Modbus to Nmea 2000 gateway flashing guide Connect the Modbus gateway to the Atmel AVR ISP via the 6 pin header labled PL2 on the Modbus gatew

The Pink Stripe on the Connector designates where pin one is located Connect the CAN Power source 12volt from the power supply

Open AVR Studio 5.1

Upon opening of AVR Studio 5.1 you will be greeted with these two screens After the program has loaded click “Tools” then “AVR Programming”

You will then see this screen

Select the tool you wish to use for programming your device, in this case we need to use the “AVRISP mkII” so make sure this is selected from the drop down menu.

Select the device you wish to use, in this case we are using the “Atmel AT90CAN64” so make sure this is selected from the drop down menu.

The interface we will to use is “ISP” (in system programming)

Then Click the Apply button.

After you have clicked Apply this window should now appear. Set the ISP Clock frequency to 125khz if not already set.

After the ISP Clock is set you when then need to click on fuses in the left hand menu

You shall then be greeted with this screen where we will need to change some values.

Check you have selected the required parameters then click the “Program” button

• Starting operation read registers
• Reading register EXTENDED…OK
• Reading register HIGH…OK
• Reading register LOW…OK
• Read register LOW…OK
• Read registers…OK

If everything went OK then this message should be output at the bottom of the AVR Programming window

After you have successfully set and programmed the fuses it is now the time to load the firmware onto the device. Now select the file to flash Click the memories tab

It will then open this dialogue. Select the latest version .hex file from the Modbus gateway folder and click “Open” Check you have selected the correct .hex file from the folder and that your settings are correct

You Will Need:

• USB to RS-485 Converter
• Programmed 3155
• Small Flat-Head Screwdriver
• NMEA Power
• QModMaster Installed on your PC

If you do not have QModMaster downloaded, it is in S:/Downloads/QModMaster → Copy the .zip file into a seperate folder on your desktop and unzip inside the folder, then look for the 'Application File'.

The USB to RS-485 should have the following Connections:

Connect the USB to RS-485 Converter to the 3155 screw in terminal blocks as shown, tighten with flat head screwdriver (not too hard).

Plug in USB to RS-485 Converter into your PC.

Go into “device Manager” and confirm what COM port the device is on (The device will be called: Silicon Labs CP201x USB to UART Bridge)

Power up the 3155 using the NMEA connector and 12V power supply

Open Up QModMaster

In 'Options' → Modbus RTU Select the following settings:

Select the Serial Port that was shown in Device Manager!!!

Select the Following Settings in QModMaster:

Modbus Mode: RTU Slave Address: 16 Scan Rate: 1000 Function Code: Read Input Registers (0x04) Start Address: 3 (Dec) Number of Registers: 1 Data Format: Hex

Click the 'Connect' Button:

Click the Scan Button

A 4 digit number should appear in the big white box below, it should keep changing value with each new scan.

If a Value is receive succesfully and keeps changing value then testing is completed