identify serial port device on Mac

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Mono

C++

C#

.NET

I am developing one application to Mac it requires a serial port communication I am using Qt C++ and C# mono framework are using to develop.

I used COM1, COM2 etc to identify com port in windows what is the equivalent in Mac. Itried some unix name "/dev/ttyS0", "/dev/ttyS1", "/dev/ttyUSB0", "/dev/ttyUSB1" but it didn't connected to the device

What is the equivalent COM1 in Mac for creating serial port to communicate.