Initial attempt at answer, and probably wrong
When first answered picked on the port names, thinking physical serial ports were in use.
Port names such as /tmp/ttyS1
or /dev/ttys001
are used for serial ports under Linux.
Under Windows serial port names are of form COM<number>. E.g. COM2
.
The SuperUser question How to view serial COM ports but not through Device Manager on how to list COM port numbers under Windows, in addition to the Device Manager.
SimulIDE virtual serial ports
On reading the question again, realised that SimulIDE is actually a simulator.
SimulIDE Knowledge Base – SERIAL MONITOR – contains:
Right-Click on the Component and select “Open Serial Monitor”.
If there are more than one UART you will see a list of available Uarts.
Choose one to open the Serial Monitor widget for that Uart
On the above web page, the virtual serial port name is shown as Uart1
.