# USB to UART Driver **URL:** \ **Category:** emonTx\ **Created:** [4 December 2021 23:46 UTC](https://community.openenergymonitor.org/t/usb-to-uart-driver/19195 "2021-12-04T23:46:26Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![David\_Steketee](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/david_steketee/32/18915_2.png) [@David\_Steketee](https://community.openenergymonitor.org/u/David_Steketee)\ **Post date:** [4 December 2021 23:46 UTC](https://community.openenergymonitor.org/t/usb-to-uart-driver/19195/1 "2021-12-04T23:46:26Z")
The link to the USB to UART driver is broken on the firmware modification page ([Firmware Modification - Guide | OpenEnergyMonitor](https://guide.openenergymonitor.org/technical/compiling/)). Also, are there instructions on how to specify the upload port? I get an error when attempting to upload via VSCode: “Error: Please specify `upload_port` for environment or use global `--upload-port` option.” ---
**Author:** ![Robert.Wall](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/robert.wall/32/38246_2.png) [@Robert.Wall](https://community.openenergymonitor.org/u/Robert.Wall)\ **Post date:** [5 December 2021 10:38 UTC](https://community.openenergymonitor.org/t/usb-to-uart-driver/19195/2 "2021-12-05T10:38:34Z")
Please look at the “Learn” section and “Electricity Monitoring” → “Programmers”. You need to check which programmer you have - the drivers are different. I’m afraid I no longer use any M$ software, so I can’t help with VSCode. I recommend you use the Arduino IDE, full instructions for installing and using that are also in ‘Learn’. @Gwil: The errant link is: - [USB to UART adapter windows drivers](http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx) will need to be installed Can you (ideally) refer to ‘Learn’ instead, now that both SELabs & FTDI might be needed?