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  3. PCC 1301

Cummins PCC 1301 Modbus register map

Also covers PCC1301, PowerCommand 1301

Generator set control, Modbus RTU on RS485 (TB2)

  • Official
  • 110 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
16 registers per request

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

Map

Registers
110 holding registers
Groups
6
Revision
1 · 2026-10-15
Added
()
File
maps/cummins/pcc1301.mbmap.json · 20 KB · history
SHA-256
f785572ecc3541953fb599444bff394366e1c66dd1a6c1533155119b34cea003
Manufacturer
cummins.com

Sources and notes

  • Modbus Register Mapping, Control · version A029X159 (Issue 26), 2020-06
    section 12, tables 27 (registers marked PCC1301) and 28 (PCC1301 limits, used instead of table 27's)

Source: Cummins, Modbus Register Mapping (Control), A029X159 Issue 26 (6-2020): tables 27 and 28

  • 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.
  • Table 28 gives the PCC1301 its own limits and options for some registers (battle short input, voltage regulator calibration, voltage display adjust); those are used here.
  • 32 one-character text registers left out.
AreaAddressNameTypeAccessUnitScaleDescription
HR 4 uint16 RW
HR 9 uint16 R
HR 10 uint16 R
HR 11 uint16 R
HR 12 uint16 R
HR 13 uint16 R
HR 16 uint16 R
HR 17 uint16 R
HR 18 uint16 R V
HR 19 uint16 R V
HR 20 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 ×0.1
HR 27 uint16 R A ×0.1
HR 28 uint16 R A ×0.1
HR 29 uint16 R A ×0.1
HR 40 uint16 R kVA
HR 41 uint16 R kVA
HR 42 uint16 R kVA
HR 43 uint16 R kVA
HR 44 uint16 R % ×0.1
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 64 uint16 R °C ×0.1
HR 68 uint16 R rpm
HR 69 uint16 R
HR 70 uint16 R s
HR 71 uint16 R s
HR 210 int16 R rpm ×0.01
HR 211 int16 R V ×0.01
HR 300 uint16 RW
HR 301 uint16 RW
HR 302 uint16 RW
HR 3000 uint16 RW V
HR 3001 uint16 RW
HR 3003 uint16 RW
HR 3004 uint16 RW
HR 3005 uint16 RW
HR 3006 uint16 RW s
HR 3007 uint16 RW s
HR 3008 uint16 RW
HR 3009 uint16 RW s
HR 3010 uint16 RW s
HR 3011 uint16 RW
HR 3012 uint16 RW
HR 3013 uint16 RW
HR 3014 int16 RW Hz ×0.1
HR 3015 uint16 RW %V/Hz ×0.1
HR 3016 uint16 RW %
HR 3017 uint16 RW %
HR 3018 uint16 RW %
HR 3019 uint16 RW
HR 3020 uint16 RW % ×0.1
HR 3021 uint16 RW % ×0.1
HR 3022 uint16 RW %/s ×0.1
HR 3023 uint16 RW % ×0.1
HR 3024 uint16 RW %
HR 3025 uint16 RW %
HR 3026 uint16 RW %
HR 3027 uint16 RW % ×0.1
HR 3028 uint16 RW %
HR 3029 uint16 RW s
HR 3030 uint16 RW rpm
HR 3031 uint16 RW %
HR 3032 uint16 RW %
HR 3065 uint16 RW
HR 3066 uint16 RW
HR 3067 uint16 RW
HR 3068 uint16 RW
HR 3069 uint16 RW % ×0.01
HR 3070 uint16 RW % ×0.01
HR 3071 int16 RW Hz ×0.1
HR 3072 uint16 RW % ×0.01
HR 3073 uint16 RW % ×0.01
HR 3074 uint16 RW % ×0.01
HR 3075 uint16 RW % ×0.01
HR 3076 uint16 RW % ×0.01
HR 3077 uint16 RW % ×0.01
HR 3078 uint16 RW % ×0.001
HR 3079 uint16 RW % ×0.001
HR 3081 uint16 RW % ×0.001
HR 3082 uint16 RW % ×0.001
HR 3083 uint16 RW % ×0.001
HR 3084 uint16 RW
HR 3085 uint16 RW
HR 3086 uint16 RW
HR 3087 uint16 RW
HR 3088 uint16 RW
HR 3089 uint16 RW
HR 3090 uint16 RW
HR 3719 uint16 R
HR 3722 uint16 R
HR 3723 uint16 R
HR 3724 uint16 R

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