Reading Mil Std 1553B output

I have a marine navigation eqpt fitted with an output port (7 pins)
which I know has Mil Std 1553B output. I need to tap this output for
use on my computer. Is there any way of finding out what the data
output is at the port? Is there any way of reading this data and using
it with a computer?

 

[BobG]

Buy a 1553 interface card?

 

Can I connect the port to the rx pin of the 9 pin serial port and make
any sense? Are the 1553B interface cards standard or does it have to be
custom made depending on the equipment