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« opening more than 4 COM ports at the same time »
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Re: opening more than 4 COM ports at the same time
« Reply #4 on: Jan 9th, 2017, 12:14pm »
Thank you for the suggestion. It is of course possible to close and open the ports one by one , but some of the devices transmit the data asynchronously and there is a risk of loosing the data. Not all of them can respond to messages. It was a question rather to clarify if I was doing some mistake or if the problem was in some limits that I was not aware of. The answer was very fast so Thanks again.
It was a question rather to clarify if I was doing some mistake or if the problem was in some limits that I was not aware of.
I am confident that it should be possible to overcome the limit quite easily. Basically the trick will be to re-use the same 'handle' for more than one serial port, so for example if each handle is shared between two ports, it would raise the limit to 8 simultaneously-open ports.
One approach, which seems to work, is to provide a 'swap port' function that switches the given handle to an alternative port. A slight complication is that it's not straightforward to pass a handle as a parameter in Liberty BASIC (handles are always global) so I've been experimenting with either passing the handle as a string, or passing the native Windows handle (which you can get with the HWND function in LBB).
Unfortunately I am busy with other projects at the moment so I haven't been able to give this as much attention as it deserves.
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