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IWR6843AOPEVM: Using breakaway UART

Part Number: IWR6843AOPEVM

Hello,

The IWR6843AOPEVM has two USB ports: one on the mission board (USB1) and one on the breakaway board (USB2). The user guide indicates that the sensor data can be sent to either of these, by setting S4 = ON (see below screenshot). However, when we set S4 = ON and connect the sensor via. USB2, there are no UARTS available - the UARTS are still available on USB1. Is there anything else that needs to be set?