Firmware Update

EM-482 stores two update files in its memory:

• User firmware – the file can be uploaded via the WEB-interface or downloaded from the server;
• Manufacturer firmware – the file is written by the Manufacturer and cannot be replaced. If the update fails (for example, due to power failure), this file is used for automatic recovery.

Any of these files can be retrieved from the EM-482 memory (to upload to another Product). Firmware can be updated from these files via the WEB-interface, or remotely by Modbus command.

Before you start

Data Safety

Update to a newer version in most cases retains the device configuration and Modbus settings, unless specifically warned so in the firmware description.

Power Supply

Ensure the device has a stable power supply during the update process. Do not power off the device while the update is in progress (usually 1 minute).

Recoverability

The update process faults (e.g. caused by power losses) are recoverable, by repeating the update until it is complete. The update file passes multi-stage check before the update starts. In case of file damage, the update can be completed from the factory default file.

Checking current version

Before updating, check your current firmware version to see if an update is necessary. You can find the version number:

• At the bottom of the Web Interface quick setup page, or on the Files page.
• By reading Modbus register 1.

Updating from the file can be done in the firmware update mode.

Getting the update file into EM-482

The update files can be written to the EM-482 memory in 2 ways:

1. Upload from the client device using WEB interface

   1.1 access the device using the browser (see Quick Start Guide); 1.2 open Files page;

   1.3 if another file has already been uploaded to EM-482, delete it by clicking the Delete button; 1.4 click the file selection button in the User firmware row; 1.5 select the update file, for example, EM-482-1-1-10.FUS in the window that opens; 1.6 click the Upload button in the User firmware line. 1.7 wait until the file upload finishes.

File check

After transferring the file, make sure you have uploaded the correct update file. The User firmware line should display the firmware header with the version number followed by Tested word.

2. Download from the server manually using MODBUS commands

   2.1 connect to the device via MODBUS and enter the setup mode (see Configuration via Modbus); 2.2 to verify the version of the downloaded update file, read the header line in registers 2030 - 2061; 2.3 check if the file download is in progress by reading register 2004; 2.4 to download the newer version from the cloud server, write the value 64893 into the control command register 120; 2.5 control the file download by reading registers 2004 - 2005; 2.6 after download completion, double-check the version of the downloaded file in registers 2030 - 2061.

Updating EM-482 from the file

EM-482 firmware can be updated from the file in its memory in 2 ways:

1. Update manually using WEB interface

   1.1 access the device using the browser (see Quick Start Guide); 1.2 open Files page;

   1.3 press the Program button in the row of the needed firmware update file to start the firmware update from it.

2. Update manually using MODBUS commands

   2.1 connect to the device via MODBUS and enter the setup mode (see Configuration via Modbus); 2.2 to verify the version of the downloaded update file, read the header line in registers 2030 - 2061; 2.3 to start the update from the file, write the value 65397 into the control command register 120.

Firmware update process

At the update command the device will automatically restart and enter update mode. Wait for the firmware update, the process may take 2 to 4 minutes. The device remains offline while in the update mode.

Troubleshooting & FAQ

Q: Will I lose my configuration or data during an update?

A: No, the firmware update to a newer version process is designed to preserve your device configuration, Modbus settings, and historical data. However, downgrading the firmware may revert the settings to factory defaults. In either case, backing up critical data is always recommended.

Q: The “Upload” button is not appearing in the Web Interface.

A: This can happen if some other file is already uploaded. Click the “Delete” button to free the memory.

Q: The firmware does not update automatically.

A: EM-482 does not support automatic updates. However, the firmware can be downloaded and updated from the server using two Modbus commands.

Q: The firmware update does not download at Modbus command.

A: This can happen if:

• The device is already running the latest firmware.
• The device does not have Internet access. Check your Wi-Fi and DNS settings.
• The update server is temporarily unreachable.

Q: The device does not see / does not recognize the uploaded file.

A: This can happen if the file upload was interrupted. Try again, try different browser or use the firmware download from the server.

Q: The update process seems to hang.

A: The update process typically takes 1 minute. If it takes significantly longer:

• Do not power off the device immediately.
• Check the PWR red signal, if it is continuously blinking for an error, or the device is unresponsive for over 5 minutes, try a manual restart. If the internal firmware is corrupted, the device should enter the emergency update mode automatically.

Q: Can I downgrade the firmware?

A: Yes, you can install an older firmware version by manually uploading the older firmware file and initiating the update. However, the device settings are not always retained and may be reverted to factory defaults after firmware downgrade.

Need Help?

For technical support and assistance:

• Email: support@overvis.com
• Support portal: www.overvis.com/support