A Mac to ImageWriter Printer cable should work. If not add a Null modem connector to the cable.

The Mac Printer cable comes in many flavors:

Old Mac DB 9 to DB 25,

Old Mac DB 9 to PC DB 9,

Old Mac DB 9 to Din 8,

Din 8 to DB 25,

Din 8 to DB 9,

and Din 8 to Din 8.

You need to see which one you will need.