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MAC Address write Guide

MAC Address write overview​

The MAC address is stored in different memory address from the firmware area of the W55RP20-S2E.
Therefore, reflashing the W55RP20-S2E firmware will not erase the MAC address input if only the firmware area is overwritten.

WIZnet’s MAC address OUI is 00:08:DC:XX:XX:XX. If you need to use a different OUI, please use W55RP20-S2E FW version 1.1.2 or later, modify the MAC_OUI0, MAC_OUI1, and MAC_OUI2 defines in port/app/configuration/inc/ConfigData.h with your desired OUI, then build and download the new firmware before proceeding with the setup guide.

Required Hardware and Software​

Hardware​

  • Devices with W55RP20-S2E firmware downloaded
  • Cables (Ethernet / Serial)

Software​

How to write MAC Address​

There are two ways to write MAC Address

Using WIZMacTool​

Step 1: Connect UART1 of W55RP20-S2E to PC​

At this step, you will need a separate UART to USB module.

Step 2: Run WIZMacTool​

Run WIZMacTool and connect the COM port to which the W55RP20-S2E is connected.

Step 3: Check INPUT MAC​

After connecting the COM port of the W55RP20-S2E to WIZMacTool, reset the W55RP20-S2E and verify that "INPUT MAC" is displayed in WIZMacTool.

Step 4: Write MAC Address​

Set up WIZMacTool as shown in the picture, enter the MAC address you wish to input, and click Write.

If the MAC address is successfully written, the W55RP20-S2E will respond with the letter R and the MAC address you entered.


For convenience when entering consecutive MAC addresses, WIZMacTool increments the MAC address by 1 after clicking Write MAC.

Step 5: Done​

You can verify the changed MAC address by searching with the config-tool


or checking it via AT commands.


Using Serial Command​

Step 1: Connect UART1 of W55RP20-S2E to PC​

At this step, you will need a separate UART to USB module.

Step 2: Run serial program​

Open the COM port connected to the W55RP20-S2E using a serial monitor program. In this manual, we used an open-source tool named Hercules.

Step 3: Check INPUT MAC​

After the COM port of the W55RP20-S2E is opened in the serial program, reset the W55RP20-S2E and verify that "INPUT MAC" is displayed.

Step 4: Write MAC Address​

Send the character 'S' followed by the MAC address you wish to input. The W55RP20-S2E will respond with the character 'R' and the MAC address you sent, indicating that the MAC address has been successfully written.

Step 5: Done​

You can verify the changed MAC address by searching with the config-tool


or checking it via AT commands.