Variable SerialPortKind`Const`

SerialPortKind: {
    Device: SerialPortKind;
    Looped: SerialPortKind;
    Paired: SerialPortKind;
    Scripted: SerialPortKind;
    Simulated: SerialPortKind;
} = ...

What is on the other end of a serial port.

ReadonlyDevice: SerialPortKind

The kernel's serial device, with a real line on the other end.
ReadonlyLooped: SerialPortKind

The port's own output, looped back to its input.
ReadonlyPaired: SerialPortKind

The other end of a null-modem pair.
ReadonlyScripted: SerialPortKind

A script of the writes a driver is expected to make.
ReadonlySimulated: SerialPortKind

A simulated device that answers each write.

Variable SerialPortKindConst