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Carlo Gavazzi Modbus register maps

Updated 29 October 2026

12 Carlo Gavazzi models, 892 registers in all, each re-typed from Carlo Gavazzi’s own free documentation and checked against it.

• Energy meter

  Carlo Gavazzi EM100 / ET100 series (EM111, EM112, ET112)

  Single-phase EM111, EM112 energy meters and ET112 bidirectional meter with the S1 (RS485 Modbus RTU) port, protocol version 2 revision 14.

  48 registers · 18 writable · RTU
  Also known as: EM111, EM112, ET112, EM110, EM111-DIN, EM112-DIN, ET112-DIN, EM111DINAV81XS1X, EM112DINAV01XS1X, ET112DINAV01XS1X
• Energy meter (energy analyzer)

  Carlo Gavazzi EM210 (AV versions)

  EM210 three-phase energy analyzers, AV input versions with the RS485 Modbus RTU option, protocol version 4 revision 3 (newest variables need firmware A.5/A.6).

  64 registers · 15 writable · RTU
  Also known as: EM210, EM210-72D, EM210 AV
• Energy meter (energy analyzer)

  Carlo Gavazzi EM24-DIN (PFA, PFB and X models)

  EM24-DIN three-phase energy analyzers, PFA/PFB (MID) and X models with the RS485 Modbus RTU port (IS option), protocol version 4 revision 0.

  78 registers · 20 writable · RTU
  Also known as: EM24, EM24DIN, EM24DINAV93XISPFA, EM24DINAV93XISPFB, EM24DINAV93XISX, EM24DINAV53XISX, EM24DINAV23XISX, EM24 DIN AV9, EM24 DIN AV5
• Energy meter (energy analyzer)

  Carlo Gavazzi EM24-DIN Ethernet (E1)

  EM24-DIN energy analyzers with the E1 Ethernet (RJ45) Modbus TCP port, AV2 and AV5 inputs, X/PFA/PFB, protocol version 0 revision 1.3 (FW 1.0).

  89 registers · 29 writable · TCP
  Also known as: EM24 E1, EM24_E1, EM24DINAV23XE1X, EM24DINAV23XE1PFA, EM24DINAV23XE1PFB, EM24DINAV53XE1X, EM24DINAV53XE1PFA, EM24DINAV53XE1PFB
• Energy meter

  Carlo Gavazzi EM24-IS (SFA and SFB models)

  EM24-DIN AV2/AV5 IS SFA and SFB versions (identification codes 1696-1699), protocol revision 2.0.

  30 registers · 8 writable · RTU
  Also known as: EM24DINAV23XISSFA, EM24DINAV53XISSFA, EM24DINAV23XISSFB, EM24DINAV53XISSFB, EM24 SFA, EM24 SFB
• Energy meter

  Carlo Gavazzi EM270 / EM280 dual three-phase energy meters with TCD current sensors

  EM270 X (firmware r.b0+), EM270 W (r.C0+) and EM280 (r.E0+) on RS485 Modbus RTU, per communication protocol version 5 revision 1 (2018-01-29).

  56 registers · 7 writable · RTU
  Also known as: EM270, EM280, EM270 X, EM270 W, EM27072DMV53X2SX, EM28072DMV53X2SX
• Energy meter

  Carlo Gavazzi EM271 dual three-phase energy meter with TCD current sensors

  EM271 (firmware r.d0+, PF values from r.d2) on RS485 Modbus RTU, per communication protocol version 1 revision 2 (2018-01-29).

  56 registers · 7 writable · RTU
  Also known as: EM271, EM27172DMV53X2SX, EM27172DMV63X2SX
• Energy meter

  Carlo Gavazzi EM300 / ET300 series (EM330, EM340, ET330, ET340)

  EM330, EM331, EM340, EM341 energy meters and ET330/ET340 bidirectional meters with the S1 (RS485 Modbus RTU) port, protocol version 2 revision 17.

  83 registers · 23 writable · RTU
  Also known as: EM330, EM340, ET330, ET340, EM331, EM341, EM330-DIN, EM340-DIN, ET340-DIN, EM340DINAV23XS1X, EM340DINAV23XS1PFA, EM340DINAV23XS1PFB
• Energy meter

  Carlo Gavazzi EM530 / EM540 three-phase energy meters (RS485 Modbus)

  EM530 (CT-connected) and EM540 (direct-connected) with the S1 RS485 port, X and MID (PFA/PFB/PFC) versions, protocol document version 1.3.

  109 registers · 16 writable · RTU
  Also known as: EM530, EM540, EM530DINAV53XS1X, EM530DINAV53XS1PFA, EM530DINAV53XS1PFB, EM530DINAV53XS1PFC, EM540DINAV23XS1X, EM540DINAV23XS1PFA, EM540DINAV23XS1PFB, EM540DINAV23XS1PFC, EM500 series
• Power meter (power analyzer)

  Carlo Gavazzi WM15 power analyzer

  WM15-96 three-phase panel power analyzers with RS485 Modbus RTU (OS / OSPF / HOS versions), protocol version 1.2.

  119 registers · 22 writable · RTU
  Also known as: WM15, WM15-96, WM1596AV53XOSX, WM1596AV53XOSPFB, WM1596AV53HOSX
• Power meter (power analyzer)

  Carlo Gavazzi WM20 / WM30 / WM40 power analyzers

  WM20, WM30 and WM40 modular power analyzers with an RS485 (or Ethernet) Modbus module, protocol internal version rev. 4.0 (2018-03-28); WM30 = firmware letter X, WM40 = Y, WM20 = Z.

  79 registers · 12 writable · RTU/TCP
  Also known as: WM20, WM30, WM40, WM20-96, WM30-96, WM40-96
• Power meter (power analyzer)

  Carlo Gavazzi WM50 power analyzer with TCD branch channels

  WM50 base unit (firmware X0, i.e. all A and B versions) with an MC485232 or MCETH communication module, plus TCD branch channels, per communication protocol user version rev. 1.0.0 (2017-09-27).

  81 registers · 15 writable · RTU/TCP
  Also known as: WM50, WM50AV5, WM50-96, WM50 AV5

Carlo Gavazzi: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).