Question about Advantech ADAM-4520 (ADAM-4520-D2) Serial Adapter

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Commport locks usining 4520 and 4060 to control turnstile

I have three duplicate setups with each PC connecting an Adams 4520 connected directly to the onboard RS232, linking with the Adams 4060. The lockup occurs mainly at night (but sometimes during the day) and blocks all access to the port. Error recieved is program already accessing port. The only solution we have found is to reboot. It does not occur all the time and may not effect all three setups at the same time.

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