What is a ASM-SDLC adapter?

I was routing through my PC bits box today and found a card which I do not recognise.

It has CARD ASM-SDLC ADAPTER printed on it and the connecter looks like a 25-pin COM port.

So.. what is it? What is it for?
MemranAsked:
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XionNETConnect With a Mentor Commented:
An SLDC card is a dedicated RS-485 interface card which emulates the IBM Asynchronous Data Link Control bus. It combines the function of an SDL controller and DCA interface card. It can drive any RS-232 devices via RS-485 line, without any protocol concerns that normal RS-485 interface cards may have.
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MemranAuthor Commented:
Thanks ;)
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