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  3. Optidrive E3

Altus Optidrive E3 Modbus register map

Also covers ODE-3

Variable speed drive: control word, speed reference, ramp time, status and trip code, output frequency, current, torque and power, inputs, DC bus and temperatures

  • Official
  • 51 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10

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
1
Serial
115200 8N1 · 115200 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1

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

Map

Registers
51 holding registers
Groups
3
Revision
1 · 2026-11-10
Added
()
File
maps/altus/optidrive-e3.mbmap.json · 10 KB · history
SHA-256
92bbfed5ff4814f76d00567c2ccb1585c9083ec744978cdfb51ac98c4cd07bbf
Manufacturer
altus.com.br

Sources and notes

  • Optidrive E3 Manual do usuário (ODE-3 Guia do usuário) · version Revisão 1.04, 2021
    linked in issue #118; chapter 8 (Comunicações Modbus RTU), section 8.4 register map

Source: Optidrive E3 Manual do usuário (ODE-3 Guia do usuário), Revisão 1.04

  • Modbus RTU on the RJ45 connector (pin 7 RS485-, pin 8 RS485+; do not plug into Ethernet). FC03, FC06 and FC16 (registers 1 to 4 only). Registers are numbered from 1, as in the guide: masters that start at 0 must subtract 1.
  • Factory settings: 115200 bit/s, 8 data bits, no parity, 1 stop bit. The address is the first index of parameter P-36 (0 to 63, default 1); the baud rate is the second index (9.6 to 115.2 kbit/s). P-36 also holds the communication-loss timeout.
  • Registers 1 to 4 control the drive only when P-12 is 3 or 4 (Modbus control); register 4 needs P-12 = 4. Registers 6 to 24 and 2001 to 2016 are read-only. Parameter P-04 to P-60 is register 128 + the parameter number (P-15 is register 143); none is listed here.
  • The text of register 6 says the low byte is the fault code and the high byte the drive state, but the status-word table (section 8.4.1) puts the fault code in the high byte, as the Optidrive ECO does. The map follows the status-word table: bits 0, 1, 2 and 6 for running, tripped, standby and ready, and the fault code in bits 8 to 15.
  • Written from the user guide (published for the ODE-3 drives, called Optidrive E3 on its cover); this map has not been tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 1 bool bit 0 RW 1 = run, 0 = stop
HR 1 bool bit 1 RW 1 = stop with the second deceleration ramp
HR 1 bool bit 2 RW 1 = reset an active trip; set back to 0 after the fault clears
HR 1 bool bit 3 RW 1 = coast to stop
HR 1 bool bit 8 RW 1 = relay closed, 0 = open
HR 1 bool bit 9 RW Bit 9 of the control word; the guide says 1 = off, 0 = on without saying what SD is
HR 2 uint16 RW Hz ×0.1 Setpoint in Hz with one decimal; the guide gives 0 to 5000 raw
HR 3 uint16 RW % ×0.0244140625 0 to 4096 = 0 to 100 %
HR 4 uint16 RW s ×0.01 Acceleration and deceleration time, 0 to 60000 raw; used when fieldbus ramp control is enabled
HR 6 bool bit 0 R
HR 6 bool bit 1 R
HR 6 bool bit 2 R
HR 6 bool bit 6 R Needs no trip, hardware enable present and no network loss
HR 6 uint16 bits 8–15 R Number of the active fault; see the fault list in the guide
HR 7 uint16 R Hz ×0.1
HR 8 uint16 R A ×0.1
HR 11 uint16 R Bit 0 = digital input 1, and so on
HR 20 uint16 R % ×0.1
HR 21 uint16 R % ×0.1
HR 22 uint16 R Hz ×0.1 Internal frequency setpoint, Hz x 10
HR 23 uint16 R V
HR 24 int16 R °C
HR 2001 uint16 R
HR 2001 bool bit 0 R
HR 2001 bool bit 1 R
HR 2001 bool bit 2 R
HR 2001 bool bit 3 R
HR 2001 bool bit 4 R
HR 2001 bool bit 6 R
HR 2001 bool bit 7 R
HR 2001 bool bit 8 R Motor current above P-08
HR 2001 bool bit 9 R
HR 2001 bool bit 10 R
HR 2001 bool bit 11 R
HR 2001 bool bit 12 R
HR 2001 bool bit 13 R
HR 2002 int16 R Hz ×0.1
HR 2003 uint16 R A ×0.1
HR 2004 uint16 R kW ×0.1
HR 2005 uint16 R Bits: 0-3 digital inputs 1 to 4, 6 and 7 IP66 forward and reverse switches, 8 digital output, 9 relay, 12 and 13 analog input signal lost
HR 2006 int16 R % ×0.1 0.0 to +/-200.0 %
HR 2007 uint16 R V
HR 2008 int16 R °C
HR 2009 uint16 R 0 to 4096
HR 2010 uint16 R 0 to 4096
HR 2011 uint16 R % ×0.1
HR 2012 uint16 R % ×0.1
HR 2013 int16 R °C
HR 2014 uint16 R V
HR 2015 uint16 R 0 to 4096
HR 2016 uint16 R

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