# Standalone USB Carrier Board

Source: https://forum.modalai.com/topic/2179/standalone-usb-carrier-board
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2023-05-21 17:49:54 UTC by Brandon Wightman
Replies: 1 · Views: 550

## Brandon Wightman · 2023-05-21 17:49:54 UTC

Hello I was hoping to utilize the serial port on the Standalone USB Carrier Board for the microhard, however neither of mine have a connector there. Is the board still ran to run serial to that locations and what is the pin out order?

Thank you for your assistance.

## Reply by Vinny (ModalAI staff) · 2023-05-21 22:17:45 UTC

Hi @Brandon-Wightman 
Please review this diagram, and you can see the serial port is not a functional item in "standalone dongle mode", hence why it is DNI'd.
https://docs.modalai.com/microhard-usb-carrier/#block-diagram

If you are referring to the Microhard's UART port that we label "pDDL UART" here: https://docs.modalai.com/microhard-add-on-datasheet/#bottom-of-board
that is present in either standalone or Voxl configs. You are right, we neglected to post that pinout, since you would actually be the first person in almost 4 years since we launched that product to ask for it. Please clarify if that is what you are after, and we can update our tech docs to include that pinout.
However, we do not have Software for it, so you would be trail-blazing both HW and SW efforts here if you plan to develop it on your own.

Thanks!