RX to TX.
TX for RX.
The surface-to-surface (GND to GND)
Turn the USB serial platelet function:
1 a simple serial communication.
2 the router or ADSL firmware upgrade.
3 GPS serial communication.
4 HDD firmware upgrade.
5 easy to use, RX TX from MCU;TX. Upon receiving the RX MCU in connected to ground.Without with MAX232 conversion.
6 the super terminal in use;Commonly used serial debugging tools.
7 all kinds of satellite machine for upgrading.
Such as...Universal USB serial small plate