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Lovato DMED301 Electricity Meter

This guide will show you how to wire the Polar Monitoring Gateway to the Lovato DMED301 electricity meter. It will also take you through how to setup the parameters required on the Lovato DMED301 to ensure communications to the Polar 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 DMED301 Serial Parameters
 

Lovato DMED301 Connection Setup

Lovato DMED301 Wiring Diagram
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
Lovato DMED301

Wire the RS-485 cable to allow communication with the Polar Gateway device. Connect A+ => A and the 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 Electricity Meter.
  • 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 DMED301.  

5. Configure DMED301 Serial Parameters
In order for the Gateway to correctly communicate with the Lovato DMED301 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

NameDescriptionParameterDefaultRequired
Communication AddressSerial Slave IDP8-0111
Transmission SpeedBaud RateP8-0296009600
Communication ProtocolData FormatP8-038bit – n8bit – n
Stop BitsCommunication Stop BitsP8-0411
ProtocolCommunication ProtocolP8-05Modbus 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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