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Wiring the Polar Gateway to an APM303 generator controller

This guide will show you how to connect the Polar Monitoring Gateway to the APM303 controller. It will also take you through how to setup and change the parameters required on the device 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 APM303 Serial Parameters

APM Connection Setup

APM303 Wiring Diagram
1. Connect power to the Gateway.
Power Polar Gateway

Connect the gateway to a 12-24 V DC power supply. Connect the positive wire to the positive outlet and the negative wire to the negative outlet.

2. Connect RS-485
Polar Gateway RS-485
APM303 RS-485

Connect the Modbus 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 power to make some configuration changes for your Polar Portal. 

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

Serial Communication Setup

Name Description Parameter Default Required 
SpeedBaud rateM011 = 96001 = 9600 
Stop bitStop bitM021 = 1 stop bit1 = 1 stop bit
Parity ParityM031= no1 = no
AddressSlave ID, Unit IDM0451
6. Click to button on the right to setup your device on the PolarPortal…
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