Pulse transformers and serial data

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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
www.geocities.com/matt6ft9