Sync versus Async Comms

i have the following problem:
the computer we are building supports async comms (our comm port has 9 pins) but the source sending data to us are sync comms (their comm port has 10 pins).

pls advise how we can get around this problem without changing to a sync comm card, or is there no other alternative but to change the comm card?

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The number of pins is not significant here.  The protocol or data format IS.

There is a basic difference between asynchronous and synchrouous serial protocols and your PC comm port is designed for async.  It will not work with sync.  You need to get an add-in card that has a serial chip on it that is designed to handle the particular format of data coming from the sync source.

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