COM port is not working/working partially. When checking in Device Manager, the only parameter available to set is baud rate. The COM ports are called Fintek Communication Port.
C&T PC300 series (Windows 10 operating system)
The Fintek driver installed seems to disable the normal parameters and the settings needed.
Uninstall the Fintek serial COM ports via Device Manager. Let Windows reinstall the COM ports automatically with default drivers. The standard parameters will then be available in COM port properties in Device Manager.