If I have a device connected to serial port RS-232 on my computer and an application that is communicating with it. How secure is this? Can another application communicate with the device at the same time or is is just possible for one application?
And if my application isn't running, can another application communicate with the device? If so, how can I protect other applications to not communicate with the device? Is there any security settings in Windows for this?
I can not change the behaviour of the device, and it has no password protection.