UPS connection to all Xserve Raids

Now you can solve my next problem:

So there is a port on the back of the Xserve Raid units for a serial connection to a UPS. I don't have nearly as many UPS units as I do Xserve Raids. I want to somehow be able to split/multiply the serial signal coming out of the UPS - know of any hardware that will do this? Additionally, I see no indicators in the raid software that speaks to UPS - how would I know if the connection is working?