Three controllers in a PC

<P style="MARGIN: 0px">Hi. I have a problem when I connect two or more AX1500 controllers in a PC.The controllers are connected on three com ports (two of them are ports of a PCI card) and the PC recognize the controllers but I can't send anything to them because the PC go out,it doesn't run with the controllers connected.
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<P style="MARGIN: 0px">Thanks
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<P style="MARGIN: 0px">It is not clear from your questions whether you can ever talk to the controllers.
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<P style="MARGIN: 0px">If the PC can "recognize" the controller, (i.e. "controller found"), then communication is working at least through that initial phase and there is no reason that communication would no longer work later.
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<P style="MARGIN: 0px">If connecting the controller causes the the PC to fail, please give more details: it is failing when connecting? fails at boot? what kind of failure, etc ...

<P style="MARGIN: 0px">We have the following problem:when I connect a controller to the COMM1 port of the PC it works perfectly.But when I connect the controller in a PCI MULTI I/O card (Longshine) the PC doesn't work when I give the supply to the controller. What is the problem? Have I to make a special configuration for the I/O card?
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<P style="MARGIN: 0px">Thanks
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<P style="MARGIN: 0px">There is nothing in the data that is exchanged between the pc &amp; controller that could cause the PC to fail.
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<P style="MARGIN: 0px">Please email us a phone number to <A href="This email address is being protected from spambots. You need JavaScript enabled to view it." target=_blank>This email address is being protected from spambots. You need JavaScript enabled to view it. so that we can call you at to go over your strange problem.