Pulse transformers and serial data

Hi Group, I'm looking for a relatively inexpensive way to transmit information from one mains switching power supply to up to two other mains switching power supplies a few feet away. The data rate would be 1200 baud or less. The only catch is the common lines can differ by as much as 170V, depending on mode of operation. (The common line on each power supply is normally at about -170V with respect to earth ground) At first glance, this application screams for an infrared connection, but this has been discounted because of a stray wire or an object interfering with the signal. So, I have been looking at using pulse transformers to fully isolate the wired communications connector from the -170V. I'll be sending and receiving information through the pulse transformers using Atmel, ATTiny2313 microcontrollers. Several companies (Tamura, C&D technologies, etc.) make pulse transformers. The issue I'm running into is that I have no idea how to drive a pulse transformer or how to receive data from a pulse transformer. Does anyone have any thoughts on this? (Application notes where are you?) Matt Meerian