This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Get an "Apple IIc to ImageWriter I" cable. It has a DIN-5 plug on one end and a standard Dsub-25 plug on the other with the correct line swapping for NULL modem. Depending upon whether your PC connection is to a 25-pin or 9- pin port and whether or not an extension cable is used, you may also need a Dsub-25 to Dsub-9 cable and/or a Dsub-25 gender changer. (The latter are standard items at many computer stuff stores.) By: David Empson