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ABB M2M Basic Modbus register map

Three-phase energy and power quality meter with RS485 Modbus RTU: three data banks (32-bit integers, floats and 16-bit values)

  • Official
  • 208 registers
  • Modbus RTU
  • Revision 3 · 2026-10-18

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.

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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
0-based

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

Map

Registers
208 holding registers
Groups
3
Revision
3 · 2026-10-18
Added
()
File
maps/abb/m2m-basic.mbmap.json · 32 KB · history
SHA-256
42e2a5033c194d121512b2e42dedd918925ab29e6835cf815304707aa2abc5c7
Manufacturer
abb.com

Sources and notes

  • M2M Basic - Communication Protocol · version V1.0
    document 2CSG445012D0201, memory maps of section 2.2.3

Source: ABB, "M2M Basic - Communication Protocol", Technical specification V1.0, 2CSG445012D0201

  • Only function code 03 (read holding registers) is supported, up to 125 registers per request. Slave address 1 to 247; baud rate 4800 to 38400, 8 data bits, 1 or 2 stop bits, even, odd or no parity (set on the instrument).
  • The same measurements appear in three banks: scaled 32-bit integers from 4096, IEEE 754 floats from 12288 (no scaling needed) and 16-bit values from 80/100 expressed as a fraction of the rated value (16384 = rated value). Use the float bank when possible.
  • The manual does not state the word order; values are read with the most significant word first.
  • Energy values are integers holding the energy x 100 (Wh x 100, varh x 100 and so on), so the map scales them by 0.01.
  • In the 16-bit bank the manual marks the formats with an asterisk it does not explain; the rated values come from the CT, VT and nominal power registers 80 to 88.
  • Requesting registers past the end of the map returns zeros; starting at an address that is not listed returns exception 02.
AreaAddressNameTypeAccessUnitScaleDescription
HR 80 uint16 R
HR 81 uint16 R Number of decimal places: 0, 1, 2 or 3
HR 82 uint16 R
HR 83 uint16 R
HR 84 uint16 R Number of decimal places: 0, 1, 2 or 3
HR 85 uint16 R
HR 86 uint16 R
HR 87 uint16 R Number of decimal places: 0, 1, 2 or 3
HR 88 uint16 R
HR 100 uint16 R 16384 = rated value
HR 101 uint16 R 16384 = rated value
HR 102 uint16 R 16384 = rated value
HR 103 uint16 R 16384 = rated value
HR 104 uint16 R 16384 = rated value
HR 105 uint16 R 16384 = rated value
HR 106 uint16 R 16384 = rated value
HR 107 uint16 R 16384 = rated value
HR 108 uint16 R 16384 = rated value
HR 109 uint16 R 16384 = rated value
HR 110 int16 R 16384 = rated value
HR 111 int16 R 16384 = rated value
HR 112 int16 R 16384 = rated value
HR 113 int16 R 16384 = rated value
HR 114 int16 R 16384 = rated value
HR 115 int16 R 16384 = rated value
HR 116 int16 R 16384 = rated value
HR 117 int16 R 16384 = rated value
HR 118 uint16 R 16384 = rated value
HR 119 uint16 R 16384 = rated value
HR 120 uint16 R 16384 = rated value
HR 121 uint16 R 16384 = rated value
HR 122 int16 R 16384 = rated value
HR 123 int16 R 16384 = rated value
HR 124 int16 R 16384 = rated value
HR 125 int16 R 16384 = rated value
HR 126 uint16 R Hz ×0.006103515625
HR 127 uint16 R MWh
HR 128 uint16 R kWh
HR 129 uint16 R Wh
HR 130 uint16 R Mvarh
HR 131 uint16 R kvarh
HR 132 uint16 R varh
HR 133 uint16 R MWh
HR 134 uint16 R kWh
HR 135 uint16 R Wh
HR 136 uint16 R Mvarh
HR 137 uint16 R kvarh
HR 138 uint16 R varh
HR 139 uint16 R ° ×0.02197265625
HR 140 uint16 R ° ×0.02197265625
HR 141 uint16 R ° ×0.02197265625
HR 142 uint16 R ° ×0.02197265625
HR 143 uint16 R 16384 = rated value
HR 144 uint16 R 16384 = rated value
HR 145 uint16 R 16384 = rated value
HR 146 int16 R 16384 = rated value
HR 147 int16 R 16384 = rated value
HR 148 uint16 R 16384 = rated value
HR 149 uint16 R
HR 150 uint16 R
HR 151 uint16 R
HR 152 uint16 R
HR 153 uint16 R
HR 154 uint16 R
HR 155 int16 R 16384 = rated value
HR 156 int16 R 16384 = rated value
HR 157 int16 R 16384 = rated value
HR 158 int16 R 16384 = rated value
HR 159 uint16 R 16384 = rated value
HR 160 uint16 R 16384 = rated value
HR 161 uint16 R 16384 = rated value
HR 162 uint16 R 16384 = rated value
HR 163 uint16 R 16384 = rated value
HR 164 uint16 R 16384 = rated value
HR 165 uint16 R MVAh
HR 166 uint16 R kVAh
HR 167 uint16 R VAh
HR 168 uint16 R 16384 = rated value
HR 169 uint16 R 16384 = rated value
HR 170 uint16 R 16384 = rated value
HR 4096 uint32 ABCD R V
HR 4098 uint32 ABCD R V
HR 4100 uint32 ABCD R V
HR 4102 uint32 ABCD R V
HR 4104 uint32 ABCD R V
HR 4106 uint32 ABCD R V
HR 4108 uint32 ABCD R V
HR 4110 uint32 ABCD R A ×0.001
HR 4112 uint32 ABCD R A ×0.001
HR 4114 uint32 ABCD R A ×0.001
HR 4116 uint32 ABCD R A ×0.001
HR 4118 int32 ABCD R ×0.001
HR 4120 int32 ABCD R ×0.001
HR 4122 int32 ABCD R ×0.001
HR 4124 int32 ABCD R ×0.001
HR 4126 int32 ABCD R ×0.001
HR 4128 int32 ABCD R ×0.001
HR 4130 int32 ABCD R ×0.001
HR 4132 int32 ABCD R ×0.001
HR 4134 uint32 ABCD R VA

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