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Lovato DMED121 Electrical Meter

This guide will show you how to connect the Polar Monitoring Gateway to the Lovato DMED121 electricity meter. It will also take you through the setup and parameters required on the Lovato DMED 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 DMED121 Serial Parameters
 

Lovato DMED121 Connection Setup

Lovato DMED121 Wiring Diagram
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.
RS-485 Connection

Connect the Modbus cable to allow communication with the polar gateway device. Connect A+ to A and the B- to 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 DMED121.  

5. Configure DMED121 Serial Parameters
In order for the Gateway to correctly communicate with the Lovato DMED121 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

Serial Node Address

Serial Slave ID

P-20

1

1

Serial Speed

Baud Rate

P-21

9600

9600

Communication Protocol

Data Format

P-22

8bit – n

8bit – n

Stop Bits

Communication Stop Bits

P-23

1

1

Protocol

Communication Protocol

P-24

Modbus RTU

Modbus 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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