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Schneider Electric Modbus register maps

Updated 28 October 2026

4 Schneider Electric models, 247 registers in all, each re-typed from Schneider Electric’s own free documentation and checked against it.

• Variable frequency drive (HVAC fans and pumps)

  Schneider Electric Altivar 212 (embedded Modbus RTU)

  ATV212H (IP21) and ATV212W (IP55) drives on the built-in Modbus RTU ports (RJ45 and open-style terminal), per Modbus manual S1A53844.

  55 registers · 25 writable · RTU
  Also known as: ATV212, Altivar 212, ATV212H, ATV212W, ATV212HU15N4, ATV212WD11N4
• Variable frequency drive

  Schneider Electric Altivar Machine ATV320 (embedded Modbus RTU)

  ATV320 Book (ATV320...B) and Compact (ATV320...C) drives on the built-in RJ45 Modbus serial port; register map per Communication Parameters file NVE41316 V3.5.

  68 registers · 31 writable · RTU
  Also known as: ATV320, Altivar 320, ATV320U, ATV320D, ATV320 Book, ATV320 Compact
• Variable frequency drive

  Schneider Electric Altivar Process ATV630 / ATV600 family (Modbus serial and Modbus TCP)

  Altivar Process ATV600 drives (ATV630, ATV650 and other ATV6x0 models) on the embedded RJ45 Modbus serial port or the embedded Ethernet Modbus TCP server; register map per Communication Parameters file EAV64332 V4.6.

  73 registers · 41 writable · RTU/TCP
  Also known as: ATV600, ATV630, ATV650, ATV660, ATV680, Altivar Process 600, ATV630U, ATV630D
• Solar inverter

  Schneider Electric Conext CL three-phase PV inverter 18/20/25 kVA

  Conext CL (IEC, PVSCL20E/25E) and Conext CL-NA (PVSCL18NA/25NA) three-phase string inverters, map revision 1.5.

  51 registers · 6 writable · RTU/TCP
  Also known as: Conext CL-NA, Conext CL-E, PVSCL18NA, PVSCL20E, PVSCL25E, PVSCL25NA

Schneider Electric: 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).