'RS-232' serial ports do not provide any hardware connected detection beyond handshake lines being in the correct state. Plugging and unplugging a serial cable does not affect the state of any software or drivers that is associated with the port. So for 'RS-232' ports there is no need to open/close the port because the cable has been connected/disconnected or the device at the far end of the cable has been turned on/off.

However, if you are using a USB/RS-232 device and it is the USB cable that is being plugged/unplugged, then you are in a whole different world and there may be nasty stuff going on that you have no control over. The OS's RS-232 drivers were not designed with the serial port hardware coming and going - the hardware was either on the mother or plugged in through a hardware buss so that just couldn't happen. As a result bad stuff can happen in the context of USB/RS-232 devices because they try to look like legacy serial ports to the OS, but don't behave like them. I wouldn't be surprised to see bad behaviour especially during connect and disconnect and that there may be no simple solution.

True laziness is hard work

In reply to Re: Win32::SerialPort ; close / open problem by GrandFather
in thread Win32::SerialPort ; close / open problem by philipMac

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