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Lovato RGK900 Generator Controller

This guide will show you how to connect the Polar Gateway to Lovato RGK900 Generator Controller. It will also take you through how to set up the parameters required RGK900 drive to ensure communications to the Gateway.

Steps to follow:

  1. Connect power to the Gateway.
  2. Connect RS-485.
  3. Final checks.
  4. Power on the system.
  5. Configure the Lovato RGK900 Serial Parameters

Lovato RGK900 Connection Setup

RGK900 Wiring Diagram
Polar Gateway for RGK900
1. Connect power to the Gateway.
Power Polar Gateway

Wire the Polar Gateway to a 12-24 V DC power supply. Connect the positive wire to the positive terminal and the negative wire to the negative terminal.

2. Connect RS-485.
Polar Gateway RS-485
RGK900 Wiring Diagram Rs-485

Wire the RS-485 cable to allow communication with the Polar Gateway device. Connect A+ => A  and B- => B .

3. Final checks
Before you switch on the device make sure you have done everything correctly in the previous steps.
  • Make sure the power is OFF while doing the cable wiring.
  • Re-check if there are no short circuits.
  • Check if the power cables are not loosely wired to the Gateway.
  • Check if the power cables are not loosely wired to the Generator Controller.
  • Re-check the RS-485 twisted pair cables is correctly connected A+ => A  and B- => B.
4. Power on the system

Now you are ready to go, you can now switch on the Polar Gateway and the Lovato RGK900.  

5. Configure Lovato RGK900 Serial Parameters
In order for the Gateway to correctly communicate with the Lovato RGK900 controller, there will need to be some changes made to the communication parameters. 

Note: It is critical to change the default settings to reflect the table below.

Serial Communication Setup


Name Description Parameter Default Required 
Communication Address Serial node address/Unit ID P20.n.011 1 
Serial speed Baud rate P20.n.02 96009600
Data FormatData formatP20.n.038 bit – n8 bit – n
Stop bitsStop bitsP20.n.0411
Protocol Communication protocol P20.n.05Modbus RTUModbus RTU

You may now sign in to the Polar Portal to monitor the device remotely, the button on the right will take you through a setup process.

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