Thorlabs ERM200-Series ER Meter - Firmware Changelog
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This firmware is a device internal program for ERM200, ERM210, ERM220 ER Meter benchtop devices. 

Installation Instruction
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In order to update the ERM2xx firmware, the firmware image file extension *.dfu) and the Thorlabs Optical Power Monitor are required.
Thorlabs Optical Power Monitor enables the user to upload a firmware image to the ERM2xx. You will find it installed to your computer after downloading and installing the Thorlabs Power Meter Software package from our web site. There (tab "Firmware") the up-to-date firmware image can be found as well. Please download it and remember the location on your computer where you saved it to.

1. Switch on the ERM2xx and connect it with the supplied USB cable to the computer with Thorlabs Power Meter Software package installed. The computer recognizes the connected device and installs the required driver software.

2. Start the "Thorlabs Optical Power Monitor" from Startmenu > All Programs > Thorlabs > Power Meter
   Optical Power Monitor > Thorlabs Optical Power Monitor

3. In the main window select the tab "Help". Then click under "Options" > Tools > 
   Update > Firmware Update Tool

4. Click Browse to select the downloaded *.dfu file, then Select and Next > to
   continue.

5. In the Select Target Device the ERM2xx should be listed. Select the ERM2xx and
   click Start.

6. The Optical Power Monitor switches the ERM2xx to DFU upload mode and begins to transfer
   the firmware image. The progress can be observed at the software and at
   the ERM2xx's screen. Do NOT interrupt the process, this may cause your ERM2xx
   to become inoperable!

7. When the transfer has completed click Finish. The ERM2xx reboots with the new firmware.
NOTE: DO NOT INTERRUPT THE FIRMWARE UPLOAD PROCESS. This may cause your ERM2xx to become inoperable!


Changelog
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Aug.08.2025
Backpanel:  V 1.0.1
- BUGFIX: correction for power value in Watt, on SCPI interface.

Feb.22.2021 Release V1.0.0