Whether the interface is UART or USB (hardware setting is different when out of factory, please
don¡t misuse), on PCB board the connector is uniform. For split type, 5-pin connector (J1) with 2.0mm
space between; for integral type, 4-pin connector (J1) with 1.27mm space between.
Unless required specially by user, the connecting cable with upper computer is 150mm.