunciator configurable output #2 event code number	3087	U16	1
Annunciator configurable output #3 event code number	3088	U16	1
Annunciator configurable output #4 event code number	3089	U16	1

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)

⚠ disputed: The external device can read 1-40 contiguous registers — disputed by Cummins Modbus Register Mapping Guide (A029X159) which explicitly states 'The master device can read 1-16 contiguous registers, write 1-16 contiguous registers' for the PCC1301/PowerCommand 1.x/PS0500 map, whereas 1-40 contiguous registers applies to other controllers like PowerCommand 2.x/3.x

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

The PCC1301 control does not support fault reset commands through the Modbus registers. [source]
confirmed: Physical terminals Hi (+) TB2-3, Lo (-) TB2-4, Shield TB2-1 — confirmed by Cummins PCC1301 Operator and Installation Manual and OmniMetrix TrueGuard-PRO Installation Guide
confirmed: Baud rates [2400, 4800, 9600, 19200] and default baud 19200 — confirmed by Cummins PCC1301 Owner Manual (Modbus Submenus section)
confirmed: Modbus RTU protocol on a two-wire RS485 multi-drop bus — confirmed by Cummins Modbus Register Mapping Guide (A029X159)

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.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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