I managed to connect my Macintosh SE to one of my PCs today.
The PC is running Ubuntu 13.10 and I used a cable from MacLink, which I believe is a null modem cable. I have purchased a couple of copies of MacLink and the disks have been unuseable.
On the PC I installed minicom 2.6.2 which I found through the Ubuntu Software Center. It is a command line program, so you have to run it from a terminal window. I used:
minicom -s
which starts the program and lets you change the settings
The Macintosh SE is running OS 6.0.8 and ZTerm 0.9
I downloaded several files from MacGui and transferred them from my PC to my Mac SE. Once there I was able to unpack them with Stuffit Expander 4.0.1. I was also able to transfer a couple of text files from the Mac to the PC and open them.

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