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When adding my Digi Transport product with a single serial port in Linux RealPort, four tty devices are created.

This is due to the built in external serial ports and the internal serial ports on the USB bus which are used for the serial interfaces with the cellular radio.  In addition, there are"virtual" serial ports which can be used for support older protocols/conversions. (such as X.25).

The first tty port refers to the actual serial port on the Transport unit. 
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