The user guide only states to use one of the two micro USB ports on the DAPLINK. However, you can only connect over Serial USB if you switch to the other port not stated in the instructions. Can you explain why?

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The MAXDAP-TYPE-C Pico adaptor board has two USB Micro-B connectors. 
 -The top connector next to the push button is used for updating the firmware of the micro board. 
 -The left connector next to the “DEVICE” label is used for the serial connection between the MAXREFDES101# and the PC. 
 
 Both connectors will provide power to the MAXREFDES101#.

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The user guide only states to use one of the two micro USB ports on the DAPLINK. However, you can only connect over Serial USB if you switch to the other port not stated in the instructions. Can you explain why?