Remote Shutdown

I have a UPS 3000 with a serial port and a server attached with APC PowerChute Business Edition to help manage the server. I also have 4 other servers that use this UPS, but only 1 serial port, how do I get the other servers to shutdown when the UPS is going down? APC Support has been no help at all. Are there any scripts that I can have that 1 server run before APC shuts it down?? Any advice would be appreciated.

Thanks,

Luke