The thingSoC Digital Programming Connector (DPC) is backward compatible with the industry standard six (6) pin "FTDI" pinout USB to Serial Adapter pinout. However, the thingSoC Digital Programming Connector (DPC) includes two(2) extra pins (RTS & DEBUG) for extended device programming, such as "NodeMCU types" which use the RTS signal as a programming Enable, and the DTR signal as a programming Reset.
thingSoC USBUART3 Pinout Diagram :