No, all you need connected to just read the serial output is the Rx and ground, to then write to the serial port you will also need Tx connected and in addition to that you will need to connect the reset line only if you are uploading new firmware.
No, all you need connected to just read the serial output is the Rx and ground, to then write to the serial port you will also need Tx connected and in addition to that you will need to connect the reset line only if you are uploading new firmware.