MBMap Registry
  1. Devices
  2. Cummins
  3. PowerCommand 3.3

Cummins PowerCommand 3.3 Modbus register map

Also covers PCC3300

Generator set control, Modbus RTU on RS485, with fault status bitmaps

  • Official
  • 2,307 registers
  • Modbus RTU
  • Revision 1 · 2026-10-15

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol
Modbus RTU
Unit ID
1default
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1
Max read
40 registers per request

Connection values are defaults: the device may be configured differently.

Map

Registers
2307 holding registers
Groups
8
Revision
1 · 2026-10-15
Added
()
File
maps/cummins/powercommand-3x.mbmap.json · 425 KB · history
SHA-256
0bd5ab8ae4a4dff18f21963b8c8e0f0299a396b244d8f38b7f16f6357263d50d
Manufacturer
cummins.com

Sources and notes

  • Modbus Register Mapping, Control · version A029X159 (Issue 26), 2020-06
    sections 13 (parametrics) and 14 (fault status bitmaps), registers marked PC 3.x; bits marked PCC3300 V2 only exist on that hardware

Source: Cummins, Modbus Register Mapping (Control), A029X159 Issue 26 (6-2020): sections 13 and 14

  • Addresses are the manual's 4xxxx numbers less 40000, 1-based (40011 is holding register 11).
  • 32-bit values have the high register first. Write both registers, high then low.
  • Text values the manual lists as one character per register (serial numbers, time stamps) are left out.
  • The manual does not give the factory serial settings: check baud rate, parity, stop bits and node address on the control.
  • Save Trims writes the settings to flash memory, which wears out: use it only after a change, never on a schedule.
  • Registers missing from older control software answer with an exception.
  • Not available, out of range, network failure and hardware failure readings are the highest values of each type (section 13.2), declared as sentinels.
  • 793 one-character text registers left out.
AreaAddressNameTypeAccessUnitScaleDescription
HR 10 uint16 R
HR 11 uint16 R
HR 12 uint16 R
HR 13 uint16 R
HR 14 int16 R % ×0.01
HR 16 uint16 R
HR 17 uint16 R
HR 18 uint16 R V
HR 19 uint16 R V
HR 20 uint16 R V
HR 21 uint16 R V
HR 22 uint16 R V
HR 23 uint16 R V
HR 24 uint16 R V
HR 25 uint16 R V
HR 26 uint16 R A
HR 27 uint16 R A
HR 28 uint16 R A
HR 29 uint16 R A
HR 30 uint16 R A
HR 31 int16 R kW
HR 32 int16 R kW
HR 33 int16 R kW
HR 34 int16 R kW
HR 35 int16 R kVAR
HR 36 int16 R kVAR
HR 37 int16 R kVAR
HR 38 int16 R kVAR
HR 39 int16 R ×0.01
HR 40 uint16 R kVA
HR 41 uint16 R kVA
HR 42 uint16 R kVA
HR 43 uint16 R kVA
HR 44 uint16 R Hz ×0.01
HR 46 uint32 ABCD R kWh
HR 48 uint32 ABCD R kWh
HR 50 int32 ABCD R kWh
HR 52 uint32 ABCD R kVARh
HR 54 uint32 ABCD R kVARh
HR 56 int32 ABCD R kVARh
HR 58 uint16 R % ×0.1
HR 59 uint16 R % ×0.1
HR 60 uint16 R % ×0.1
HR 61 uint16 R V ×0.1
HR 62 uint16 R kPa
HR 63 int16 R °F ×0.1
HR 64 int16 R °C ×0.1
HR 65 int16 R °F ×0.1
HR 66 int16 R °F ×0.1
HR 67 int16 R gal/h ×0.05
HR 68 uint16 R rpm
HR 69 uint16 R
HR 70 uint32 ABCD R s ×0.1
HR 72 uint32 ABCD R gal ×0.1
HR 74 uint32 ABCD R
HR 118 uint16 R V
HR 119 uint16 R V
HR 120 uint16 R V
HR 121 uint16 R V
HR 122 uint16 R V
HR 123 uint16 R V
HR 124 uint16 R V
HR 125 uint16 R V
HR 126 uint16 R A
HR 127 uint16 R A
HR 128 uint16 R A
HR 129 uint16 R A
HR 131 int16 R kW
HR 132 int16 R kW
HR 133 int16 R kW
HR 134 int16 R kW
HR 135 int16 R kVAR
HR 136 int16 R kVAR
HR 137 int16 R kVAR
HR 138 int16 R kVAR
HR 139 int16 R ×0.01
HR 140 uint16 R kVA
HR 141 uint16 R kVA
HR 142 uint16 R kVA
HR 143 uint16 R kVA
HR 144 uint32 ABCD R Hz ×0.001
HR 146 uint32 ABCD R kWh
HR 148 uint32 ABCD R kWh
HR 150 int32 ABCD R kWh
HR 152 uint32 ABCD R kVARh
HR 154 uint32 ABCD R kVARh
HR 156 int32 ABCD R kVARh
HR 158 uint16 R V
HR 159 uint16 R V
HR 160 uint16 R V
HR 161 uint16 R V
HR 162 uint16 R V
HR 163 uint16 R V
HR 164 uint16 R V
HR 165 uint16 R V
HR 166 uint16 R A
HR 167 uint16 R A
HR 168 uint16 R A
HR 169 uint16 R A
HR 171 int16 R kW

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