Most USB to Serial adapters has a DB9 connector however some adapters has a screw terminal header instead, this applies to industrial adapters and converters in particular. Some have thumb screws for attaching the DB9 connector to a device while others have screw nuts for connecting devices. Other differences are that some adapters has a female DB9 port instead of a male DB9 serial port. However mostly the physical size of the USB to serial adapter is actually the least important feature, more importantly are the electrical features of the adapter. For example a one port adapter is much smaller than a four port adapter. So what is the main differences between these USB to serial adapters? The most obvious difference is the physical size of the adapters this is mostly due to the number of ports the particular adapter has. What are the differences between USB to Serial adapters?
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